< Назад | Содержимое | Далее >

‌ACCESSORIES & EQUIPMENT

Wiring Systems and Power Management - Diagnostic Information and Procedures - Volt

DIAGNOSTIC INFORMATION AND PROCEDURES

DTC B097B: POWER MODE START SWITCH CIRCUIT (1 OF 2)

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC B097B

Power Mode Start Switch Circuit

For symptom byte information refer to Symptom Byte List

Diagnostic Fault Information

Circuit/System Description

The vehicle ON/OFF switch has a single LED that indicate the vehicle power mode. When the vehicle is in the off mode, the LED is not illuminated. Pressing and holding the vehicle ON/OFF switch up to 10 s, without the brake pedal applied, will enter the Vehicle Service Mode and the blue LED will illuminate. With the vehicle OFF and the brake pedal applied, pressing the vehicle ON/OFF switch once, the vehicle will enter the Vehicle ON mode and the blue LED will illuminate.

The vehicle ON/OFF switch contains two individual switches that provides redundant switch inputs to both the body control module (BCM) and the keyless entry control module. The BCM supplies the vehicle ON/OFF switch a constant B+ signal. The BCM monitors this signal to determine if the switch is released or pressed.

When the vehicle ON/OFF switch is not pressed, voltage on the signal circuit is pulled down through two resistors in the switch. When the vehicle ON/OFF switch is pressed, voltage on the signal circuit is pulled down through only one resistor, changing the voltage seen at the BCM and indicating that the vehicle ON/OFF switch is pressed.

The keyless entry control module monitors voltage on the switch in the same manner as the BCM, but monitors

the s switch located in the vehicle ON/OFF switch. The keyless entry control module also controls the backup power for the ignition run relay through the control circuit by applying voltage to the ignition voltage circuit. This circuit is a pass-thru in the BCM and will energize the ignition circuit when the vehicle is in Service Mode, the vehicle is ON, or when a remote start is requested.

Conditions for Running the DTC Control module voltage is 9 - 16 V. Conditions for Setting the DTC B097B 00

The voltage seen at the BCM monitored switch does not match the voltage seen at the keyless entry

control module monitored switch.

The above condition exists for more than 1 s

B097B 02

The control module detects a short to ground in the vehicle ON/OFF switch signal circuit The above condition exists for more than 1 s

B097B 04

The control module detects an open in the vehicle ON/OFF switch signal circuit The above condition exists for more than 1 s

B097B 05

The control module detects an open in the vehicle ON/OFF switch signal circuit The above condition exists for more than 1 s

B097B 08

The control module detects a change in the ignition mode without observing a switch press The above condition occurs 4 consecutive times

B097B 61

The control module detects a continuously closed vehicle ON/OFF switch The above condition exists for more than 1 min

Action Taken When the DTC Sets

No action is taken.

Conditions for Clearing the DTC

A current DTC clears when the malfunction is no longer present.

A history DTC clears after 40 consecutive module ignition cycles without a repeat of the malfunction.

Reference Information

Schematic Reference

Power Distribution Schematics Power Moding Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Power Mode Description and Operation

Keyless Entry System Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Verify DTC B097B 61 is not set.

If DTC B097B 61 is set

Test or replace the S83 Vehicle On/Off Switch.

If DTC B097B 61 is not set

2. Refer to Circuit/System Testing.

Circuit/System Testing

1. Vehicle OFF and all vehicle systems OFF, disconnect the harness connector at the S83 Vehicle On/Off Switch. It may take up to 2 min for all vehicle systems to power down.

2. Test for less than 10 Ω between the ground circuit terminal 4 and ground.

If 10 Ω or greater

1. Test for less than 2 Ω in the ground circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, repair the open/high resistance in the ground connection.

If less than 10 Ω

3. Test for less than 10 Ω between the low reference circuit terminal 7 and ground.

If 10 Ω or greater

1. Test for less than 2 Ω in the ground circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, replace the K84 Keyless Entry Control Module.

If less than 10 Ω

4. Connect the S83 Vehicle On/Off Switch, Vehicle in Service Mode.

5. Disconnect the S83 Vehicle On/Off Switch.

6. Verify the scan tool K9 Body Control Module Push Button Ignition Switch Voltage parameter is greater than 11 V.

If 11 V or less

1. Connect the S83 Vehicle On/Off Switch.

2. Vehicle OFF, disconnect the X2 harness connector at the K9 Body Control Module and S83 Vehicle On/Off Switch.

3. Test for infinite resistance between the signal circuit terminal 6 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module.

If greater than 11 V

7. Install a 3 A fused jumper wire between the signal circuit terminal 6 and ground.

8. Verify the scan tool K9 Body Control Module Push Button Ignition Switch Voltage parameter is less than 1 V.

If 1 V or greater

1. Disconnect the harness connector at the K9 Body Control Module.

2. Test for less than 1 V between the signal circuit and ground.

If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V

3. Test for less than 2 Ω in signal circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, replace the K9 Body Control Module.

If less than 1 V

9. Connect the harness connector at the S83 Vehicle On/Off Switch.

10. Verify the scan tool K9 Body Control Module Push Button Ignition Switch Voltage parameter is 8 - 10 V, with the S83 Vehicle On/Off Switch released.

If not between 8 - 10 V

Test or replace the S83 Vehicle On/Off Switch.

If between 8 - 10 V

11. Verify the scan tool K9 Body Control Module Push Button Ignition Switch Voltage parameter is 4 - 7 V, with the S83 Vehicle On/Off Switch pressed.

If not between 4 - 7 V

Test or replace the S83 Vehicle On/Off Switch.

If between 4 - 7 V

12. Disconnect the X1 harness connector at the K84 Keyless Entry Control Module.

13. Test for infinite resistance between the signal circuit terminal 11 and ground.

If less than infinite resistance

Repair the short to ground on the circuit.

If infinite resistance

14. Vehicle in Service Mode.

15. Test for less than 1 V between the signal circuit terminal 11 and ground.

If 1 V or greater

Repair the short to voltage on the circuit.

If less than 1 V

16. Test for 4.5 - 5.5 k Ω between the signal circuit terminal 11 and the low reference circuit terminal 12, with the S83 Vehicle On/Off Switch released.

If not between 4.5 - 5.5 k Ω

1. Vehicle OFF, disconnect the harness connector at the S83 Vehicle On/Off Switch.

2. Test for less than 2 Ω in the signal circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, test or replace the S83 Vehicle On/Off Switch.

If between 4.5 - 5.5 k Ω

17. Test for 1 - 1.5 k Ω between the signal circuit terminal 11 and the low reference circuit terminal 12, with the S83 Vehicle On/Off Switch pressed.

If not between 1 - 1.5 k Ω

Test or replace the S83 Vehicle On/Off Switch.

If between 1 - 1.5 k Ω

18. Replace the K84 Keyless Entry Control Module.

Component Testing

Ignition Mode Switch Test

1. Vehicle OFF, disconnect the harness connector at the S83 Vehicle ON/OFF Switch.

2. Test for 4.5 - 5.5 k Ω between the terminal listed below with the S83 Vehicle ON/OFF Switch released: Signal terminal 6 and ground terminal 4

Signal terminal 3 and low reference terminal 7

If not between 4.5 - 5.5 k Ω

Replace the S83 Vehicle On/Off Switch.

If between 4.5 - 5.5 k Ω

3. Test for 1 - 1.5k Ω between the terminals listed below with the S83 Vehicle On/Off Switch pressed, : Signal terminal 6 and ground terminal 4

Signal terminal 3 and low reference terminal 7

If not between 1 - 1.5 k Ω

Replace the S83 Vehicle On/Off Switch.

If between 1 - 1.5 k Ω

4. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Ignition and Start Switch Replacement

Control Module References for the appropriate control module replacement, programming and setup.

DTC B097B: POWER MODE START SWITCH CIRCUIT (2 OF 2)

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC B097B

Power Mode Start Switch Circuit

For symptom byte information refer to Symptom Byte List

Diagnostic Fault Information

Circuit/System Description

The vehicle ON/OFF switch has a single LED that indicate the vehicle power mode. When the vehicle is in the off mode, the LED is not illuminated. Pressing and holding the vehicle ON/OFF switch up to 10 s, without the brake pedal applied, will enter the Vehicle Service Mode and the blue LED will illuminate. With the vehicle OFF and the brake pedal applied, pressing the vehicle ON/OFF switch once, the vehicle will enter the Vehicle ON mode and the blue LED will illuminate.

The vehicle ON/OFF switch contains two individual switches that provides redundant switch inputs to both the body control module (BCM) and the keyless entry control module. The BCM supplies the vehicle ON/OFF switch a constant B+ signal. The BCM monitors this signal to determine if the switch is released or pressed.

When the vehicle ON/OFF switch is not pressed, voltage on the signal circuit is pulled down through two

resistors in the switch. When the vehicle ON/OFF switch is pressed, voltage on the signal circuit is pulled down through only one resistor, changing the voltage seen at the BCM and indicating that the vehicle ON/OFF switch is pressed.

The keyless entry control module monitors voltage on the switch in the same manner as the BCM, but monitors the s switch located in the vehicle ON/OFF switch. The keyless entry control module also controls the backup power for the ignition run relay through the control circuit by applying voltage to the ignition voltage circuit.

This circuit is a pass-thru in the BCM and will energize the ignition circuit when the vehicle is in Service Mode, the vehicle is ON, or when a remote start is requested.

Conditions for Running the DTC Control module voltage is 9 - 16 V. Conditions for Setting the DTC B097B 00

The voltage seen at the BCM monitored switch does not match the voltage seen at the keyless entry

control module monitored switch.

The above condition exists for more than 1 s

B097B 02

The control module detects a short to ground in the vehicle ON/OFF switch signal circuit The above condition exists for more than 1 s

B097B 04

The control module detects an open in the vehicle ON/OFF switch signal circuit The above condition exists for more than 1 s

B097B 05

The control module detects an open in the vehicle ON/OFF switch signal circuit The above condition exists for more than 1 s

B097B 08

The control module detects a change in the ignition mode without observing a switch press The above condition occurs 4 consecutive times

B097B 61

The control module detects a continuously closed vehicle ON/OFF switch The above condition exists for more than 1 min

Action Taken When the DTC Sets

No action is taken.

Conditions for Clearing the DTC

A current DTC clears when the malfunction is no longer present.

A history DTC clears after 40 consecutive module ignition cycles without a repeat of the malfunction.

Reference Information

Schematic Reference

Power Distribution Schematics Power Moding Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Power Mode Description and Operation

Keyless Entry System Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Verify DTC B097B 61 is not set.

If DTC B097B 61 is set

Test or replace the S83 Vehicle On/Off Switch.

If DTC B097B 61 is not set

2. Refer to Circuit/System Testing.

Circuit/System Testing

1. Vehicle OFF and all vehicle systems OFF, disconnect the harness connector at the S83 Vehicle On/Off Switch. It may take up to 2 min for all vehicle systems to power down.

2. Test for less than 10 Ω between the ground circuit terminal 4 and ground.

If 10 Ω or greater

1. Test for less than 2 Ω in the ground circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, repair the open/high resistance in the ground connection.

If less than 10 Ω

3. Test for less than 10 Ω between the low reference circuit terminal 7 and ground.

If 10 Ω or greater

1. Test for less than 2 Ω in the ground circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, replace the K84 Keyless Entry Control Module.

If less than 10 Ω

4. Connect the S83 Vehicle On/Off Switch, Vehicle in Service Mode.

5. Disconnect the S83 Vehicle On/Off Switch.

6. Verify the scan tool K9 Body Control Module Push Button Ignition Switch Voltage parameter is greater than 11 V.

If 11 V or less

1. Connect the S83 Vehicle On/Off Switch.

2. Vehicle OFF, disconnect the X2 harness connector at the K9 Body Control Module and S83 Vehicle On/Off Switch.

3. Test for infinite resistance between the signal circuit terminal 6 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module.

If greater than 11 V

7. Install a 3 A fused jumper wire between the signal circuit terminal 6 and ground.

8. Verify the scan tool K9 Body Control Module Push Button Ignition Switch Voltage parameter is less than 1 V.

If 1 V or greater

1. Disconnect the harness connector at the K9 Body Control Module.

2. Test for less than 1 V between the signal circuit and ground.

If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V

3. Test for less than 2 Ω in signal circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, replace the K9 Body Control Module.

If less than 1 V

9. Verify the scan tool K84 Keyless Entry Control Module Push Button Ignition Switch Voltage parameter is greater than 11 V.

If 11 V or less

1. Connect the S83 Vehicle On/Off Switch.

2. Vehicle OFF, disconnect the X1 harness connector at the K84 Keyless Entry Control Module and S83 Vehicle On/Off Switch.

3. Test for infinite resistance between the signal circuit terminal 3 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K84 Keyless Entry Control Module.

If greater than 11 V

10. Install a 3 A fused jumper wire between the signal circuit terminal 3 and ground.

11. Verify the scan tool K84 Keyless Entry Control Module Push Button Ignition Switch Voltage parameter is less than 1 V.

If 1 V or greater

1. Disconnect the X1 harness connector at the K84 Keyless Entry Control Module.

2. Test for less than 1 V between the signal circuit and ground.

If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V

3. Test for less than 2 Ω in signal circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, replace the K84 Keyless Entry Control Module.

If less than 1 V

12. Test or replace the S83 Vehicle On/Off Switch

Component Testing

Ignition Mode Switch Test

1. Vehicle OFF, disconnect the harness connector at the S83 Vehicle ON/OFF Switch.

2. Test for 4.5 - 5.5 k Ω between the terminal listed below with the S83 Vehicle ON/OFF Switch released: Signal terminal 6 and ground terminal 4

Signal terminal 3 and low reference terminal 7

If not between 4.5 - 5.5 k Ω

Replace the S83 Vehicle On/Off Switch.

If between 4.5 - 5.5 k Ω

3. Test for 1 - 1.5k Ω between the terminals listed below with the S83 Vehicle On/Off Switch pressed, : Signal terminal 6 and ground terminal 4

Signal terminal 3 and low reference terminal 7

If not between 1 - 1.5 k Ω

Replace the S83 Vehicle On/Off Switch.

If between 1 - 1.5 k Ω

4. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Ignition and Start Switch Replacement

Control Module References for control module replacement, programming and setup.

DTC B097C: POWER MODE RUN/CRANK INDICATOR CIRCUIT SHORT TO GROUND

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC B097C 02

Power Mode Run/Crank Indicator Circuit Short to Ground

Diagnostic Fault Information

Circuit/System Description

The vehicle ON/OFF switch has a single LED that indicates the vehicle power mode. When the vehicle is in the OFF mode, the LED is not illuminated. Pressing and holding the vehicle ON/OFF switch up to 10 s, without the brake pedal applied, will enter the Vehicle Service Mode and the blue LED will illuminate. With the vehicle OFF and the brake pedal applied, pressing the vehicle ON/OFF switch once, the vehicle will enter the Vehicle ON mode and the blue LED will illuminate.

Conditions for Running the DTC Control module voltage is 9 - 16 V Conditions for Setting the DTC

The BCM detects a short to ground in the control circuit. The above condition exists for more than 1 min.

Action Taken When the DTC Sets

The BCM disables the control output.

Conditions for Clearing the DTC

A current DTC clears when the malfunction is no longer present.

A history DTC clears when the module power mode cycle counter reaches 40, without a repeat of the malfunction.

Reference Information Schematic Reference Power Moding Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Power Mode Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Verify the blue LED illuminates when the S83 Vehicle On/Off Switch is pressed and held up to 10 s, with the brake pedal released.

If the blue LED does not illuminate

Refer to Circuit/System Testing.

If the blue LED illuminates

2. All OK.

Circuit/System Testing

1. Vehicle OFF and all vehicle systems OFF, disconnect the harness connector at the S83 Vehicle On/Off Switch. It may take up to 2 min for all vehicle systems to power down.

2. Test for less than 10 Ω between the low reference circuit terminal 4 and ground.

If 10 Ω or greater

1. Vehicle OFF.

2. Test for less than 2 Ω in the ground circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, repair the open/high resistance in the ground connection.

If less than 10 Ω

3. Test for less than 1 V between the control circuit terminal 5 and ground.

If 1 V of greater

1. Vehicle OFF, disconnect the harness connector at the K9 Body Control Module, Vehicle in Service Mode.

2. Test for less than 1 V between the control circuit and ground.

If 1 V or greater, repair the short to voltage on the circuit.

If less than 1 V

4. Vehicle OFF, connect the harness connector at the S83 Vehicle On/Off Switch.

5. Vehicle in Service Mode, disconnect the harness connector at the S83 Vehicle On/Off Switch.

6. Verify a test lamp illuminates between the control circuit terminal 5 and ground.

If the test lamp does not illuminate

1. Vehicle OFF, disconnect the harness connector at the K9 Body Control Module.

2. Test for infinite resistance between the control circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance

3. Test for less than 2 Ω in the control circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, replace the K9 Body Control Module.

If the test lamp illuminates

7. Test or replace the S83 Vehicle On/Off Switch.

Component Testing

1. Vehicle OFF, disconnect the harness at the S83 Vehicle On/Off Switch.

2. Connect a jumper wire between the S83 Vehicle On/Off Switch terminal 4 and ground.

3. Connect a 3 A fused jumper wire between the S83 Vehicle On/Off Switch terminal 5 and B+.

4. Verify the blue LED illuminates.

If the LED does not illuminate

Replace the S83 Vehicle On/Off Switch.

If the LED illuminates

5. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Ignition and Start Switch Replacement

Control Module References for the body control module replacement, programming and setup.

DTC B1370: CONTROL MODULE IGNITION ON AND START CIRCUIT (INSTRUMENT CLUSTER)

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC B1370

Control Module Ignition On and Start Circuit

For symptom byte information refer to Symptom Byte List

Diagnostic Fault Information

Circuit/System Description

The vehicle power mode master is the body control module (BCM). The vehicle ON/OFF switch contains two individual switches that provides redundant switch inputs to both the body control module (BCM) and the keyless entry control module. The BCM monitors this signal to determine if the switch is released or pressed. When the vehicle ON/OFF switch is not pressed, voltage on the signal circuit is pulled down through two resistors in the switch. When the vehicle ON/OFF switch is pressed, voltage on the signal circuit is pulled down through only one resistor, changing the voltage seen at the BCM and indicating that the vehicle ON/OFF switch is pressed. The power mode master will activate relays and other direct outputs of the power mode master as needed according to the calculated power mode.

The keyless entry control module monitors voltage on the switch is the same manner as the BCM, but monitors the second switch located in the vehicle ON/OFF switch.

Conditions for Running the DTC

B1370 01

Vehicle ON.

B1370 06

Vehicle ON, or Vehicle in Service Mode.

Conditions for Setting the DTC

B1370 01

Ignition circuit is shorted to voltage.

B1370 06

Ignition circuit is open.

Ignition circuit is shorted to ground.

Action Taken When the DTC Sets

The Instrument Cluster still functions except the malfunction indicator light is always off.

Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists.

A history DTC will clear once 50 consecutive malfunction-free Vehicle On/Off cycles have occurred.

Reference Information

Schematic Reference Instrument Cluster Schematics Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Instrument Cluster Description and Operation Power Mode Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Verify that DTC B144B is not set.

If DTC B144B is set

Refer to Diagnostic Trouble Code (DTC) List - Vehicle .

If DTC B144B is not set

2. Refer to Circuit/System Testing.

Circuit/System Testing

1. Vehicle OFF, disconnect the harness connector at the P16 Instrument Cluster.

2. Verify that a test lamp does not illuminate between the ignition circuit terminal 8 and ground.

If the test lamp illuminates

Repair the short to voltage on the ignition circuit.

If the test lamp does not illuminate

3. Vehicle in Service Mode.

4. Verify that a test lamp illuminates between the ignition terminal 8 and ground.

If the test lamp does not illuminate and the Ignition fuse is good

1. Vehicle OFF, remove the test lamp.

2. Test for less than 2 Ω in the ignition circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, refer to Power Mode Mismatch .

If the test lamp does not illuminate and the Ignition fuse is open

1. Vehicle OFF, remove the test lamp.

2. Test for infinite resistance between the ignition circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the P16 Instrument Cluster.

If the test lamp illuminates

5. Replace the P16 Instrument Cluster.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for control module replacement, programming and setup.

DTC B144A: RUN POWER RELAY CIRCUIT

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC B144A

Run Power Relay Circuit

For symptom byte information refer to Symptom Byte List

Diagnostic Fault Information

Circuit/System Description

The body control module (BCM) feeds the ignition circuit by applying voltage when the vehicle is in Vehicle in Service Mode or Vehicle ON mode.

Conditions for Running the DTC

The system voltage is between 9 - 16 V.

The DTC can only run when the output is activated.

Conditions for Setting the DTC

The BCM detects a short to ground in the ignition circuit.

Action Taken When the DTC Sets

The module output driver will be shut down and not supply voltage to the ignition circuit.

Conditions for Clearing the DTC

The current DTC will clear when the module request for the output is removed or the malfunction is no longer present.

A history DTC clears when the module ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction.

Reference Information Schematic Reference HVAC Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Power Mode Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

1. Vehicle OFF, disconnect the X2 harness connector at the K33 HVAC control module.

2. Connect a test lamp between the ignition circuit terminal 9 and ground.

3. Verify the test lamp turns ON and OFF when cycling the S83 vehicle ON/OFF switch between Vehicle in Service Mode and Vehicle OFF.

If the test lamp is always OFF

1. Vehicle OFF, remove the test lamp.

2. Test for infinite resistance between the ignition circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance

3. Test for less than 2 Ω in the ignition circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, replace the K9 Body Control Module.

If the test lamp is always ON

1. Vehicle OFF, remove the test lamp.

2. Test for less than 1 V between the ignition circuit and ground.

If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module.

If the test lamp turns ON and OFF

4. Test or replace the K33 HVAC control module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for body control module and HVAC control module replacement, programming and setup.

DTC B144B: RUN/CRANK POWER RELAY CIRCUIT

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC B144B

Run/Crank Power Relay Circuit

For symptom byte information refer to Symptom Byte List

Diagnostic Fault Information

Circuit/System Description

The body control module (BCM) controls the ignition main relay through the control circuit by applying voltage to the ignition main relay coil control circuit. The ignition main relay is energized when the vehicle is in Service Mode, the vehicle is ON, or when a remote start is requested. This is part of the BCM's primary function in controlling the vehicle power mode.

The keyless entry control module controls the backup power for the ignition main relay through the control circuit by applying voltage to the ignition circuit. This circuit is a pass-thru in the BCM and will energize the ignition circuit when the vehicle is in Service Mode, the vehicle is ON, or when a remote start is requested.

Conditions for Running the DTC System voltage is greater than 9 V Conditions for Setting the DTC B144B 01

The ignition output is not active and a short to battery is detected 3 consecutive times on the ignition voltage

circuit

B144B 02 - BCM

A short to ground is detected on the ignition main relay coil control circuit

B144B 02 - Keyless Entry Control Module

The ignition output is active and a short to ground is detected 3 consecutive times on the ignition voltage circuit

B144B 04

The ignition output is not active and an open is detected 20 consecutive times on the ignition voltage circuit

Action Taken When the DTC Sets

B144B 01, B144B 04

No action is taken

B144B 02

The ignition relay is deactivated when the fault is set. After 100 ms, the ignition main relay will be activated. If the fault is still set, the relay will be deactivated. The ignition main relay will again be activated after 100 ms. If this also results in a fault, the ignition main relay will be deactivated until a new ignition request is received.

Conditions for Clearing the DTC

The current DTC will clear when the malfunction is no longer present and an ignition request is received. A history DTC will clear after 40 malfunction-free ignition cycles.

Diagnostic Aids

A short to voltage on the ignition main relay coil control will cause the engine to remain running after the vehicle mode is changed to OFF.

Reference Information Schematic Reference Power Moding Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Power Mode Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs

Relay Replacement (Attached to Wire Harness) Relay Replacement (Within an Electrical Center) Testing for Intermittent Conditions and Poor Connections

Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Vehicle in Service Mode.

2. Verify the KR73 Ignition Main Relay clicks ON and OFF when commanding the Run/Crank Relay On and Off with a scan tool.

If the KR73 Ignition Main Relay does not click ON and OFF

Refer to Circuit/System Testing.

If the KR73 Ignition Main Relay clicks ON and OFF

3. All OK.

Circuit/System Testing

1. Vehicle OFF, disconnect the X3 harness connector at the K9 Body Control Module.

2. Test for less than 1 V between the ignition circuit terminal 6 and ground.

If 1 V or greater

Repair the short to voltage on the circuit.

If less than 1 V

3. Vehicle in Service Mode.

4. Verify a test lamp illuminates between the ignition circuit terminal 6 and ground.

If the test lamp does not illuminate

1. Vehicle OFF, remove the test lamp.

2. Test for infinite resistance between the ignition circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance.

3. Test for less than 2 Ω in the ignition circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, replace the K84 Keyless Entry Control Module.

If the test lamp illuminates

5. Vehicle OFF, connect the X3 harness connector at the K9 Body Control Module.

6. Vehicle OFF and all vehicle systems OFF, disconnect the KR73 Ignition Main Relay. It may take up to 2 min for all vehicle systems to power down.

7. Test for less than 10 Ω between the ground circuit terminal 1 and ground.

If 10 Ω or greater

1. Vehicle OFF.

2. Test for less than 2 Ω in the ground circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, repair the open/high resistance in the ground connection.

If less than 10 Ω

8. Connect a test lamp between the control circuit terminal 2 and the ground circuit terminal 1.

9. Verify the test lamp turns ON and OFF when commanding the Run/Crank Relay On and Off with a scan tool.

If the test lamp is always OFF

1. Vehicle OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module.

2. Test for infinite resistance between the control circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance.

3. Test for less than 2 Ω in the control circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, replace the K9 Body Control Module.

If the test lamp is always ON

1. Vehicle OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module, Vehicle in Service Mode.

2. Test for less than 1 V between the control circuit and ground.

If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module.

If the test lamp turns ON and OFF

10. Test or replace the KR73 Ignition Main Relay.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for control module replacement, programming and setup.

DTC B1451: ACCESSORY POWER CIRCUIT

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC B1451

Accessory Power Circuit

For symptom byte information refer to Symptom Byte List

Diagnostic Fault Information

Circuit/System Description

The keyless entry control module provides backup controls for the ignition power circuit, through the control circuit, by applying voltage to the circuit. The ignition power circuit is energized when the vehicle power mode is in Vehicle ON or Vehicle in Service Mode.

Conditions for Running the DTC

B1451 01, B1451 04

Vehicle power mode is Vehicle OFF Module is awake

DTC B1451 not already set

System voltage between 6 and 16 V

B1451 02

Vehicle power mode is Vehicle ON or Vehicle in Service Mode Module is awake

The DTC is only run when the output is active DTC B1451 is not already set

System voltage between 6 and 16 V

Conditions for Setting the DTC

B1451 01

Ignition output is not active and a short to battery is detected 3 consecutive times.

B1451 02

Ignition output is active and a short to ground is detected 3 consecutive times.

B1451 04

Ignition output is not active and an open circuit is detected 20 consecutive times.

Action Taken When the DTC Sets

B1451 02

The ignition output is deactivated when a short to ground is detected. After 100 ms the output is activated again. This happens 3 times and then the output is deactivated until a new Vehicle ON or Vehicle in Service Mode request is received.

B1451 01, B1451 04

No action is taken.

Conditions for Clearing the DTC

The current DTC will clear when the malfunction is no longer present during a DTC check.

A history DTC clears when the module power mode cycle counter reaches the reset threshold of 40, without a repeat of the malfunction.

Diagnostic Aids

A short to voltage in the ignition control circuit will keep the vehicle modules awake, which can drain the vehicle's battery.

A short to ground in the extension of this circuit through the body control module can back feed to the keyless entry control module. Check for a short to ground on the ignition circuit on the other side of the ignition pass thru, in the body control module, before replacing the body control module.

Reference Information Schematic Reference Power Moding Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Power Mode Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Verify DTC U1814 is not set.

If DTC U1814 is set

Refer to Diagnostic Trouble Code (DTC) List - Vehicle .

If DTC U1814 is not set

2. Refer to Circuit/System Testing.

Circuit/System Testing

1. Vehicle in Service Mode, disconnect the X2 harness connector at the K84 Keyless Entry Control Module.

2. Verify that a test lamp illuminates between B+ circuit terminal 5 and ground.

If the test lamp does not illuminate and the circuit fuse is good

1. Vehicle OFF, remove the test lamp.

2. Test for less than 2 Ω in the B+ circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.

If the test lamp does not illuminate and the circuit fuse is open

1. Vehicle OFF, remove the test lamp.

2. Test for infinite resistance between the ignition circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K84 Keyless Entry Control Module.

If the test lamp illuminates

3. Vehicle OFF, connect the X2 harness connector at the K84 Keyless Entry Control Module and disconnect the X3 harness connector at the K9 Body Control Module.

4. Test for less than 1 V between the ignition circuit terminal 5 and ground.

If 1 V or greater

Repair the short to voltage on the circuit.

If less than 1 V

5. Vehicle in Service Mode.

6. Verify a test lamp illuminates between the ignition circuit terminal 5 and ground.

If the test lamp does not illuminate

1. Vehicle OFF. remove the test lamp.

2. Test for infinite resistance between the ignition circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance.

3. Test for less than 2 Ω in the ignition circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, replace the K84 Keyless Entry Control Module.

If the test lamp illuminates

7. Replace the K9 Body Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for the body control module and keyless entry control module replacement, programming and setup.

DTC B305E: INTERRUPTIBLE RAP RELAY CIRCUIT

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC B305E

Interruptible RAP Relay Circuit

For symptom byte information refer to Symptom Byte List

Diagnostic Fault Information

Circuit/System Description

The keyless entry control module controls the retained accessory power relay through the control circuit by applying voltage to the interruptible retained accessory power relay coil control circuit. The retained accessory power relay is energized when the ignition is in the Vehicle In Service Mode or the Vehicle On mode. The relay is also energized for approximately 10 min after shutting the vehicle OFF, providing no door is opened

Conditions for Running the DTC

System voltage is greater than 6 V.

The DTC can only set when the output is actively being requested by the module.

Conditions for Setting the DTC

B305E 01

The ignition output is not active and a short to battery is detected 3 consecutive times on the ignition voltage circuit.

B305E 02

The ignition output is active and a short to ground is detected on the ignition voltage circuit.

B305E 05

The ignition output is active and an open or short to battery is detected on the ignition voltage circuit.

Action Taken When the DTC Sets

B305E 01, B305E 05

No action is taken.

B305E 02

The module output driver will be shut down and not supply voltage to the circuit.

Conditions for Clearing the DTC

The current DTC will clear when the malfunction is no longer present and the ignition output is active.

A history DTC clears when the module ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction.

Reference Information

Schematic Reference

Power Moding Schematics

Power Distribution Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Retained Accessory Power Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Vehicle in Service Mode.

2. Verify the KR76 Retained Accessory Power Relay clicks ON and OFF when cycling the S83 vehicle ON/OFF switch between Vehicle in Service Mode and Vehicle OFF with the door open.

If the KR76 Retained Accessory Power Relay does not click ON and OFF

Refer to Circuit/System Testing.

If the KR76 Retained Accessory Power Relay clicks ON and OFF

3. All OK.

Circuit/System Testing

1. Vehicle OFF and all vehicle systems OFF, disconnect the KR76 Retained Accessory Power Relay. It may take up to 2 min for all vehicle systems to power down.

2. Test for less than 10 Ω between the ground circuit terminal 85 and ground.

If 10 Ω or greater

1. Vehicle OFF.

2. Test for less than 2 Ω in the ground circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, repair the open/high resistance in the ground connection.

If less than 10 Ω

3. Vehicle in Service Mode, connect a test lamp between the control circuit terminal 86 and ground circuit terminal 85.

4. Verify the test lamp turns ON and OFF when cycling the S83 vehicle ON/OFF switch between Vehicle in Service Mode and Vehicle OFF with the door open.

If the test lamp is always OFF

1. Vehicle OFF, remove the test lamp, disconnect the harness connector at the K84 Keyless Entry Control Module.

2. Test for infinite resistance between the control circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance

3. Test for less than 2 Ω in the control circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, replace the K84 Keyless Entry Control Module.

If the test lamp is always ON

1. Vehicle OFF, remove the test lamp, disconnect the harness connector at the K84 Keyless Entry Control Module, Vehicle in Service Mode.

2. Test for less than 1 V between the control circuit and ground.

If 1 V or greater, repair the short to voltage on the circuit.

If less than 1 V, replace the K84 Keyless Entry Control Module.

If the test lamp turns ON and OFF

5. Test or replace the KR76 Retained Accessory Power Relay.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Relay Replacement (Attached to Wire Harness) Relay Replacement (Within an Electrical Center) Control Module References for control module replacement, programming and setup.

DTC P15B9 OR P15BA: ELECTRIC A/C COMPRESSOR CONTROL MODULE IGNITION ON/START SWITCH CIRCUIT VOLTAGE

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC P15B9

Electric A/C Compressor Control Module Ignition On/Start Switch Circuit Low Voltage

DTC P15BA

Electric A/C Compressor Control Module Ignition On/Start Switch Circuit High Voltage

Diagnostic Fault Information

Circuit/System Description

The body control module (BCM) controls the ignition main relay by applying voltage to the run/crank coil control circuit. The ignition circuit is energized when the vehicle power mode is Vehicle ON or Vehicle in Service Mode. The hybrid powertrain control module 2 receives the power mode status from the A/C compressor over serial data and compares this status to its own internal power mode status.

Conditions for Running the DTC

P15B9

Vehicle power mode is Vehicle ON or Vehicle in Service Mode. Hybrid powertrain control module 2 is awake.

DTC's P2534, P2535, or U016B is not set. System voltage greater than 10.2 V.

P15BA

Vehicle power mode is Vehicle OFF.

Hybrid powertrain control module 2 is awake. DTC's P2534, P2535, or U016B is not set.

System voltage greater than 10.2 V.

Conditions for Setting the DTC

P15B9

Vehicle power mode is Vehicle ON or Vehicle in Service Mode. Hybrid powertrain control module 2 ignition input is active.

A/C compressor ignition input is not active for more than 2 s.

P15BA

Vehicle power mode is Vehicle OFF.

Hybrid powertrain control module 2 is awake.

Hybrid powertrain control module 2 ignition input is not active. A/C compressor ignition input is active for more than 2 s

Action Taken When the DTC Sets

P15B9, P15BA

DTCs P15B9 and P15BA are type B DTCs.

Conditions for Clearing the DTC

P15B9 or P15BA

DTCs P15B9 and P15BA, are type B DTCs.

Diagnostic Aids

A short to voltage in the ignition circuit will keep the vehicle modules awake, which can drain the vehicle's battery.

Reference Information

Schematic Reference

Power Distribution Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Power Mode Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Verify DTC B144B is not set.

If the DTC is set

Refer to DTC B144B. If the DTC is not set

2. Refer to Circuit/System Testing.

Circuit/System Testing

WARNING: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.

The High Voltage Disabling procedure includes the following steps: Identify how to disable high voltage.

Identify how to test for the presence of high voltage.

Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.

Before working on any high voltage system, be sure to wear the following Personal Protection Equipment:

Safety glasses with appropriate side shields when within 15 meters (50 feet) of the vehicle, either indoors or outdoors.

Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors.

Visually and functionally inspect the gloves before use.

Wear the Insulation gloves with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not.

Failure to follow the procedures may result in serious injury or death.

1. Vehicle OFF, disconnect the X1 harness connector at the G1 A/C Compressor.

2. Verify that a test lamp does not illuminate between the ignition circuit terminal 3 and ground.

If the test lamp illuminates

Repair the short to voltage on the ignition circuit.

If the test lamp does not illuminate

3. Vehicle in Service Mode

4. Verify a test lamp illuminates between the ignition circuit terminal 3 and ground.

If the test lamp does not illuminate and the circuit fuse is good

1. Vehicle OFF.

2. Test for less than 2 Ω in the ignition circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, refer to Power Mode Mismatch .

If the test lamp does not illuminate and the circuit fuse is open

1. Vehicle OFF, disconnect the harness connector at the G1 A/C Compressor and all devices that share the same ignition circuit.

2. Test for infinite resistance between the ignition circuit terminal 3 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance.

3. Connect each of the devices one at a time and test for greater than 10 Ω between the ignition circuit terminal 3 and ground.

If 10 Ω or less, disconnect the appropriate device and retest to verify if the short is in the circuit or the component.

If greater than 10 Ω replace the appropriate device.

If the test lamp illuminates

5. Replace the G1 A/C Compressor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for control module replacement, programming and setup.

DTC P1A5E OR P1A5F: BATTERY ENERGY CONTROL MODULE IGNITION ON/START SWITCH CIRCUIT LOW VOLTAGE

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC P1A5E

Battery Energy Control Module Ignition On/Start Switch Circuit Low Voltage

DTC P1A5F

Battery Energy Control Module Ignition On/Start Switch Circuit High Voltage

Diagnostic Fault Information

Circuit/System Description

The body control module (BCM) controls the ignition main relay through the control circuit by applying voltage to the run/crank coil control circuit. The ignition circuit is energized when the vehicle power mode is Vehicle ON or Vehicle in Service Mode.

Conditions for Running the DTC

P1A5E

Hybrid powertrain control module 2 is awake.

Vehicle power mode is Vehicle ON or Vehicle in Service Mode. Battery energy control module is awake.

System voltage greater than 9 V.

P1A5F

Hybrid powertrain control module 2 is awake. Vehicle power mode is Vehicle OFF.

Battery energy control module is awake. System voltage greater than 9 V.

Conditions for Setting the DTC

P1A5E

Hybrid powertrain control module 2 is awake. Ignition input is active and not above 5 V.

P1A5F

Hybrid powertrain control module 2 is awake. Ignition input is not active and not below 5 V.

Action Taken When the DTC Sets

P1A5E, P1A5F

DTCs P1A5E and P1A5F are type B DTCs.

Conditions for Clearing the DTC

P1A5E, P1A5F

DTCs P1A5E and P1A5F are type B DTCs.

Diagnostic Aids

A short to voltage in the ignition circuit will keep the vehicle modules awake, which can drain the vehicle's battery.

Reference Information

Schematic Reference

Power Distribution Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Power Mode Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Verify DTC B144B is not set.

If the DTC is set

Refer to DTC B144B. If the DTC is not set

2. Refer to Circuit/System Testing.

Circuit/System Testing

WARNING: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.

The High Voltage Disabling procedure includes the following steps: Identify how to disable high voltage.

Identify how to test for the presence of high voltage.

Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.

Before working on any high voltage system, be sure to wear the following

Personal Protection Equipment:

Safety glasses with appropriate side shields when within 15 meters (50 feet) of the vehicle, either indoors or outdoors.

Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors.

Visually and functionally inspect the gloves before use.

Wear the Insulation gloves with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not.

Failure to follow the procedures may result in serious injury or death.

1. Vehicle OFF, disable the high voltage at the A4 Hybrid/EV Battery Pack. Refer to High Voltage Disabling

2. Connect the 12 V battery, disconnect the X358 harness connector at the A4 Hybrid/EV Battery Pack.

3. Verify that a test lamp does not illuminate between the ignition circuit terminal 4 and ground.

If the test lamp illuminates

Repair the short to voltage on the ignition circuit.

If the test lamp does not illuminate

4. Vehicle in Service Mode

5. Verify a test lamp illuminates between the ignition circuit terminal 4 and ground.

If the test lamp does not illuminate and the circuit fuse is good

1. Vehicle OFF.

2. Test for less than 2 Ω in the ignition circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, refer to Power Mode Mismatch .

If the test lamp does not illuminate and the circuit fuse is open

1. Vehicle OFF, disconnect the harness connector at all devices that share the same ignition circuit.

2. Test for infinite resistance between the ignition circuit terminal 4 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance.

3. Vehicle OFF, remove the A4 Hybrid/EV Battery Pack cover. Refer to High Voltage Battery Cover Replacement

4. Connect the EL-50211 low voltage jumper harness extension.

5. Disconnect the X8 harness connector at the K16 Battery Energy Control Module.

6. Test for infinite resistance between the ignition circuit terminal 9 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance.

7. Connect each of the devices that share the same ignition circuit one at a time and test for greater than 100 Ω between the ignition circuit terminal 9 and ground.

If 100 Ω or less, disconnect the appropriate device and retest to verify if the short is in the

circuit or the component.

If greater than 100 Ω replace the appropriate device.

If the test lamp illuminates

6. Vehicle OFF, remove the A4 Hybrid/EV Battery Pack cover. Refer to High Voltage Battery Cover Replacement

7. Connect the EL-50211 low voltage jumper harness extension.

8. Disconnect the X8 harness connector at the K16 Battery Energy Control Module.

9. Verify that a test lamp does not illuminate between the ignition circuit terminal 9 and ground.

If the test lamp illuminates

Repair the short to voltage on the ignition circuit.

If the test lamp does not illuminate

10. Vehicle in Service Mode

11. Verify a test lamp illuminates between the ignition circuit terminal 9 and ground.

If the test lamp does not illuminate.

1. Vehicle OFF.

2. Test for less than 2 Ω in the ignition circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If the test lamp illuminates

12. Replace the K16 Battery Energy Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for control module replacement, programming and setup.

DTC P1A60: BATTERY ENERGY CONTROL MODULE IGNITION ACCESSORY SWITCH CIRCUIT LOW VOLTAGE

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC P1A60

Battery Energy Control Module Ignition Accessory Switch Circuit Low Voltage

Diagnostic Fault Information

Circuit/System Description

The hybrid powertrain control module 2 sends the serial data wake-up power mode status in a serial data message to the battery energy control module. The hybrid powertrain control module 2 also powers up the serial data wake-up circuit to the battery energy control module when the vehicle power mode is Vehicle ON or Vehicle in Service Mode.

Conditions for Running the DTC

Vehicle power mode is Vehicle ON or Vehicle in Service Mode Battery energy control module is awake

System voltage greater than 9 V

Conditions for Setting the DTC

Ignition input is active, and 500 ms after the ignition input transitions high, a voltage below 5 V is detected 3 consecutive times

Action Taken When the DTC Sets DTC P1A60 is a type B DTC. Conditions for Clearing the DTC DTC P1A60 is a type B DTC. Diagnostic Aids

A short to voltage in the serial data wake-up circuit will keep the vehicle bus awake, which can drain the vehicle's battery.

Reference Information

Schematic Reference

Data Communication Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Power Mode Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Verify DTC U1814, U2099, or P06E4 is not set.

If any of the DTCs are set

Refer to Diagnostic Trouble Code (DTC) List - Vehicle .

If none of the DTCs are set

2. Refer to Circuit/System Testing.

Circuit/System Testing

WARNING: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.

The High Voltage Disabling procedure includes the following steps: Identify how to disable high voltage.

Identify how to test for the presence of high voltage.

Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.

Before working on any high voltage system, be sure to wear the following Personal Protection Equipment:

Safety glasses with appropriate side shields when within 15 meters (50 feet) of the vehicle, either indoors or outdoors.

Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors.

Visually and functionally inspect the gloves before use.

Wear the Insulation gloves with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not.

Failure to follow the procedures may result in serious injury or death.

1. Vehicle OFF, disable the high voltage at the A4 Hybrid/EV Battery Pack. Refer to High Voltage Disabling

2. Connect the 12 V battery, disconnect the X357 harness connector at the A4 Hybrid/EV Battery Pack.

3. Connect a test lamp between the serial data wake-up circuit terminal 5 and ground.

4. Verify the test lamp turns ON and OFF when cycling the S39 Ignition Mode Switch between Vehicle in Service Mode and Vehicle OFF.

If the test lamp is always OFF

1. Vehicle OFF, disconnect the harness connector at the K114B Hybrid/EV Powertrain Control Module 2.

2. Test for less than 2 Ω in the serial data wake-up circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, replace the K114B Hybrid/EV Powertrain Control Module 2.

If the test lamp is always ON

1. Vehicle OFF, disconnect the harness connector at the K114B Hybrid/EV Powertrain Control Module 2.

2. Test for less than 1 V between the ignition circuit and ground.

If 1 V or greater, repair the short to voltage on the circuit.

If less than 1 V, replace the K114B Hybrid/EV Powertrain Control Module 2.

If the test lamp turns ON and OFF

5. Vehicle OFF, remove the A4 Hybrid/EV Battery Pack cover. Refer to High Voltage Battery Cover Replacement

6. Connect the EL-50211 low voltage jumper harness extension.

7. Disconnect the X8 harness connector at the K16 Battery Energy Control Module.

8. Connect a test lamp between the serial data wake-up circuit terminal 3 and ground.

9. Verify the test lamp turns ON and OFF when cycling the S39 Ignition Mode Switch between Vehicle in Service Mode and Vehicle OFF.

If the test lamp is always OFF

1. Vehicle OFF, disconnect the EL-50211 low voltage jumper harness extension.

2. Test for less than 2 Ω in the serial data wake-up circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If the test lamp is always ON

1. Vehicle OFF, disconnect the EL-50211 low voltage jumper harness extension.

2. Test for less than 1 V between the ignition circuit and ground.

If 1 V or greater, repair the short to voltage on the circuit.

If the test lamp turns ON and OFF

10. Replace the K16 Battery Energy Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for control module replacement, programming and setup,

DTC P2534 OR P2535: IGNITION ON/START SWITCH CIRCUIT VOLTAGE

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC P2534

Ignition On/Start Switch Circuit Low Voltage

DTC P2535

Ignition On/Start Switch Circuit High Voltage

Diagnostic Fault Information

Circuit/System Description

The body control module (BCM) controls the ignition relay through the control circuit by applying voltage to the circuit. The ignition circuit is energized when the vehicle power mode is Vehicle ON or Vehicle in Service Mode.

Conditions for Running the DTC

P2534, P2535

The control module is awake. Conditions for Setting the DTC P2534

The control module detects 2 V or less on the ignition voltage circuit.

P2535

The control module detects greater than 5 V or greater on the ignition voltage circuit, with the ignition turned OFF.

Action Taken When the DTC Sets

P2534, P2535

DTCs P2534 and P2535 are type A DTCs.

Conditions for Clearing the DTC

P2534, P2535

DTCs P2534 and P2535 are type A DTCs.

Diagnostic Aids

A short to voltage in the ignition circuit will keep the vehicle modules awake, which can drain the vehicle's battery.

Reference Information

Schematic Reference

Power Distribution Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Power Mode Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Verify DTC B144B is not set.

If the DTC is set

Refer to DTC B144B. If the DTC is not set

2. Refer to Circuit/System Testing.

Circuit/System Testing

For European Regions

WARNING: High voltage enabling and disabling shall be only performed by High Voltage Qualified Technicians. The procedures for high voltage enabling/disabling can be found in the service instructions and must be strictly followed at all times. The usage of the Protocol High Voltage Disabling / Enabling is mandatory. The High Voltage Qualified Technician is responsible for the adherence to the

manufacturer's service instructions as well as current national legal regulations.

Failure to follow the procedures exactly as written may result in serious injury or death.

Questions regarding training can be answered by your national training center.

WARNING: Any hybrid/EV battery pack replacement shall be performed by High Voltage Qualified Technicians only. The replacement procedure can be found in the service instruction and must be strictly followed at all times. The High Voltage Qualified Technician is responsible for adherence to the manufacturer's service instructions as well as current national legal regulations. If the hybrid/EV battery pack needs to be replaced contact the Technical Assistance Centre for further instructions prior removal of the battery pack.

For Non-European Regions

WARNING: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.

The High Voltage Disabling procedure includes the following steps: Identify how to disable high voltage.

Identify how to test for the presence of high voltage.

Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.

Before working on any high voltage system, be sure to wear the following Personal Protection Equipment:

Safety glasses with appropriate side shields when within 15 meters (50 feet) of the vehicle, either indoors or outdoors.

Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors.

Visually and functionally inspect the gloves before use.

Wear the Insulation gloves with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not.

Failure to follow the procedures may result in serious injury or death.

1. Vehicle OFF and all vehicle systems off, disconnect the harness connector at the control module setting the DTC.

2. Verify that a test lamp does not illuminate between the ignition circuit and ground.

If the test lamp illuminates

Repair the short to voltage on the ignition circuit.

If the test lamp does not illuminate

3. Vehicle in Service Mode.

4. Verify a test lamp illuminates between the ignition circuit and ground.

If the test lamp does not illuminate and the circuit fuse is good

1. Vehicle OFF, remove the test lamp.

2. Test for less than 2 Ω in the ignition circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, refer to Power Mode Mismatch

If the test lamp does not illuminate and the circuit fuse is open

1. Vehicle OFF, remove the test lamp.

2. Test for infinite resistance between the ignition circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the control module setting the DTC.

If the test lamp illuminates

5. Replace the control module setting the DTC.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for the appropriate control module replacement, programming and setup.

DTC P2537: IGNITION ACCESSORY SWITCH CIRCUIT LOW VOLTAGE

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC P2537

Ignition Accessory Switch Circuit Low Voltage

Diagnostic Fault Information

Circuit/System Description

The control module continuously monitors the voltage on the ignition accessory circuit every 0.1s. Higher or lower than normal voltage may cause erratic vehicle operation.

Conditions for Running the DTC

P2537

Propulsion system is active for.5 s. Conditions for Setting the DTC P2537

The device detects the accessory voltage circuit is open for 0.1 s.

Action Taken When the DTC Sets

P2537

P2537 is a Type B DTC. Conditions for Clearing the DTC P2537

P2537 is a Type B DTC.

Diagnostic Aids

Short to ground may set multiple no communication codes for high speed GMLAN devices.

Reference Information

Schematic Reference

Data Communication Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Power Mode Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Verify DTC U1814, U2099, or P06E4 is not set.

If any of the DTCs are set

Refer to Diagnostic Trouble Code (DTC) List - Vehicle .

If none of the DTCs are set

2. Refer to Circuit/System Testing.

Circuit/System Testing

WARNING: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.

The High Voltage Disabling procedure includes the following steps: Identify how to disable high voltage.

Identify how to test for the presence of high voltage.

Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.

Before working on any high voltage system, be sure to wear the following Personal Protection Equipment:

Safety glasses with appropriate side shields when within 15 meters (50 feet) of the vehicle, either indoors or outdoors.

Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors.

Visually and functionally inspect the gloves before use.

Wear the Insulation gloves with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not.

Failure to follow the procedures may result in serious injury or death.

Hybrid/EV Powertrain Control Module 2 Circuit Malfunction

1. Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2.

2. Vehicle in Service Mode.

3. Verify a test lamp illuminates between the accessory wake up serial data circuit terminal 67 and ground.

If the test lamp does not illuminate.

1. Ignition OFF remove the test lamp, disconnect the X4 connector at the K9 Body Control Module.

2. Test for less than 2 Ω on the ignition circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, replace the K9 Body Control Module.

If the test lamp illuminates

4. Replace the K114B Hybrid/EV Powertrain Control Module 2.

Engine Control Module Circuit Malfunction

1. Vehicle OFF and all vehicle systems off, disconnect the X1 harness connector at the K20 Engine Control Module.

2. Vehicle in Service Mode.

3. Verify a test lamp illuminates between the Accessory Wake up Serial Data 2 circuit terminal 13 and ground.

If the test lamp does not illuminate

1. Vehicle OFF, remove the test lamp, disconnect the harness connector at the KR114B Hybrid/EV Powertrain Control Module 2.

2. Test for less than 2 Ω on the Accessory Wake up Serial Data 2 circuit end to end. If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, replace the KR114B Hybrid/EV Powertrain Control Module 2.

If the test lamp illuminates

4. Replace the control module setting the K20 Engine Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for control module replacement, programming and setup,

SYMPTOMS - WIRING SYSTEMS

NOTE: The following steps must be completed before using the symptom tables.

1. Perform the Diagnostic System Check - Vehicle before using the symptom tables in order to verify that all of the following are true:

There are no DTCs set.

The control modules can communicate via the serial data links.

2. Review the system operation in order to familiarize yourself with the system functions. Refer to:

Power Mode Description and Operation

Retained Accessory Power Description and Operation

Visual/Physical Inspection

Inspect for aftermarket devices which could affect the operation of the systems. Refer to Checking Aftermarket Accessories .

Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections.

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

Power Mode Mismatch

Retained Accessory Power Malfunction

Vehicle ON/OFF Switch Indicator Malfunction Vehicle Will Not Change Power Mode

IGNITION CAN/CANNOT BE TURNED OFF WITH TRANSMISSION IN ANY GEAR

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provides an overview of each diagnostic category

Diagnostic Fault Information

Circuit/System Description

The electronic park lock system purpose is to prevent the ignition from being switched to the OFF position when the transmission shift lever is in any position other than Park and the vehicle may still be moving. The electronic park lock system incorporates the park position switch that located in the shift lock control switch. When the transmission shift lever is in Park, the park position switch closes and the BCM allows the ignition to be turned OFF.

If the vehicle is not in Park, the ignition will turn to ACC/ACCESSORY and display the message SHIFT TO PARK in the Driver Information Center. When the vehicle is shifted into Park, the ignition system will switch to OFF.

Diagnostic Aids

Verify that the transmission shift selector indicator matches the position of the gear shift lever while selecting between the Park, Reverse, Drive and Low positions.

Reference Information

Schematic Reference

Shift Lock Control Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Electronic Park Lock Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

Circuit/System Verification

1. Vehicle in Service Mode.

2. Verify the scan tool Body Control Module In Park Switch Status parameter changes between On and Off when shifting the S3 Transmission Shift Lever in and out of Park.

If the parameter does not change

Refer to Circuit/System Testing.

If the parameter changes

3. All OK.

Circuit/System Testing

1. Vehicle OFF and all vehicle systems OFF, disconnect the harness connector at the S3 Transmission Shift Lever. It may take up to 2 min for all vehicle systems to power down.

2. Test for less than 10 Ω between the ground circuit terminal 2 and ground.

If 10 Ω or greater

1. Vehicle OFF.

2. Test for less than 2 Ω in the ground circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, repair the open/high resistance in the ground connection.

If less than 10 Ω

3. Vehicle in Service Mode.

4. Verify the scan tool Body Control Module In Park Switch Status parameter is Off.

If not Off

1. Vehicle OFF, disconnect the harness connector at the K9 Body Control Module.

2. Test for infinite resistance between the signal circuit terminal 6 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module.

If Off

5. Install a 3 A fused jumper wire between the signal circuit terminal 6 and the ground circuit terminal 2.

6. Verify the scan tool Body Control Module In Park Switch Status parameter is On.

If not On

1. Vehicle OFF, remove the jumper wire, disconnect the harness connector at the K9 Body Control

Module, Vehicle in Service Mode.

2. Test for less than 1 V between the signal circuit and ground.

If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V

3. Test for less than 2 Ω in the signal circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, replace the K9 Body Control Module.

If On

7. Test or replace the S3 Transmission Shift Lever.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Transmission Control Replacement (With Base) Transmission Control Replacement (Without Base) Control Module References for the appropriate control module replacement, programming, and setup.

POWER MODE MISMATCH

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Circuit/System Description

The body control module (BCM) controls the ignition main relay by applying voltage to the run/crank relay coil control circuit. The ignition main relay is energized when the vehicle is in Service Mode, the vehicle is ON, or when a remote start is requested.

The keyless entry control module controls the retained accessory power relay by applying voltage to the interruptible retained accessory power relay coil control circuit. The retained accessory power relay is energized during all power modes, except OFF-awake. The relay is also energized for approximately 10 min after shutting the vehicle OFF providing, no door is opened and during transmitter authentication. The keyless entry control module will deactivate components that may cause radio frequency (RF) interference when the vehicle on/off switch is pressed which may result in NO REMOTE DETECTED displayed on the driver information center.

The engine control module (ECM) controls the engine controls ignition relay by applying voltage to the engine controls relay control circuit.

Reference Information

Schematic Reference

Power Distribution Schematics Power Moding Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Power Mode Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs

Relay Replacement (Attached to Wire Harness) Relay Replacement (Within an Electrical Center) Testing for Intermittent Conditions and Poor Connections

Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

NOTE: Use schematics to determine which ignition relay supplies the ignition feed for the appropriate devices. Use the connector end view to identify the ignition circuit terminal for each of those devices.

1. Vehicle in Service Mode.

2. Verify that the appropriate devices controlled by the KR73 Ignition Main Relay turn ON and OFF when commanding the Run/Crank Relay On and Off with a scan tool.

If the devices do not turn ON and OFF

Refer to Circuit/System Testing - Diagnostic A.

If the devices turn ON and OFF

3. Verify that the appropriate devices controlled by the KR75 Engine Controls Ignition Relay turn ON and OFF when cycling the between Vehicle in Service Mode and Vehicle OFF.

If the devices do not turn ON and OFF

Refer to Circuit/System Testing - Diagnostic B.

If the devices turn ON and OFF

4. Verify that the appropriate devices controlled by the KR76 Retained Accessory Power Relay turn ON and OFF when cycling the between Vehicle in Service Mode and Vehicle OFF.

If the devices do not turn ON and OFF

Refer to Circuit/System Testing - Diagnostic C.

If the devices turn ON and OFF

5. All OK.

Circuit/System Testing

WARNING: High voltage enabling and disabling shall be only performed by High Voltage Qualified Technicians. The procedures for high voltage enabling/disabling can be found in the service instructions and must be strictly followed at all times. The usage of the Protocol High Voltage Disabling / Enabling is mandatory. The High Voltage Qualified Technician is responsible for the adherence to the manufacturer's service instructions as well as current national legal regulations.

Failure to follow the procedures exactly as written may result in serious injury or death.

Questions regarding training can be answered by your national training centre.

WARNING: Any hybrid/EV battery pack replacement shall be performed by High Voltage Qualified Technicians only. The replacement procedure can be found in the service instruction and must be strictly followed at all times. The High Voltage Qualified Technician is responsible for adherence to the manufacturer's service instructions as well as current national legal regulations. If the hybrid/EV battery pack needs to be replaced contact the Technical Assistance Centre for further instructions prior removal of the battery pack.

Diagnostic A

1. Vehicle OFF and all vehicle systems OFF, disconnect the KR73 Ignition Main Relay. It may take up to 2 min for all vehicle systems to power down.

2. Test for less than 10 Ω between the ground circuit terminal 1 and ground.

If 10 Ω or greater

1. Vehicle OFF.

2. Test for less than 2 Ω in the ground circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, repair the open/high resistance in the ground connection.

If less than 10 Ω

3. Vehicle in Service Mode.

4. Verify a test lamp illuminates between the B+ circuit terminal 3 and ground.

If the test lamp does not illuminate

Replace the X50A Fuse Block - Underhood

If the test lamp illuminates

5. Connect a test lamp between the control circuit terminal 2 and the ground circuit terminal 1.

6. Verify the test lamp turns ON and OFF when commanding the Run/Crank Relay On and Off with a scan tool.

If the test lamp is always OFF

1. Vehicle OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module.

2. Test for infinite resistance between the control circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit.

If infinite resistance.

3. Test for less than 2 Ω in the control circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, replace the K9 Body Control Module.

If the test lamp is always ON

1. Vehicle OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module, Vehicle in Service Mode.

2. Test for less than 1 V between the control circuit and ground.

If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module.

If the test lamp turns ON and OFF

7. Verify that a test lamp does not illuminate between the ignition circuit terminal 5 and ground.

If the test lamp illuminates

Repair the short to voltage on the ignition circuit.

If the test lamp does not illuminate

8. Vehicle in Service Mode, connect a 40 A fused jumper wire between the B+ circuit terminal 3 and the ignition circuits listed below.

Ignition circuit terminal 4 Ignition circuit terminal 5

9. Verify the device is activated.

If the device does not activate

1. Vehicle OFF, disconnect the harness connector at the device.

2. Test for infinite resistance between the ignition circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance

3. Test for less than 2 Ω in the ignition circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, replace the device.

If the device activates

10. Test or replace the KR73 Ignition Main Relay.

Diagnostic B

1. Vehicle OFF and all vehicle systems OFF, disconnect the KR75 Engine Controls Ignition Relay, Vehicle in Service Mode.

2. Verify a test lamp illuminates between the B+ circuit terminal 1 and ground.

If the test lamp does not illuminate

Replace the X50A Fuse Block - Underhood

If the test lamp illuminates

3. Verify a test lamp illuminates between the B+ circuit terminal 3 and ground.

If the test lamp does not illuminate

Replace the X50A Fuse Block - Underhood

If the test lamp illuminates

4. Connect a test lamp between the B+ circuit terminal 1 and the control circuit terminal 2.

5. Verify the test lamp turns ON and OFF when cycling the S83 vehicle ON/OFF switch between Vehicle in Service Mode and Vehicle OFF.

If the test lamp is always OFF

1. Vehicle OFF, remove the test lamp, disconnect the harness connector at the K20 engine control module, Vehicle in Service Mode.

2. Test for less than 1 V between the control circuit and ground.

If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V

3. Vehicle OFF.

4. Test for less than 2 Ω in the control circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, replace the K20 engine control module.

If the test lamp is always ON

1. Vehicle OFF, remove the test lamp, disconnect the harness connector at the K20 engine control module.

2. Test for infinite resistance between the control circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K20 engine control module.

If the test lamp turns ON and OFF

6. Verify that a test lamp does not illuminate between the ignition circuit terminal 5 and ground.

If the test lamp illuminates

Repair the short to voltage on the ignition circuit.

If the test lamp does not illuminate

7. Vehicle in Service Mode, connect a 40 A fused jumper wire between the B+ circuit terminal 3 and the ignition circuit terminal 5.

8. Verify device is activated.

If the device does not activate

1. Vehicle OFF, disconnect the harness connector at the device.

2. Test for infinite resistance between the ignition circuit terminal 87 and ground. If less than infinite resistance, repair the short to ground on the circuit.

If infinite resistance

3. Test for less than 2 Ω in the ignition circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, replace the device.

If the device activates

9. Test or replace the KR75 Engine Controls Ignition Relay.

Diagnostic C

1. Vehicle OFF and all vehicle systems OFF, disconnect the KR76 Retained Accessory Power Relay. It may take up to 2 min for all vehicle systems to power down.

2. Test for less than 10 Ω between the ground circuit terminal 85 and ground.

If 10 Ω or greater

1. Vehicle OFF.

2. Test for less than 2 Ω in the ground circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, repair the open/high resistance in the ground connection.

If less than 10 Ω

3. Vehicle in Service Mode.

4. Verify a test lamp illuminates between the B+ circuit terminal 30 and ground.

If the test lamp does not illuminate

Replace the X51A Fuse Block - Instrument Panel

If the test lamp illuminates

5. Connect a test lamp between the control circuit terminal 86 and the ground circuit terminal 85.

6. Verify the test lamp turns ON and OFF when cycling the between Vehicle in Service Mode and Vehicle OFF.

If the test lamp is always OFF

1. Vehicle OFF, remove the test lamp, disconnect the harness connector at the K84 Keyless Entry Control Module.

2. Test for infinite resistance between the control circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance.

3. Test for less than 2 Ω in the control circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, replace the K84 Keyless Entry Control Module.

If the test lamp is always ON

1. Vehicle OFF, remove the test lamp, disconnect the harness connector at the K84 Keyless Entry Control Module, Vehicle in Service Mode.

2. Test for less than 1 V between the control circuit and ground.

If 1 V or greater, repair the short to voltage on the circuit.

If less than 1 V, replace the K84 Keyless Entry Control Module.

If the test lamp turns ON and OFF

7. Verify that a test lamp does not illuminate between the ignition circuit terminal 87 and ground.

If the test lamp illuminates

Repair the short to voltage on the ignition circuit.

If the test lamp does not illuminate

8. Vehicle in Service Mode, connect a 40 A fused jumper wire between the B+ circuit terminal 30 and the ignition circuit terminal 87.

9. Verify device is activated.

If the device does not activate

1. Vehicle OFF, disconnect the harness connector at the device.

2. Test for infinite resistance between the ignition circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance

3. Test for less than 2 Ω in the ignition circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, replace the device.

If the device activates

10. Test or replace the KR76 Retained Accessory Power Relay.

Component Testing

Relay Test

1. Vehicle OFF, disconnect the appropriate relay.

2. Test for 70 - 150 Ω between terminals (85 or 1) and (86 or 2).

If less than 70 or greater than 150 Ω

Replace the relay.

If between 70 - 150 Ω

3. Test for infinite resistance between the terminals listed below: (30 or 3) and (86 or 2)

(30 or 3) and (87 or 5)

(30 or 3) and (85 or 1)

(85 or 1) and (87 or 5)

(86 or 2) and (87 or 5)

If less than infinite resistance

Replace the relay.

If infinite resistance

4. Install a 3 A fused jumper wire between relay terminal (85 or 1) and 12 V. Install a jumper wire between relay terminal (86 or 2) and ground.

5. Test for less than 5.0 Ω between terminals (30 or 3) and (87 or 5).

If 5.0 Ω or greater

Replace the relay.

If less than 5.0 Ω

6. All OK

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for control module replacement, programming and setup.

RETAINED ACCESSORY POWER MALFUNCTION

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Diagnostic Fault Information

Circuit/System Description

The keyless entry control module controls the retained accessory power relay by applying voltage to the interruptible retained accessory power relay coil control circuit. The retained accessory power relay is energized during all power modes, except OFF-awake. The relay is also energized for approximately 10 min after shutting the vehicle OFF providing, no door is opened and during transmitter authentication. The keyless entry control module will deactivate components that may cause radio frequency (RF) interference when the vehicle on/off switch is pressed which may result in NO REMOTE DETECTED displayed on the driver information center.

Reference Information

Schematic Reference

Power Distribution Schematics Power Moding Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Retained Accessory Power Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs

Relay Replacement (Attached to Wire Harness) Relay Replacement (Within an Electrical Center) Testing for Intermittent Conditions and Poor Connections

Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

NOTE: Use schematics to determine which devices are controlled by the KR76 Retained Accessory Power Relay. Use the connector end view to identify the ignition circuit terminal for each of those devices.

1. Ignition ON.

2. Verify the appropriate devices controlled by the KR76 Retained Accessory Power Relay turn ON and OFF when cycling the S83 vehicle ON/OFF switch between Vehicle in Service Mode and Vehicle OFF with the door open.

If the devices do not turn ON and OFF

Refer to Circuit/System Testing

If the devices turn ON and OFF

3. All OK.

Circuit/System Testing

1. Vehicle OFF and all vehicle systems OFF, disconnect the KR76 Retained Accessory Power Relay. It may take up to 2 min for all vehicle systems to power down.

2. Test for less than 10 Ω between the ground circuit terminal 85 and ground.

If 10 Ω or greater

1. Vehicle OFF.

2. Test for less than 2 Ω in the ground circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, repair the open/high resistance in the ground connection.

If less than 10 Ω

3. Vehicle in Service Mode.

4. Verify a test lamp illuminates between the B+ circuit terminal 30 and ground.

If the test lamp does not illuminate

Replace the X51A Fuse Block - Instrument Panel

If the test lamp illuminates

5. Connect a test lamp between the control circuit terminal 86 and the ground circuit terminal 85.

6. Verify the test lamp turns ON and OFF when cycling the S83 vehicle ON/OFF switch between Vehicle in

Service Mode and Vehicle OFF with the door open.

If the test lamp is always OFF

1. Vehicle OFF, remove the test lamp, disconnect the harness connector at the K84 Keyless Entry Control Module.

2. Test for infinite resistance between the control circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance.

3. Test for less than 2 Ω in the control circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, replace the K84 Keyless Entry Control Module.

If the test lamp is always ON

1. Vehicle OFF, remove the test lamp, disconnect the harness connector at the K84 Keyless Entry Control Module, Vehicle in Service Mode.

2. Test for less than 1 V between the ignition circuit and ground.

If 1 V or greater, repair the short to voltage on the circuit.

If less than 1 V, replace the K84 Keyless Entry Control Module.

If the test lamp turns ON and OFF

7. Connect the KR76 Retained Accessory Power Relay.

8. Disconnect the appropriate X80 Accessory Power Receptacle or T22 Mobile Device Wireless Charger Module.

9. Vehicle OFF.

10. Verify that a test lamp does not illuminate between each of the ignition circuits listed below and ground. X80H Accessory Power Receptacle - Center Console - Ignition circuit terminal A

X80L Accessory Power Receptacle - Center Console Rear - Ignition circuit terminal A T22 Mobile Device Wireless Charger Module - Ignition circuit terminal 1

If the test lamp illuminates

Repair the short to voltage on the ignition circuit.

If the test lamp does not illuminate

11. Vehicle in Service Mode.

12. Verify that a test lamp illuminates between each of the ignition circuits listed below and ground. X80H Accessory Power Receptacle - Center Console - Ignition circuit terminal A

X80L Accessory Power Receptacle - Center Console Rear - Ignition circuit terminal A T22 Mobile Device Wireless Charger Module - Ignition circuit terminal 1

If the test lamp does not illuminate and the circuit breaker or fuse is good

1. Vehicle OFF, remove the test lamp.

2. Test for less than 2 Ω in the ignition circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, test or replace the K84 Keyless Entry Control Module.

If the test lamp does not illuminate and the circuit breaker or fuse is open

1. Vehicle OFF, remove the test lamp.

2. Test for infinite resistance between the ignition circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit.

If infinite resistance, test or replace the appropriate X80 Accessory Power Receptacle or T22 Mobile Device Wireless Charger Module.

If the test lamp illuminates

13. Test or replace the appropriate X80 Accessory Power Receptacle or T22 Mobile Device Wireless Charger Module.

Component Testing

Relay Test

1. Vehicle OFF, disconnect the KR76 Retained Accessory Power Relay.

2. Test for 70 - 150 Ω between terminals 85 and 86.

If less than 70 or greater than 150 Ω

Replace the relay.

If between 70 - 150 Ω

3. Test for infinite resistance between the following terminals: 30 and 86

30 and 87

30 and 85

85 and 87

If less than infinite resistance

Replace the relay.

If infinite resistance

4. Test for less than 5.0 Ω between terminals 30 and 87.

If 5.0 Ω or greater

Replace the relay.

If less than 5.0 Ω

5. Install a 3 A fused jumper wire between relay terminal 41 and 12 V. Install a jumper wire between relay terminal 40 and ground.

6. Test for less than 5.0 Ω between terminals 30 and 87.

If 5.0 Ω or greater

Replace the relay.

If less than 5.0 Ω

7. All OK

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Accessory Power Receptacle Replacement

Control Module References for control module replacement, programming and setup.

VEHICLE ON/OFF SWITCH INDICATOR MALFUNCTION

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Diagnostic Fault Information

Circuit/System Description

The vehicle ON/OFF switch has a single LED that indicates the vehicle power mode. When the vehicle is in the OFF mode, the LED is not illuminated. Pressing and holding the vehicle ON/OFF switch for at least 5 s, without the brake pedal applied, will enter the Vehicle Service Mode and the blue LED will illuminate. With the vehicle OFF and the brake pedal applied, pressing the vehicle ON/OFF switch once, the vehicle will enter the Vehicle ON mode and the blue LED will illuminate.

The vehicle ON/OFF switch contains two individual switches that provides redundant switch inputs to both the body control module (BCM) and the keyless entry control module. The BCM supplies the vehicle ON/OFF switch a constant B+ signal. The BCM monitors this signal to determine if the switch is released or pressed.

When the vehicle ON/OFF switch is not pressed, voltage on the signal circuit is pulled down through two resistors in the switch. When the vehicle ON/OFF switch is pressed, voltage on the signal circuit is pulled down through only one resistor, changing the voltage seen at the BCM and indicating that the vehicle ON/OFF switch is pressed.

The keyless entry control module monitors voltage on the switch is the same manner as the BCM, but monitors the second switch located in the vehicle ON/OFF switch.

Reference Information Schematic Reference Power Moding Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Power Mode Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Verify the blue LED illuminates when the S83 Vehicle ON/OFF Switch is pressed and held for at least 5 s, with the brake pedal released.

If the blue LED does not illuminate

Refer to Circuit/System Testing.

If the blue LED illuminates

2. All OK.

Circuit/System Testing

1. Vehicle OFF and all vehicle systems OFF, disconnect the harness connector at the S83 Vehicle ON/OFF Switch. It may take up to 2 min for all vehicle systems to power down.

2. Test for less than 10 Ω between the low reference circuit terminal 4 and ground.

If 10 Ω or greater

1. Vehicle OFF.

2. Test for less than 2 Ω in the ground circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, repair the open/high resistance in the ground connection.

If less than 10 Ω

3. Test for less than 1 V between the control circuit terminal 5 and ground.

If 1 V of greater

1. Vehicle OFF, disconnect the harness connector at the K9 Body Control Module, Vehicle in Service Mode.

2. Test for less than 1 V between the control circuit and ground.

If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V

3. Test for less than 2 Ω in control circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, replace the K9 Body Control Module.

If less than 1 V

4. Vehicle OFF, connect the harness connector at the S83 Vehicle ON/OFF Switch.

5. Vehicle in Service Mode, disconnect the harness connector at the S83 Vehicle ON/OFF Switch.

6. Verify a test lamp illuminates between the control circuit terminal 5 and ground.

If the test lamp does not illuminate

1. Vehicle OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module.

2. Test for infinite resistance between the control circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance

3. Test for less than 2 Ω in the control circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, replace the K9 Body Control Module.

If the test lamp illuminates

7. Test or replace the S83 Vehicle ON/OFF Switch.

Component Testing

1. Vehicle OFF, disconnect the harness at the S83 Vehicle ON/OFF Switch.

2. Connect a jumper wire between the S83 Vehicle ON/OFF Switch terminal 4 and ground.

3. Connect a 3 A fused jumper wire between the S83 Vehicle ON/OFF Switch terminal 5 and B+.

4. Verify the blue LED illuminates.

If the LED does not illuminate

Replace the S83 vehicle ON/OFF switch.

If the LED illuminates

5. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Ignition and Start Switch Replacement

Control Module References for the body control module replacement, programming and setup.

VEHICLE WILL NOT CHANGE POWER MODE

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Diagnostic Fault Information

Circuit/System Description

The vehicle ON/OFF switch has a single LED that indicate the vehicle power mode. When the vehicle is in the off mode, the LED is not illuminated. Pressing and holding the vehicle ON/OFF switch for up to 10 s, without the brake pedal applied, will enter the Vehicle Service Mode and the blue LED will illuminate. With the vehicle OFF and the brake pedal applied, pressing the vehicle ON/OFF switch once, the vehicle will enter the Vehicle ON mode and the blue LED will illuminate.

The vehicle ON/OFF switch contains 2 individual switches that provides redundant switch inputs to both the body control module (BCM) and the keyless entry control module. The BCM supplies the vehicle ON/OFF switch a constant B+ signal. The BCM monitors this signal to determine if the switch is released or pressed. When the vehicle ON/OFF switch is not pressed, voltage on the signal circuit is pulled down through 2 resistors in the switch. When the vehicle ON/OFF switch is pressed, voltage on the signal circuit is pulled down through only one resistor, changing the voltage seen at the BCM and indicating that the vehicle ON/OFF switch is pressed.

The keyless entry control module monitors voltage on the switch is the same manner as the BCM, but monitors the second switch located in the vehicle ON/OFF switch. The keyless entry control module also controls the backup power for the ignition run relay through the control circuit by applying voltage to the ignition voltage circuit. This circuit is a pass-thru in the BCM and will energize the ignition circuit when the vehicle is in Service Mode, the vehicle is ON, or when a remote start is requested.

Reference Information

Schematic Reference

Power Distribution Schematics Power Moding Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Power Mode Description and Operation

Keyless Entry System Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Verify DTC B097B 08 or B097B 61 is not set.

If either DTC is set

Test or replace the S83 Vehicle On/Off Switch.

If the DTCs are not set

2. Verify the blue LED illuminates when the S83 Vehicle On/Off Switch is pressed and held for up to 10 s, with the brake pedal released.

If the blue LED does not illuminate

Refer to Circuit/System Testing.

If the blue LED illuminates

3. All OK.

Circuit/System Testing

1. Vehicle OFF and all vehicle systems OFF, disconnect the harness connector at the S83 Vehicle On/Off Switch. It may take up to 2 min for all vehicle systems to power down.

2. Test for less than 10 Ω between the ground circuit terminal 4 and ground.

If 10 Ω or greater

1. Test for less than 2 Ω in the ground circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, repair the open/high resistance in the ground connection.

If less than 10 Ω

3. Test for less than 10 Ω between the low reference circuit terminal 7 and ground.

If 10 Ω or greater

1. Test for less than 2 Ω in the ground circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, replace the K84 Keyless Entry Control Module.

If less than 10 Ω

4. Connect the S83 Vehicle On/Off Switch, Vehicle in Service Mode.

5. Disconnect the S83 Vehicle On/Off Switch.

6. Verify the scan tool K9 Body Control Module Push Button Ignition Switch Voltage parameter is greater than 11 V.

If 11 V or less

1. Connect the S83 Vehicle On/Off Switch.

2. Vehicle OFF, disconnect the X2 harness connector at the K9 Body Control Module and S83 Vehicle On/Off Switch.

3. Test for infinite resistance between the signal circuit terminal 6 and ground.

If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module.

If greater than 11 V

7. Install a 3 A fused jumper wire between the signal circuit terminal 6 and ground.

8. Verify the scan tool K9 Body Control Module Push Button Ignition Switch Voltage parameter is less than 1 V.

If 1 V or greater

1. Disconnect the harness connector at the K9 Body Control Module.

2. Test for less than 1 V between the signal circuit and ground.

If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V

3. Test for less than 2 Ω in signal circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, replace the K9 Body Control Module.

If less than 1 V

9. Connect the harness connector at the S83 Vehicle On/Off Switch.

10. Verify the scan tool K9 Body Control Module Push Button Ignition Switch Voltage parameter is 8 - 10 V, with the S83 Vehicle On/Off Switch released.

If not between 8 - 10 V

Test or replace the S83 Vehicle On/Off Switch.

If between 8 - 10 V

11. Verify the scan tool K9 Body Control Module Push Button Ignition Switch Voltage parameter is 4 - 7 V, with the S83 Vehicle On/Off Switch pressed.

If not between 4 - 7 V

Test or replace the S83 Vehicle On/Off Switch.

If between 4 - 7 V

12. Disconnect the X1 harness connector at the K84 Keyless Entry Control Module.

13. Test for infinite resistance between the signal circuit terminal 11 and ground.

If less than infinite resistance

Repair the short to ground on the circuit.

If infinite resistance

14. Vehicle in Service Mode.

15. Test for less than 1 V between the signal circuit terminal 11 and ground.

If 1 V or greater

Repair the short to voltage on the circuit.

If less than 1 V

16. Test for 4.5 - 5.5 k Ω between the signal circuit terminal 11 and the low reference circuit terminal 12, with

the S83 Vehicle On/Off Switch released.

If not between 4.5 - 5.5 k Ω

1. Vehicle OFF, disconnect the harness connector at the S83 Vehicle On/Off Switch.

2. Test for less than 2 Ω in the signal circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, test or replace the S83 Vehicle On/Off Switch.

If between 4.5 - 5.5 k Ω

17. Test for 1 - 1.5 k Ω between the signal circuit terminal 11 and the low reference circuit terminal 12, with the S83 Vehicle On/Off Switch pressed.

If not between 1 - 1.5 k Ω

Test or replace the S83 Vehicle On/Off Switch.

If between 1 - 1.5 k Ω

18. Replace the K84 Keyless Entry Control Module.

Component Testing

Ignition Mode Switch Test

1. Vehicle OFF, disconnect the harness connector at the S83 vehicle ON/OFF switch.

2. With the S83 vehicle ON/OFF switch released, test for 4.5 - 5.5 kΩ between the terminal listed below: Signal terminal 6 and ground terminal 4

Signal terminal 3 and low reference terminal 7

If not between 4.5 - 5.5 kΩ

Replace the S83 Vehicle On/Off Switch.

If between 4.5 - 5.5 kΩ

3. With the S83 Vehicle On/Off Switch pressed, test for 1 - 1.5k Ω between the terminals listed below: Signal terminal 6 and ground terminal 4

Signal terminal 3 and low reference terminal 7

If not between 1 - 1.5 kΩ

Replace the S83 Vehicle On/Off Switch.

If between 1 - 1.5 kΩ

4. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Ignition and Start Switch Replacement

Control Module References for the appropriate control module replacement, programming and setup.

GENERAL ELECTRICAL DIAGNOSIS

Basic Knowledge Required

Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in the service manual. You should understand the basic theory of electricity, and know the meaning of voltage (V), current (A), and resistance (Ω). You should also be able to read and understand a wiring diagram, as well as understand what happens in a circuit with an open or a shorted wire.

CHECKING AFTERMARKET ACCESSORIES

WARNING: Refer to SIR Warning .

Do not connect aftermarket accessories into the SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol.

Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems.

Possible causes of vehicle problems related to aftermarket accessories include: Power feeds connected to points other than the battery

Antenna location

Transceiver wiring located too close to vehicle electronic modules or wiring Poor shielding or poor connectors on antenna feed line

Check for recent service bulletins detailing installation guidelines for aftermarket accessories.

CIRCUIT TESTING

The Circuit Testing section contains the following diagnostic testing information. Using this information along with the diagnostic procedures will identify the cause of the electrical malfunction.

Using Connector Test Adapters Probing Electrical Connectors

Troubleshooting with a Digital Multimeter Troubleshooting with a Test Lamp

Using Fused Jumper Wires Measuring Voltage

Measuring Voltage Drop Measuring Frequency

Testing Ground and Low Reference Circuits Testing for Continuity

Testing for Short to Ground Testing for a Short to Voltage

Testing for Intermittent Conditions and Poor Connections Inducing Intermittent Fault Conditions

Testing for Electrical Intermittents Scan Tool Snapshot Procedure

Circuit Protection - Fuses

Circuit Protection - Circuit Breakers Circuit Protection - Fusible Links

USING CONNECTOR TEST ADAPTERS

Special Tools

EL-35616 Terminal Test Probe Kit

For equivalent regional tools, refer to Special Tools .

WARNING: This procedure should not be performed on high voltage circuits. Performing this procedure on high voltage circuits may result in serious injury or death.

CAUTION: Do not insert test equipment probes (DMM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616-F GM Approved Terminal Release Tool Kit in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals.

When using the J-35616-F GM Approved Terminal Release Tool Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616-F GM Approved Terminal Release Tool Kit label on the inside of the J-35616-F GM Approved Terminal Release Tool Kit for the correct adapter along with the connector end view for terminal size.

PROBING ELECTRICAL CONNECTORS

Special Tools

EL-35616 Terminal Test Probe Kit

For equivalent regional tools, refer to Special Tools .

WARNING: This procedure should not be performed on high voltage circuits. Performing this procedure on high voltage circuits may result in serious injury or death.

NOTE: Always be sure to reinstall the connector position assurance (CPA) and terminal position assurance (TPA) when reconnecting connectors or replacing terminals.

Front probe

Disconnect the connector and probe the terminals from the mating side (front) of the connector.

CAUTION: Refer to Test Probe Caution .

NOTE: When probing female 0.64 terminals, it is important to use the correct adapter.

There have been some revisions to the test adapter for 0.64 terminals. The proper adapter for 0.64 terminals is the J-35616-64B which has a gold terminal and a black wire between the base and tip. Failure to use the proper test adapter may result in damage to the terminal being tested and improper diagnosis.

NOTE: The proper adapter for probing the terminals for fuses, relays, or diodes in an electrical center is J-35616-35. Using any other tool or adapter may damage the terminal being tested.

Refer to the following table as a guide in selecting the correct test adapter for front probing connectors:

Backprobe

NOTE: Backprobe connector terminals only when specifically required in diagnostic procedures.

Do not backprobe a sealed (Weather Pack®) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire connector.

Backprobing can be a source of damage to connector terminals. Use care in order to avoid deforming the terminal, either by forcing the test probe too far into the cavity or by using too large of a test probe.

After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact.

Do not disconnect the connector and probe the terminals from the harness side (back) of the connector.

TROUBLESHOOTING WITH A DIGITAL MULTIMETER

Special Tools

EL-39200 Digital Multimeter (DMM)

For equivalent regional tools, refer to Special Tools .

WARNING: High voltage circuits should only be tested using a digital multimeter (DMM) and test leads with at least a CAT III rating, such as the J 39200-A Digital Multimeter. Failure to follow the procedures may result in serious injury or death.

CAUTION: Refer to Test Probe Caution .

Digital Multimeter (DMM) Basic Requirements

Service information is validated using digital multimeters that meet or exceed the following requirements. Using a multimeter that does not meet these basic requirements may give inaccurate readings which could lead to an incorrect diagnosis.

Display and Settings

1. Four digits displayed

2. Voltage, current, resistance, frequency, diode test settings, and min-max function

3. Display positive and negative values

Voltage

1. Have at least 10 M Ω input impedance

2. Test a DC voltage range of 0.1 - 1000 V.

3. Test an AC voltage range of 0.1 - 1000 V.

Current

1. Test a DC current range of 0.1μA - 10 A.

2. Test an AC current range of 0.1μA - 10 A.

Resistance

Test a resistance range of 0.1 Ω - 40 MΩ and displays infinite for a value greater than 40 M Ω (O.L. (Over- load))

Frequency

Test for a frequency range of 0.5 HZ - 199 K HZ

Diode Test

1. Apply at least 2 mA when performing the diode bias test

2. Display the break over voltage drop (0 - 3 V) of a forward biased diode

3. Display infinite (O.L. (Over-load)) when a diode is reverse biased

Min-Max Readings

1. Can update at a 25 ms sample rate

2. Saves and displays minimum and maximum values

NOTE: Circuits which include any solid state control modules, such as the engine control module (ECM), should only be tested with a 10 megohm or higher impedance digital multimeter such as the EL-39200.

The DMM instruction manual is a good source of information and should be read thoroughly upon receipt of the DMM as well as kept on hand for future reference.

A DMM should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present if the impedance is low enough, a DMM indicates how much voltage is present. In other words, if there is not enough current, the test lamp will not illuminate even though voltage is present.

The ohmmeter function on a DMM shows how much resistance exists between 2 points along a circuit. Low resistance in a circuit means good continuity.

NOTE: Disconnect the power feed from the suspect circuit when measuring resistance with a DMM. This prevents incorrect readings. DMMs apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading.

Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take a reading once, then reverse the leads and take a second reading. If

the readings differ the solid state component is affecting the measurement.

Following are examples of the various methods of connecting the DMM to the circuit to be tested:

Probe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors .

Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses.

If the system that is being diagnosed has a specified pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit or for testing multiple circuits quickly.

TROUBLESHOOTING WITH A TEST LAMP

Special Tools

EL-35616-200 Test Light - Probe Kit

For equivalent regional tools, refer to Special Tools .

WARNING: This procedure should not be performed on high voltage circuits. Performing this procedure on high voltage circuits may result in serious injury or death.

CAUTION: Refer to Test Probe Caution .

A test lamp can simply and quickly test a low impedance circuit for voltage. A digital multimeter (DMM) should be used instead of a test lamp in order to test for voltage in high impedance circuits. While a test lamp shows whether voltage is present if the impedance is low enough, a DMM indicates how much voltage is present. In other words, if there is not enough current, the test lamp will not illuminate even though voltage is present.

The EL-35616-200 kit is Micro-Pack compatible and comprised of a 12 V light bulb with an attached pair of leads.

To properly operate this tool use the following procedures. When testing for voltage:

1. Attach one lead to ground.

2. Touch the other lead to various points along the circuit where voltage should be present.

3. When the bulb illuminates, there is voltage at the point being tested. When testing for ground:

1. Attach one lead to battery positive voltage.

2. Touch the other lead to various points along the circuit where ground should be present.

3. When the bulb illuminates, there is ground at the point being tested.

USING FUSED JUMPER WIRES

Special Tools

EL 35616-20F Fused Jumper Wire

For equivalent regional tools, refer to Special Tools .

NOTE: A fused jumper may not protect solid state components from being damaged.

Fig. 1: Fused Jumper Wire

Courtesy of GENERAL MOTORS COMPANY

The EL 35616-20F Fused Jumper Wire includes banana jack connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a 20 A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested.

MEASURING VOLTAGE

Special Tools

EL-39200 Digital Multimeter (DMM)

For equivalent regional tools, refer to Special Tools .

WARNING: Before working on any high voltage system, be sure to wear the following

Personal Protection Equipment:

Safety glasses with appropriate side shields when within 50 feet of the vehicle, either indoors or outdoors

Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors

Visually and functionally inspect the gloves before use.

Wear the Insulation gloves at all times when working with the high voltage battery assembly, whether the system is energized or not.

Failure to follow the procedure exactly as written may result in serious injury or death.

CAUTION: Refer to Test Probe Caution .

The following procedure measures the voltage at a selected point in a circuit.

1. Disconnect the electrical harness connector for the circuit being tested, if necessary.

2. Enable the circuit and/or system being tested. Use the following methods: Vehicle power mode to Vehicle in Service Mode or Vehicle On.

Turn ON the circuit and/or system with a scan tool in Output Controls. Turn ON the switch for the circuit and/or system being tested.

3. Select the V (AC) or V (DC) position on the digital multimeter (DMM).

4. Connect the positive lead of the DMM to the point of the circuit to be tested.

5. Connect the negative lead of the DMM to a good ground.

6. The DMM displays the voltage measured at that point.

MEASURING VOLTAGE DROP

Special Tools

EL - 39200 Digital Multimeter (DMM)

For equivalent regional tools, refer to Special Tools .

CAUTION: Refer to Test Probe Caution .

The following procedure determines the difference in voltage potential between 2 points.

Fig. 2: Measuring Voltage Drop

Courtesy of GENERAL MOTORS COMPANY

1. Set the Digital Multimeter (DMM) to the V (DC) position.

2. Connect the positive lead of the DMM to one point of the circuit to be tested.

3. Connect the negative lead of the DMM to the other point of the circuit.

4. Operate the circuit.

5. The DMM displays the difference in voltage between the 2 points.

MEASURING FREQUENCY

Special Tools

EL - 39200 Digital Multimeter (DMM)

For equivalent regional tools, refer to Special Tools .

CAUTION: Refer to Test Probe Caution .

The following procedure determines the frequency of a signal.

NOTE: Connecting the Digital Multimeter (DMM) to the circuit before pressing the Hz button will allow the DMM to autorange to an appropriate range.

1. Apply power to the circuit.

2. Set the DMM to the V (AC) position.

3. Connect the positive lead of the DMM to the circuit to be tested.

4. Connect the negative lead of the DMM to a good ground.

5. Set to Hz on the DMM.

6. The DMM will display the frequency measured.

TESTING GROUND AND LOW REFERENCE CIRCUITS

Because a test lamp can light with up to 200 Ω in a ground or low reference circuit they are not recommended to be used for this type of test. A low impedance test lamp can light and indicate the circuit is good when there is as much as 20 - 30 Ω present, while a high impedance test lamp can light with up to 200 Ω present in the circuit. This is why the Digital Multi-Meter (DMM) is used when validating a ground or low reference circuit continuity.

When using the DMM there are many vehicle conditions that can affect the ground and low reference continuity testing. If these conditions are not met, a ground or low reference circuit test can fail on a good circuit. This may cause longer diagnosis time and incorrect component replacement.

Any current flow through a ground or low reference circuit, while being tested, will skew the DMM continuity reading, or display a reading higher than when there is no current flowing. Performing a ground or low reference circuit continuity test, in reference to the vehicles battery negative terminal, will have the highest risk of failing a good ground or low reference circuit test than any other ground reference point. The best ground test points would be a control module housing (if the control modules housing is metal and grounded), door jamb striker (if attached to metal), under dash metal frame work, engine block, or body ground studs (other than where the negative battery cable is attached).

A typical DMM ground or low reference circuit continuity reading can be as high as 100 Ω with the vehicle power mode in Vehicle ON or Vehicle in Service Mode, and drop to 15 - 25 Ω after switching the vehicle off. The reading will drop below 10 Ω after 30 - 40 s, then below 5 Ω after 60 s. Once the vehicle completely goes to sleep (generally 3-10 min) the reading will drop below 0.3 Ω.

The following list of conditions may need to be met to ensure a valid continuity reading on a ground or low reference circuit:

Vehicle off

Transmitter out of range of the vehicle

Retained Accessory Power off (open and close the driver door after vehicle off) Battery charger set at a 2 A or less charge rate

Scan tool not communicating with any vehicle control module (in some cases it may need to be disconnected from the DLC)

All entry doors closed

Headlamps off(auto headlamps disabled) Any delay lighting off

HVAC after blow off

Any accessory that can work when the vehicle power mode is Vehicle OFF Wait up to 60 s (after all other listed conditions are met)

Locking the doors with a remote transmitter can greatly reduce the time to achieve a valid ground or low reference continuity test result.

There are some low reference circuits that use a driver to isolate the circuit while the ignition is off. This is done in most cases for accidental reverse battery connections or reverse polarity jump starting. When this driver is present, the ignition will need to be on to validate the circuit.

TESTING FOR CONTINUITY

Special Tools

EL-39200 Digital Multimeter (DMM)

For equivalent regional tools, refer to Special Tools .

WARNING: This procedure should not be performed on high voltage circuits. Performing this procedure on high voltage circuits may result in serious injury or death.

CAUTION: Refer to Test Probe Caution .

The following procedures verify good continuity in a circuit.

With a Digital Multimeter (DMM)

1. Set the DMM to the Ω position.

2. Disconnect the power feed (i.e. fuse, control module) from the suspect circuit.

3. Disconnect the load.

4. Select the MIN MAX function on the DMM.

5. Connect one lead of the DMM to one end of the circuit to be tested.

6. Connect the other lead of the DMM to the other end of the circuit.

7. If the DMM displays low or no resistance, the circuit has good continuity.

With a Test Lamp

NOTE: Only use the test lamp procedure on low impedance power and ground circuits.

1. Remove the power feed (i.e. fuse, control module) from the suspect circuit.

2. Disconnect the load.

3. Connect one lead of the test lamp to one end of the circuit to be tested.

4. Connect the other lead of the test lamp to battery positive voltage.

5. Connect the other end of the circuit to ground.

6. If the test lamp illuminates (full intensity), then the circuit has good continuity.

TESTING FOR SHORT TO GROUND

WARNING: This procedure should not be performed on high voltage circuits. Performing this procedure on high voltage circuits may result in serious injury or death.

CAUTION: Refer to Test Probe Caution .

The following procedures test for a short to ground in a circuit.

With a Digital Multimeter (DMM)

1. Remove the power feed (i.e. fuse, control module) from the suspect circuit.

2. Disconnect the load.

3. Set the rotary dial of the DMM to the Ω position.

4. Connect one lead of the DMM to one end of the circuit to be tested.

5. Connect the other lead of the DMM to a good ground.

6. If the DMM does NOT display infinite resistance (OL), there is a short to ground in the circuit.

With a Test Lamp

1. Remove the power feed (i.e. fuse, control module) from the suspect circuit.

2. Disconnect the load.

3. Connect one lead of the test lamp to battery positive voltage.

4. Connect the other lead of the test lamp to one end of the circuit to be tested.

5. If the test lamp illuminates, there is a short to ground in the circuit.

Fuse Powering Several Loads

1. Review the system schematic and locate the fuse that is open.

2. Open the first connector or switch leading from the fuse to each load.

3. Connect a DMM across the fuse terminals (be sure that the fuse is powered).

When the DMM displays voltage the short is in the wiring leading to the first connector or switch. If the DMM does not display voltage refer to the next step.

4. Close each connector or switch until the DMM displays voltage in order to find which circuit is shorted.

TESTING FOR A SHORT TO VOLTAGE

Special Tools

EL-39200 Digital Multimeter (DMM)

For equivalent regional tools, refer to Special Tools .

WARNING: This procedure should not be performed on high voltage circuits. Performing this procedure on high voltage circuits may result in serious injury or death.

CAUTION: Refer to Test Probe Caution .

The following procedure tests for a short to voltage in a circuit.

1. Remove the power feed (i.e. fuse, control module) from the suspect circuit.

2. Disconnect the load.

3. Set the digital multimeter (DMM) to the V (DC) position.

4. Connect the positive lead of the DMM to one end of the circuit to be tested.

5. Connect the negative lead of the DMM to a good ground.

6. Switch the vehicle power mode to Vehicle in Service Mode and operate all accessories.

7. If the voltage measured is greater than 1 V, there is a short to voltage in the circuit.

TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS

Special Tools

EL-35616 Terminal Test Probe Kit

For equivalent regional tools, refer to Special Tools .

WARNING: This procedure should not be performed on high voltage circuits. Performing this procedure on high voltage circuits may result in serious injury or death.

When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition before trying to locate an intermittent condition.

Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items:

Wiring broken inside the insulation

Poor connection between the male and female terminal at a connector

Poor terminal to wire connection - Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc.

Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits.

Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle.

Wiring that comes in contact with hot or exhaust components

Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern.

Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions.

Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation.

Testing for Terminal Fretting

Some intermittent conditions can be caused by wire terminal fretting corrosion. Fretting corrosion is a build-up of insulating, oxidized wear debris that can form when there is a small motion between electrical contacts. The oxidized wear debris can pile up enough at the electrical contact spots that the electrical resistance across the

connection increases. Movement between the contacting surfaces as small as 10 to 100 microns can cause fretting. To put this in perspective, a sheet of paper is about 100 microns thick, so fretting motion is small and hard to see. Vibration and thermal expansion/contraction are the main sources that create fretting motion. Since vehicles vibrate and can experience large temperature swings, they are a good source for fretting motion. Tin, copper, nickel, and iron surfaces are all susceptible to fretting corrosion. Fretting corrosion can be difficult to see but it looks like small, dark smudges on the terminals contact surface.

To correct a fretting condition disconnect the suspect connector and add dielectric grease / lubricant (Nyogel 760G or equivalent, meeting GM specification 9986087) to both sides of the connector terminals. Then reconnect the connector and wipe away any excess lubricant. This will correct the additional terminal contact resistance due to the terminal fretting corrosion.

Testing for Proper Terminal Contact

It is important to test terminal contact at the component and any inline connectors before replacing a suspect component. Mating terminals must be inspected to ensure good terminal contact. A poor connection between the male and female terminal at a connector may be the result of contamination or deformation.

Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit.

Deformation is caused by probing the mating side of a connector terminal without the proper adapter. Always use the EL-35616 kit when probing connectors. Other causes of terminal deformation are improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit.

Testing for Proper Terminal Contact in Bussed Electrical Centers (BEC)

It is very important to use the correct test adapter when testing for proper terminal contact of fuses and relays in a bussed electrical center (BEC). Use EL-35616 kit to test for proper terminal contact. Failure to use EL-35616 kit can result in improper diagnosis of the bussed electrical center.

Follow the procedure below in order to test terminal contact:

1. Separate the connector halves.

2. Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body.

3. Using an equivalent male terminal/terminated lead, verify that the retention force is significantly different between a known good terminal and the suspect terminal. Replace the female terminal in question.

Flat Wire Connectors

There are no serviceable parts for flat wire connectors on the harness side or the component side. Follow the procedure below in order to test terminal contact:

1. Remove the component in question.

2. Visually inspect each side of the connector for signs of contamination. Avoid touching either side of the

connector as oil from your skin may be a source of contamination as well.

3. Visually inspect the terminal bearing surfaces of the flat wire circuits for splits, cracks, or other imperfections that could cause poor terminal contact. Visually inspect the component side connector to ensure that all of the terminals are uniform and free of damage or deformation.

4. Insert the appropriate adapter from the on the flat wire harness connector in order to test the circuit in question.

Control Module/Component Voltage and Grounds

Poor voltage or ground connections can cause widely varying symptoms.

Test all control module voltage supply circuits. Many vehicles have multiple circuits supplying voltage to a control module. Other components in the system may have separate voltage supply circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the voltage source and the module/component. A test lamp or a DMM may indicate that voltage is present, but neither tests the ability of the circuit to carry sufficient current.

Operate the component to test the ability of the circuit to carry sufficient current. Refer to Circuit Testing, and Power Distribution Schematics .

Test all control module ground and system ground circuits. The control module may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested.

Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Operate the component to test the ability of the circuit to carry sufficient current. Refer to Circuit Testing, and Ground Distribution Schematics .

Temperature Sensitivity

An intermittent condition may occur when a component/connection reaches normal operating temperature. The condition may occur only when the component/connection is cold, or only when the component/connection is hot.

Freeze Frame, Failure Records, Snapshot, or Vehicle Data Recorder data may help with this type of intermittent condition, where applicable.

If the intermittent is related to heat, review the data for a relationship with the following: High ambient temperatures

Underhood/engine generated heat

Circuit generated heat due to a poor connection, or high electrical load Higher than normal load conditions, towing, etc.

If the intermittent is related to cold, review the data for the following:

Low ambient temperatures - In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion.

The condition only occurs on a cold start.

The condition goes away when the vehicle warms up.

Information from the customer may help to determine if the trouble follows a pattern that is temperature related.

If temperature is suspected of causing an intermittent fault condition, attempt to duplicate the condition.

Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required.

Electromagnetic Interference and Electrical Noise

Some electrical components/circuits are sensitive to electromagnetic interference (EMI) or other types of electrical noise. Inspect for the following conditions:

A mis-routed harness that is too close to high voltage/high current devices such as secondary ignition components, motors, generator, etc. - These components may induce electrical noise on a circuit that could interfere with normal circuit operation.

Electrical system interference caused by a malfunctioning relay, or a control module driven solenoid or switch - These conditions can cause a sharp electrical surge. Normally, the condition will occur when the malfunctioning component is operating.

Improper installation of non-factory or aftermarket add on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones, etc. - These accessories may create interference in other circuits while operating and the interference would disappear when the accessory is not operating. Refer to Checking Aftermarket Accessories .

Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode.

The generator may be allowing AC noise into the electrical system.

Incorrect Control Module

There are only a few situations where reprogramming a control module is appropriate: A new service control module is installed.

A control module from another vehicle is installed.

Revised software/calibration files have been released for this vehicle.

NOTE: DO NOT re-program the control module with the SAME software/calibration files that are already present in the control module. This is not an effective repair for any type of concern.

Verify that the control module contains the correct software/calibration. If incorrect programming is found, reprogram the control module with the most current software/calibration. Refer to Control Module References for replacement, setup, and programming.

INDUCING INTERMITTENT FAULT CONDITIONS

Special Tools

EL-25070 Heat Gun

For equivalent regional tools, refer to Special Tools .

WARNING: Before working on any high voltage system, be sure to wear the following Personal Protection Equipment:

Safety glasses with appropriate side shields when within 50 feet of the vehicle, either indoors or outdoors

Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors

Visually and functionally inspect the gloves before use.

Wear the Insulation gloves at all times when working with the high

voltage battery assembly, whether the system is energized or not.

Failure to follow the procedure exactly as written may result in serious injury or death.

Many intermittent open or shorted circuits are affected by harness/connector movement that is caused by vibration, torque, bumps/rough pavement, etc. In order to duplicate the customer's concern, it may be necessary to manipulate the wiring harness if the malfunction appears to be vibration related. Manipulation of a circuit can consist of a wide variety of actions, including:

Wiggling the harness

Disconnecting a connector and reconnecting

Stressing the mechanical connection of a connector

Pulling on the harness or wire in order to identify a separation/break inside the insulation Relocating a harness or wires

All these actions should be performed with some goal in mind. For instance, with a scan tool connected, wiggling the wires may uncover a faulty input to the control module. The snapshot option would be appropriate here. Refer to Scan Tool Snapshot Procedure. Another option is, with the component commanded ON and OFF by the scan tool, to move related connectors and wiring and observe the component operation. With the vehicle ON, move related connectors and wiring while monitoring vehicle operation. If harness or connector movement affects the data displayed, component/system operation, or vehicle operation, inspect and repair the harness/connections as necessary.

You may need to load the vehicle in order to duplicate the concern. This may require the use of weights, floor jacks, jackstands, frame machines, etc. In these cases you are attempting to duplicate the concern by manipulating the suspension or frame. This method is useful in finding harnesses that are too short and their connectors pull apart enough to cause a poor connection. A DMM set to the Min/Max mode and connected to the suspect circuit while testing can yield desirable results. Refer to Testing for Electrical Intermittents.

Certainly, using the senses of sight, smell, and hearing while manipulating the circuit can provide good results as well.

There may be instances where circuit manipulation alone will not meet the required criteria for the fault condition to appear. In such cases it may be necessary to expose the suspect circuit to other conditions while manipulating the harness. Such conditions would include high moisture conditions, along with exceptionally high or low temperatures. The following discusses how to expose the circuit to these kinds of conditions.

High Temperature Conditions

If the complaint tends to be heat related, you can simulate the condition using the EL-25070 heat gun.

Using the heat gun, you can heat up the suspected area or component. Manipulate the harnesses under high temperature conditions while monitoring the scan tool or DMM to locate the fault condition.

The high temperature condition may be achieved simply by test driving the vehicle at normal operating temperature. If a heat gun is unavailable, consider this option to enhance your diagnosis. This option does not allow for the same control, however.

Low Temperature Conditions

Depending on the nature of the fault condition, placing a fan in front of the vehicle while the vehicle is in the

shade can have the desired effect.

If this is unsuccessful, use local cooling treatments such as ice or a venturi type nozzle (one that provides hot or cold air). This type of tool is capable of producing air stream temperatures down to -18°C (0°F) from one end and +71°C (160°F) from the other. This is ideally suited for localized cooling needs. In addition, circuit cooling spray can be used to cool down a component or circuit.

Once the vehicle, component, or harness has been sufficiently cooled, manipulate the harness or components in an effort to duplicate the concern.

Duplicating Failure Conditions

If none of the previous tests are successful, attempt to duplicate and/or capture the failure conditions.

Freeze Frame/Failure Records data, where applicable, contains the conditions that were present when the DTC set.

1. Review and record Freeze Frame/Failure Records data.

2. Clear the DTCs using the scan tool.

3. Switch the vehicle power mode to Vehicle Off and wait 15 seconds.

4. Operate the vehicle under the same conditions that were noted in Freeze Frame/Failure Records data, as closely as possible. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text if a DTC is being diagnosed.

5. Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran, when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC passed or failed.

An alternate method is to drive the vehicle with the DMM connected to a suspected circuit. An abnormal reading on the DMM when the concern occurs, may help you locate the concern.

TESTING FOR ELECTRICAL INTERMITTENTS

Special Tools

EL-39200 Digital Multimeter (DMM)

For equivalent regional tools, refer to Special Tools .

WARNING: This procedure should not be performed on high voltage circuits. Performing this procedure on high voltage circuits may result in serious injury or death.

Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching the test equipment.

Testing for Short to Ground Testing for Continuity

Testing for a Short to Voltage

If the fault is not identified, perform the procedure below using the MIN MAX feature on the EL-39200 DMM. This feature allows you to manipulate the circuit without having to watch the DMM. The DMM will generate an audible tone when a change is detected.

NOTE: The DMM must be used in order to perform the following procedure since the DMM can monitor current, resistance or voltage while recording the minimum (MIN), and maximum (MAX) values measured.

1. Connect the DMM to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other. Refer to Troubleshooting with a Digital Multimeter for information on connecting the DMM to the circuit.

2. Set the rotary dial of the DMM to the V (AC) or V (DC) position.

3. Press the range button of the DMM in order to select the desired voltage range.

NOTE: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change.

4. Select the MIN MAX function of the DMM. The DMM displays the 100 ms RECORD and emits an audible tone (beep).

5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or performing other operations. Refer to Inducing Intermittent Fault Conditions.

6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded.

7. Press the MIN MAX button until the MAX value is displayed and note the value.

8. Press the MIN MAX button until the MIN value is displayed and note the value.

9. Determine the difference between the MIN and MAX values.

If the variation between the recorded MIN and MAX voltage values is 1 V or greater an intermittent open or high resistance condition exists. Repair the condition as necessary.

If the variation between the recorded MIN and MAX voltage values is less than 1 V an intermittent open or high resistance condition does not exist.

SCAN TOOL SNAPSHOT PROCEDURE

Reviewing Stored Data in Global Diagnostic System (GDS)

Overview

A snapshot is a recording of what a control module on the vehicle was receiving for information while the snapshot is being made. A snapshot is used to analyze the data during the time a vehicle condition is current. In GDS 2 there is not a traditional snapshot as there has been in the past. GDS 2 saves all past VIN and diagnostic data for future viewing. GDS 2 automatically records data whenever the user views Module Diagnostics, Vehicle Diagnostics and/or Systems Diagnostics. Module Diagnostics includes DTC Data, Identification Information, Data Display, Control Functions and Configuration/Reset Functions. Vehicle Diagnostics includes Vehicle Wide DTCs. Systems Diagnostics includes Inspection/Maintenance Status and Inspection/Maintenance Information.

Reviewing Stored Data

The Review Stored Data function allows viewing and playing of previously recorded vehicle data. This information can be used in analysis of vehicle problems and detection of trigger error conditions. The graph function can be used to compare multiple parameters to see if a component is functioning properly. Recorded sessions can be selected for viewing by the following two methods:

From the Home Page, click on Review Stored Data. In the Review Stored Data page, highlight a vehicle in the Sessions screen located in the upper pane and highlight the desired Stored Data in the lower pane, then click the Review button.

The user can view stored data without ending a current on-vehicle diagnostic session by clicking the Vehicle Menu button (when active) or Back button until the Session Manager is displayed in the menu. This is used when a user is viewing live data and wants the quickest way to review the data. Click on the Session Manager button. Highlight the desired Stored Data in the lower pane and click the Review button.

Stored Data Review Selections

The following information can be selected in the tabs at the top of the screen:

Graphical Data Display - Allows a detailed review of parameter data. The buttons on the right side modify the graph data

Diagnostic Data Display - Displays incoming information from the file. The current value of the parameters is displayed on the screen.

Line Graph - Allows selected locked parameters to be graphed with parameters overlaid for data comparison. The current value of the parameters is displayed on the screen. Use the buttons on the right side to modify the graph data.

Bookmarks - If bookmarks are present, this displays the Type, Description and Time of automatic and manually generated bookmarks.

System Information - Displays the GDS 2 Software Version and MDI Serial Number used when the session was recorded.

Selected Vehicle Configuration - Displays vehicle identifiers, such as transmission type, for the vehicle selected on the Stored Data Review screen in the Sessions field.

RPO - Displays vehicle build information.

Graphical Data Display

On the Graphical Data Display tab there are multiple selections at the top of the page. The selections available are:

Create Report - Opens and internet browser page where a data display report can be printed or saved for future reference.

Unit Switch - Toggles graph units between English and metric.

Lock - When a parameter is selected, clicking the lock button locks a selected parameter for viewing in the Line Graph tab. In the Line Graph tab, locked parameters are isolated and overlaid for data comparison.

Up Arrow - Click the up arrow to move a highlighted parameter up a position on the list.

Down Arrow - Click the down arrow to move a highlighted parameter down a position on the list.

Save As - This selection is available in the Graphical Data Display and Diagnostic Data Display tabs.

This allows the user to export the graph data to a worksheet for in depth analysis and to timestamp data.

Review Stored Data Functions

To review the session there are buttons at the bottom of the window to control the cursor. From left to right the buttons are:

Insert Bookmark - This button allows the user to insert bookmarks anywhere along the timeline. This

provision allows the user to record notes regarding the inserted bookmark.

Return Bookmark - This button moves the cursor to the previous bookmark. Back - This button moves the cursor back 1 frame.

Timeline Slider Control - This allows the user to slide and select any position on the Timeline required. Forward - This button moves the cursor forward 1 frame.

Forward Bookmark - This button moves the cursor forward 1 bookmark. Bookmarks - Allows the user to toggle bookmark visibility ON and OFF.

Graphical Preference Selections

The vertical side bar on the right side of the screen in the Graphical Data Display and Line Graph tabs toggles the Graphical Selection Panel from hidden to visible. The graphical preference selections available are:

Reset - Resets the graph display back to the initial standard GDS 2 setting.

Grid Line Toggle - This toggle reverses the current state of showing or removing grid lines.

Hash Mark Toggle - This toggle reverses the current state of showing or removing data acquisition points or hash marks.

Horizontal Graph Compression - Compresses the scale of the graph horizontally. Horizontal Graph Expansion - Expands the scale of the graph horizontally.

Vertical Graph Compression - Compresses the scale of the graph vertically. Vertical Graph Expansion - Expands the scale of the graph vertically.

Move Centerline of Graph Up - Moves the centerline of the graph up incrementally.

Move Centerline of Graph Down - Moves the centerline of the graph down incrementally.

CIRCUIT PROTECTION - FUSES

Special Tools

EL - 39200 Digital Multimeter (DMM)

For equivalent regional tools, refer to Special Tools .

Fig. 3: Identifying Open Fuse Element Courtesy of GENERAL MOTORS COMPANY

The fuse is the most common method of an automotive wiring circuit protection. Whenever there is an excessive amount of current flowing through a circuit the fusible element will melt and create an open or incomplete circuit. Fuses are a one time protection device and must be replaced each time the circuit is overloaded. To determine if a fuse is open, remove the suspected fuse and examine if the element in the fuse is broken (2). If not broken (1), also check for continuity using a Digital Multimeter (DMM) or a continuity tester. If the element is broken or continuity is suspect, replace the fuse with one of equal current rating.

Fuse Types

CIRCUIT PROTECTION - CIRCUIT BREAKERS

A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short or other type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. Two types of circuit breakers are used.

Circuit Breaker

This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause of the high current is still present, it will open again. The circuit breaker will continue to cycle open and closed until the condition causing the high current is removed.

Positive Temperature Coefficient (PTC) Circuit Breaker

This type greatly increases its resistance when excessive current passes through it. The excessive current heats the PTC device, as the device heats its resistance increases. Eventually the resistance gets so high that the circuit is effectively open. Unlike the ordinary circuit breaker the PTC unit will not reset until the circuit is opened, by removing the voltage from its terminals. Once the voltage is removed the circuit breaker will re-close within a second or 2.

CIRCUIT PROTECTION - FUSIBLE LINKS

Special Tools

EL - 39200 Digital Multimeter (DMM)

For equivalent regional tools, refer to Special Tools .

NOTE: When repairing a fusible link, fusible links cut longer than 225 mm (approximately 9 in) will not provide sufficient overload protection.

Fusible link is wire designed to melt and break continuity when excessive current is applied. It is often located between or near the battery and starter or electrical center. Use a continuity tester or a Digital Multimeter (DMM) at each end of the wire containing the fusible link in order to determine if it is broken. If broken, it must be replaced with fusible link of the same gauge size.

WIRING REPAIRS

The Wiring Repairs section contains the following types of wiring repair information. Using these elements together will make wiring repair faster and easier:

Flat Wire Repairs

Serial Data Circuit Wiring Repairs High Temperature Wiring Repairs

Heated Oxygen Sensor Wiring Repairs Wire to Wire Repair

Splicing Inline Harness Diodes

Splicing Twisted or Shielded Cable SIR/SRS Wiring Repairs

CONNECTOR REPAIRS

Connector Repairs contains a list of all connector repairs. The connector repairs are listed by the connector manufacturer and then by connector type. If the technician cannot identify the manufacturer of the connector, refer to Identifying Connectors below. Knowing the connector manufacturer will assist in finding the correct connector repair from the following list:

Connector Position Assurance Locks Terminal Position Assurance Locks AFL/EPC Connectors

Bosch Connectors (BSK) Bosch Connectors (0.64) Bosch Connectors (2.8 JPT) Bosch Connectors (ECM)

Delphi Connectors (Weather Pack) Delphi Connectors (Push To Seat) Delphi Connectors (Pull To Seat) Delphi Connectors (Micro-Pack 100W) Delphi Connectors (Micro.64) Delphi Connectors (12- Way) Delphi Connectors (Steering Gear)

FCI Connectors (Lever Lock) FCI Connectors (SIR) FEP Connectors (Steering Gear)

JST Connectors

Kostal Connectors (Glow Plug Control Module) Kostal Connectors (Transmission) Molex Connectors (Lever Lock) Molex Connectors (SIR)

Sumitomo Connectors

Tyco/AMP Connectors (CM 42-Way) Tyco/AMP Connectors (Sensor) Tyco/AMP Connectors (0.25 Cap) Tyco/AMP Connectors (43-Way) Tyco/AMP Connectors (Door Module) Tyco/AMP Connectors (Seat) Tyco/AMP Connectors (102-Way Inline) Tyco/AMP Connectors (SIR)

Yazaki Connectors (2-Way) Yazaki Connectors (16-Way)

Repairing Connector Terminals (Terminated Lead Repair) Repairing Connector Terminals (Terminal Repair)

Connector Anatomy

Fig. 4: Identifying Typical Connector Components Courtesy of GENERAL MOTORS COMPANY

Identifying Connectors

Knowing the connector manufacturer is helpful when trying to locating the correct connector repair procedure. There are many different connector designs used on GM vehicles and it is sometimes difficult to identify the connector manufacturer. The information in this document should help with the identification of connector manufactures.

The following connector manufacturers make most of the connectors found in GM vehicles: AFL/EPC (Alcoa Fujikura Ltd./Engineered Plastics Components)

Bosch Delphi

FCI (Framatome Connectors International) JAE (Japan Aviation Electronics)

JST (Japan Solderless Terminals) Kostal

Molex

Sumitomo Tyco/AMP Yazaki

Identifying the manufacturer of a connector is often difficult. When trying to determine the manufacturer of a connector, look for specific identifying marks that are unique to that connector supplier. Most of these identify marks are hard to find or see. Check the connector carefully and refer to the information below for pictures and descriptions of connector identification markings.

Fig. 5: View Of EPC Identification On Connector Body Courtesy of GENERAL MOTORS COMPANY

Most of AFL's connectors have EPC on their connector body. Some of the smaller connectors will not have any markings on them.

Fig. 6: View Of Bosch Identification On Connector Body Courtesy of GENERAL MOTORS COMPANY

In some cases Bosch will actually be printed on the connector. If Bosch does not appear on the connector, look for the Bosch logo. The Bosch logo is a circle with a blunted arrow inside. This logo can appear anywhere on the connector and is often very small.

Fig. 7: View Of PED Identification On Connector Body Courtesy of GENERAL MOTORS COMPANY

In some cases Delphi will actually be printed on the connector. If Delphi is not printed on the connector, look for PED. In both cases there is no specific orientation for Delphi or PED and they can appear anywhere on the connector.

Fig. 8: View Of FCI Identification On Connector Body Courtesy of GENERAL MOTORS COMPANY

FCI connectors may have the FCI logo on their connectors. The logo is the letters FCI with an "A" above it.

Fig. 9: View Of JAF Identification On Connector Body Courtesy of GENERAL MOTORS COMPANY

JAE connector have JAE in small letters on their connectors.

Fig. 10: View Of JST Identification On Connector Body Courtesy of GENERAL MOTORS COMPANY

JST connectors have JST in small letters on their connectors, similar to that above. The location of the logo will vary with the connector size and style.

Fig. 11: View Of Kostel Connector Identifier Courtesy of GENERAL MOTORS COMPANY

Kostel has an "LK" with a circle around it. These connector are usually used as a transmissions connection.

Fig. 12: View Of Molex Identification On Connector Body Courtesy of GENERAL MOTORS COMPANY

Fig. 13: View Of Sumitono Identification On Connector Body Courtesy of GENERAL MOTORS COMPANY

Most Molex connectors will have the Molex logo on the dresscover of the connector. In some cases the connectors may have MX followed by another letter. The third letter indicates where the connector was made. A connector with MXD is a Molex connector made in Detroit.

Sumitomo has a unique symbol on their connector and possibly a part number. The symbol is similar to that of a diamond lying on its side, similar to that shown. The logo could appear anywhere but the most common place is at the wire side of the housing.

Tyco/AMP has many different and unique connector designs. Some may or may not have identifiable marks on them.

Fig. 14: View Of Yazaki Identification On Connector Body Courtesy of GENERAL MOTORS COMPANY

Yazaki has a wedge or arrow shape, similar to that shown.

< Назад | Содержимое | Далее >