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‌SPECIFICATIONS‌

FASTENER SPECIFICATIONS

ELECTRICAL

12 V Starting and Charging - Volt

Reusable Threaded Fastener Tightening Specifications

SCHEMATIC WIRING DIAGRAMS

STARTING AND CHARGING WIRING SCHEMATICS

12V Battery Management

Fig. 1: 12V Battery Management

Courtesy of GENERAL MOTORS COMPANY

DIAGNOSTIC INFORMATION AND PROCEDURES

DTC B1325, B1330, B1517, C0800, C0899, C0900, C12E1, C12E2, P0561-P0563, P1A0C, P1A0D, OR P1EFC: DEVICE POWER CIRCUIT/BATTERY VOLTAGE/SYSTEM VOLTAGE/BATTERY/ ENERGY CONTROL MODULE SYSTEM

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 B1325 03

Device Power Circuit Voltage Below Threshold

DTC B1325 07

Device Power Circuit Voltage Above Threshold

DTC B1330 03

Device Power 2 Circuit Voltage Below Threshold

DTC B1330 04

Device Power 2 Circuit Voltage Open Circuit

DTC B1517 03

Battery Voltage Below Threshold

DTC B1517 07

Battery Voltage Above Threshold

DTC B1517 5A

Battery Voltage Plausibility Failure

DTC C0800 03

Device Power 1 Circuit Voltage Below Threshold

DTC C0800 07

Device Power 1 Circuit Voltage Above Threshold

DTC C0800 11

Device Power 1 Circuit High Input

DTC C0800 0D

Device Power 1 Circuit High Resistance

DTC C0899 00

Device Voltage Low

DTC C0899 03

Device Voltage Low

DTC C0900 00

Device Voltage High

DTC C0900 07

Device Voltage Above Threshold

DTC C12E1

Electronic Brake Control Module Supply Circuit Low Voltage

DTC C12E2

Electronic Brake Control Module Supply Circuit High Voltage

DTC P0561

System Voltage Performance

DTC P0562

System Voltage Low Voltage

DTC P0563

System Voltage High Voltage

DTC P1A0C

Battery Energy Control Module System Voltage Low Voltage

DTC P1A0D

Battery Energy Control Module System Voltage High Voltage

DTC P1EFC

Battery Charger Control Module System Voltage Low Voltage

Circuit/System Description

The vehicle control modules or sensors monitor the system voltage to verify the system voltage is within the normal operating range.

Conditions for Running the DTC

The vehicle is ON.

Conditions for Setting the DTC

The control module or sensor detects a system voltage of less than approximately 9 V or greater than 18 V for approximately 5 seconds.

Action Taken When the DTC Sets

A driver information center message and/or warning indicator may be displayed. The control module may be temporarily disabled.

Conditions for Clearing the DTC

The system voltage returns to normal operating range.

Diagnostic Aids

A high or low voltage DTC set or voltage value in multiple modules/sensors indicates a concern in the 12 V charging system.

A possible cause of this DTC could be overcharging with a 12 V battery charger or jump starting.

Reference Information

Schematic Reference

Control Module References

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Charging System 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. Ignition OFF, disconnect the drive motor battery charger cable from the X98 Hybrid/EV Battery Charger Receptacle.Measure and record the battery voltage at the battery terminals.

2. Verify the battery voltage stabilizes between 12.4 and 12.8 V within a few minutes of turning the ignition OFF.

If battery voltage is less than 12.4 V or more than 12.8 V

Refer to Battery Inspection/Test.

If battery voltage is between 12.4 and 12.8 V

3. Engine running, headlights ON, measure and record the battery voltage at the battery terminals.

4. Verify the voltage is at least 1 V greater than the voltage measured in step 1, but less than 15 V.

If the voltage is not at least 1 V greater than the voltage measured in step 1 or is greater than 15 V.

Refer to DC Power Conversion Test .

If the voltage is at least 1 V greater than the voltage measured in step 1, but less than 15 V.

5. Verify the appropriate control module battery voltage and ignition voltage parameters are available in the scan tool.

If parameters are not available in the scan tool

Refer to Circuit/System Testing

If parameters are available in the scan tool

6. Verify the appropriate control module scan tool battery voltage and ignition voltage parameters are within 1 V of the battery voltage.

If not within 1 V of the battery voltage

Refer to Circuit/System Testing

If within 1 V of the battery voltage

7. All OK.

Circuit/System Testing

NOTE: Use the schematic to identify the following:

Control modules the vehicle is equipped with

The control module's ground, B+, and Ignition circuit terminal IDs and connectors

NOTE: Some control module ground circuits may require up to 20 min after the ignition is turned off before achieving a resistance reading of less than 10 Ω. In most cases the readings will drop below 20 Ω within 1 min indicating the control module is going to sleep.

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connectors at the appropriate control module. It may take up to 2 min for all vehicle systems to power down.

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

If 10 Ω or greater

1. Ignition 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. If equipped, verify a test lamp illuminates between each B+ circuit terminal and ground.

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

1. Ignition OFF.

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. Ignition OFF.

2. Test for infinite resistance between the B+ circuit and ground.

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

If the test lamp illuminates

4. Ignition ON.

5. If equipped, verify a test lamp illuminates between each ignition circuit terminal and ground.

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

1. Ignition 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, 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. Ignition OFF.

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 appropriate control module.

If the test lamp illuminates

6. Replace the control module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for control module replacement, programming and setup

DTC B1516: BATTERY CURRENT SENSOR

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 B1516 08

Battery Current Sensor Signal Invalid

DTC B1516 66

Battery Current Sensor Wrong Mounting Position

Diagnostic Fault Information

Circuit/System Description

The battery current sensor is a 3-wire hall effect current sensor. The body control module (BCM) supplies 5 V and ground to the battery current sensor. The battery current sensor measures the amount of current flowing to or from the battery, and supplies a pulse width modulation (PWM) signal to the BCM.

Conditions for Running the DTC

B1516 08

The BCM is awake.

B1516 66

The BCM is awake. The engine is OFF.

Conditions for Setting the DTC

B1516 08

The battery current signal is less than 4 percent or greater than 96 percent duty cycle for 2 minutes.

B1516 66

The battery current polarity is positive for 2 minutes.

Action Taken When the DTC Sets

The regulated voltage control (RVC) is disabled.

Conditions for Clearing the DTC

The DTC passes when the battery current returns to the normal range for 15 seconds.

Diagnostic Aids

DTC B1516 08 could be set by overcharging with a battery charger or jump starting.

Reference Information

Schematic Reference

Starting and Charging Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Charging 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 Testing

B1516 08

1. Vehicle OFF, and all vehicle systems OFF, disconnect the harness connector at the B18 Battery Current Sensor. It may take up to 2 minutes for all vehicle systems to power down.

2. Test for less than 30 Ω between the low reference circuit terminal 2 and ground.

If 30 Ω or greater

1. Vehicle OFF, disconnect the X5 harness connector at the K9 Body Control Module.

2. Test for less than 2 Ω in the low reference 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 30 Ω

3. Vehicle in Service Mode.

4. Test for 4.8 - 5.2 V between the 5 V reference circuit terminal 1 and ground.

If less than 4.8 V

1. Vehicle OFF, disconnect the X4 harness connector at the K9 Body Control Module.

2. Test for infinite resistance between the 5 V reference 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 5 V reference 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 greater than 5.2 V

1. Vehicle OFF, disconnect the X4 harness connector at the K9 Body Control Module, Vehicle in Service Mode.

2. Test for less than 1 V between the 5 V reference 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 between 4.8 - 5.2 V

5. Test for 4.8 - 5.2 V between the signal circuit terminal 3 and ground.

If less than 4.8 V

1. Vehicle OFF, disconnect the X4 harness connector at the K9 Body Control Module.

2. Test for infinite resistance between the signal 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 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 greater than 5.2 V

1. Vehicle OFF, disconnect the X4 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, replace the K9 Body Control Module.

If between 4.8 - 5.2 V

6. Test or replace the B18 Battery Current Sensor.

B1516 66

1. Verify that the B18 Battery Current Sensor is installed securely around the negative battery cable, with the tape tab pointing away from the negative terminal on the C1 Battery.

If the B18 Battery Current sensor is not installed correctly

Remove and reinstall the B18 Battery Current Sensor properly.

If the B18 Battery Current Sensor is installed correctly

2. Replace the B18 Battery Current Sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for BCM replacement, setup, and programming

DTC B151A: LOW BATTERY CAPACITY DETECTED

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 B151A 58

Low Battery Capacity Detected

Circuit/System Description

The body control module (BCM) monitors the battery voltage level during an engine crank event to detect a low battery voltage condition.

Conditions for Running the DTC

The vehicle is ON

Conditions for Setting the DTC

A minimum crank battery voltage is less than the minimum crank battery voltage threshold for 16 consecutive crank events.

Action Taken When the DTC Sets

A driver information center message is displayed.

Conditions for Clearing the DTC

The DTC will clear if the minimum crank voltage is greater than the minimum crank voltage threshold during a crank event.

Reference Information

Schematic Reference

Starting and Charging Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Charging 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

Refer to the Battery Inspection/Test. Refer to the Charging System Test.

DTC B1527: PARASITIC LOAD

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 B1527 00

Parasitic Load

Circuit/System Description

The body control module (BCM) monitors the state of charge of the electrical system.

Conditions for Running the DTC

The ignition is in Accessory or Run mode.

Conditions for Setting the DTC

The state of charge at ignition ON is 30% lower than when the engine was running and battery drain is more than 2 A.

Action Taken When the DTC Sets

There is no battery telltale illuminated or DIC message displayed.

Conditions for Clearing the DTC

The DTC will clear if the fault does not return after 50 consecutive ignition cycles. The DTC will clear when run state of charge is greater than or equal to 80%.

Reference Information

Schematic Reference

Starting and Charging Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Charging 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

Refer to Battery Electrical Drain/Parasitic Load Test.

DTC P0A8D: 14V POWER MODULE SYSTEM VOLTAGE 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 P0A8D

14V Power Module System Voltage Low Voltage

Circuit/System Description

The 14V power module, often referred to as the accessory DC power control module, converts the high voltage (360V) direct current (DC) to low voltage (14V) DC to charge the 12V battery and to operate the power accessories. The ECM controls the 14V power module by supplying a 5V pulse width modulated (PWM) signal through a control circuit. The ECM monitors 12V battery voltage to ensure the 14V power module is maintaining the desired voltage.

Conditions for Running the DTC

14V power module is commanded ON.

Conditions for Setting the DTC

The ECM monitored battery voltage is less than or equal to 11V for 8 s within a 10 s window.

Action Taken When the DTC Sets

The charge indicator is illuminated.

The 14V power module stops supplying power to the 12V system. DTC P0A8D is a Type C DTC.

Conditions for Clearing the DTC DTC P0A8D is a Type C DTC. Diagnostic Aids

An improperly fastened 200-amp in-line mega-fuse may cause this DTC to set.

Reference Information

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Circuit/System Testing

1. Verify DTC P1F59, P1F5A, P1F5B, P1F5D, or P1F5E is not set.

If the DTC is set

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

If the DTC is not set

2. Perform the DC Power Conversion Test .

DTC P1F5D OR P1F5E: 14 VOLT POWER MODULE L-TERMINAL 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 P1F5D

14 Volt Power Module L-Terminal Circuit Low Voltage

DTC P1F5E

14 Volt Power Module L-Terminal Circuit High Voltage

Diagnostic Fault Information

Circuit/System Description

The ECM uses two circuits to control and monitor the state of the 14V power module, often referred to as the accessory DC power control module. The control circuit functions much like the L Terminal circuit on a generator equipped vehicle. A high side driver in the ECM applies a duty cycled voltage to the 14V power module. The duty cycle controls the 14V power module output. The ECM monitors the state of the 14V power module control circuit. The ECM will detect faults on the 14V power module control circuit when the vehicle is ON.

Conditions for Running the DTC

The vehicle is ON.

Conditions for Setting the DTC

P1F5D: The ECM detects a low voltage on the 14V power module control circuit for 8 seconds out of a 10 second window.

P1F5E: The ECM detects a high voltage on the 14V power module control circuit for 8 seconds out of a 10 second window.

Action Taken When the DTC Sets

DTCs P1F5D and P1F5E are type C DTCs.

Conditions for Clearing the DTC

DTCs P1F5D and P1F5E are type C DTCs.

Reference Information

Schematic Reference

Starting and Charging Schematics Hybrid/EV Controls Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

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 for Powertrain Diagnostic Trouble Code (DTC) Type Defenitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

NOTE: Do not have a 12V battery charger connected during the testing.

1. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

2. Verify the DTC does not set.

If the DTC sets

Refer to Circuit/System Testing.

If the DTC does not set

3. All OK.

Circuit/System Testing

1. Vehicle OFF, disconnect the X1 harness connector at the K1 14V Power Module, Vehicle On

2. Test for 3.0 - 5.5 V between the signal circuit terminal 1 X1 and ground.

If less than 3.0 V

1. Vehicle OFF, disconnect the harness connector at the K20 Engine Control Module.

2. Test for infinite resistance between the signal 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 signal circuit end to end.

If greater the 2 Ω, repair the open/high resistance in the circuit. If less than 2 Ω, replace the K20 Engine Control Module.

If greater than 5.5 V

1. Vehicle OFF, disconnect the harness connector at the K20 Engine Control Module, Vehicle in Service Mode.

2. Test for less than 1 V between the signal circuit 1 X1 and ground. If greater than 1 V, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module.

If between 3.0 - 5.5 V

3. Test or replace the K1 14V Power Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

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

DTC P1F59, P1F5A, OR P1F5B: 14 VOLT POWER MODULE STATUS TERMINAL 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 P1F59

14 Volt Power Module Status Terminal Circuit Performance

DTC P1F5A

14 Volt Power Module Status Terminal Circuit Low Voltage

DTC P1F5B

14 Volt Power Module Status Terminal Circuit High Voltage

Diagnostic Fault Information

Circuit/System Description

The ECM uses two circuits to control and monitor the state of the 14V power module, often referred to as the accessory DC power control module.

The status circuit functions much like the F Terminal circuit on a generator equipped vehicle. A high side driver in the 14V power module applies a duty cycled voltage to the ECM. The duty cycle indicates 14V power module internal temperature and operational condition. The ECM will detect faults on the 14V power module status circuit when the vehicle is ON.

Conditions for Running the DTC

The vehicle is ON.

Conditions for Setting the DTC

P1F5A: The ECM detects a 5% or lower PWM signal on the 14V power module status circuit for 8 seconds out of a 10 second window.

P1F5B: The ECM detects a 96% or higher PWM signal on the 14V power module status circuit for 8 seconds out of a 10 second window.

P1F59: The status circuit PWM signal is not in a valid range.

Action Taken When the DTC Sets

DTCs P1F59, P1F5A and P1F5B are type C DTCs.

Conditions for Clearing the DTC

DTCs P1F59, P1F5A and P1F5B are type C DTCs.

Reference Information

Schematic Reference

Starting and Charging Schematics Hybrid/EV Controls Schematics

Hybrid/EV Energy Storage Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

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. Vehicle OFF. Connect the vehicle to an AC supply to begin charging

2. Vehicle in Service Mode

3. Verify that DTC P0D26 is not set and that the vehicle will charge

If the DTC is set or the vehicle will not charge

Refer to DTC P0D26

If the DTC is not set

NOTE: Do not have a 12V battery charger connected during the testing.

4.

5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

6. Verify the DTC does not set.

If the DTC sets

Refer to Circuit/System Testing, specific to the DTC(s) set

If the DTC does not set

7. All OK.

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 will perform the following tasks: 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.

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

1.

DTC P1F5A or P1F5B, without P1F59 Diagnosis

1. Vehicle OFF, disconnect the X3 harness connector at the K20 Engine Control Module, Vehicle On

2. Test for 4.6 V - 7.0 V between the signal circuit terminal 19 X3 and ground.

If less than 4.6 V

1. Vehicle OFF, disconnect the harness connector at the K1 14V Power Module.

2. Test for infinite resistance between the signal 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 signal circuit end to end.

If greater the 2 Ω, repair the open/high resistance in the circuit. If less than 2 Ω, replace the K1 14V Power Module.

If greater than 7.0 V

1. Vehicle OFF, disconnect the harness connector at the K1 14V Power Module, Vehicle in Service Mode.

2. Test for less than 1 V between the signal circuit 19 X3 and ground. If greater than 1 V, repair the short to voltage on the circuit. If less than 1 V, replace the K1 14V Power Module..

If between 4.6 V - 7.0 V

3. Test or replace the K20 Engine Control Module.

DTC P1F59 Diagnosis

NOTE: You must perform Circuit/System Verification first

1. Disable the high voltage system for servicing the T18 Battery Charger, K1 14V Power Module and the A4 Hybrid/EV Battery Pack. Refer to High Voltage Disabling

2. Disconnect the X3 connector at the T18 Battery Charger, the X4 connector at the K1 14V Power Module and the X6 connector at the A28 Hybrid/EV Battery Contactor Assembly

3. Verify that all HV harness connector and the mating module connector terminals are free from moisture, corrosion, and arc flash damage.

If any terminals show signs of damage

Replace the HV wiring harness and affected modules as necessary

If no arc flash damage, moisture, or corrosion is found

4. Test the following HV harness terminals for less than 2 Ω end to end: X6-1 to X4-B

X6-1 to X3-1 X6-2 to X4-A X6-2 to X3-2

If greater than 2 Ω

Replace the HV wiring harness

If less than 2 Ω

Replace the K1 14V Power Module

5. Enable high voltage. Refer to High Voltage Enabling

6. Verify the DTC does not set

If the DTC sets

Replace the K20 Engine Control Module

If the DTC does not set

7. All OK

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Battery 300-Volt Positive and Negative Cable Replacement - High Voltage Battery to Charger Receptacle, Accessory DC Power Control Module, and Drive Motor Battery Charger

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

DTC U3001, U3003, U3006-U3009, U3013, U3014, U3018, U3019, OR U3500-U350B: BATTERY VOLTAGE/CONTROL MODULE

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 U3001

Control Module Improper Shutdown

DTC U3003

Battery Voltage

DTC U3006

Control Module Input Power 1

DTC U3007

Control Module Supply Circuit 2

DTC U3008

Control Module Ground 1

DTC U3009

Control Module Ground 2

DTC U3013

Control Module Input Power 3

DTC U3014

Control Module Input Power 4

DTC U3018

Control Module Supply Circuit 1-2 Not Plausible

DTC U3019

Control Module Supply Circuit 3-4 Not Plausible

DTC U3500

Control Module Input Power "A" Circuit Range/Performance

DTC U3501

Control Module Supply Circuit 1 Low Voltage

DTC U3502

Control Module Supply Circuit 1 High Voltage

DTC U3503

Control Module Input Power "A" Circuit Intermittent/Erratic

DTC U3504

Control Module Input Power "B" Circuit Range/Performance

DTC U3505

Control Module Supply Circuit 2 Low Voltage

DTC U3506

Control Module Supply Circuit 2 High Voltage

DTC U3507

Control Module Input Power "B" Circuit Intermittent/Erratic

DTC U3508

Control Module Input Power "C" Circuit Range/Performance

DTC U3509

Control Module Supply Circuit 3 Low Voltage

DTC U350A

Control Module Supply Circuit High Voltage

DTC U350B

Control Module Input Power "C" Circuit Intermittent/Erratic

Circuit/System Description

The vehicle control module monitors the system voltage to verify the system voltage is within the normal operating range.

Conditions for Running the DTC

The vehicle is ON.

Conditions for Setting the DTC

The control module or sensor detects a system voltage of less than approximately 7.5 V or greater than 16 V for approximately 5 seconds.

Action Taken When the DTC Sets

A driver information center message and/or warning indicator may be displayed. The control module may be temporarily disabled.

Conditions for Clearing the DTC

The system voltage returns to normal operating range.

Diagnostic Aids

A high or low voltage DTC set or voltage value in multiple modules/sensors indicates a concern in the 12 V charging system.

A possible cause of this DTC could be overcharging with a 12 V battery charger or jump starting.

Reference Information

Schematic Reference

Power Distribution Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Charging 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. Vehicle OFF, disconnect the drive motor battery charger cable from the X98 Hybrid/EV Battery Charger Receptacle. Measure and record the 12 V battery voltage at the battery terminals. The battery voltage should stabilize between 12.4 and 12.8 V within a few minutes of turning the Vehicle OFF.

If battery voltage is not between 12.4 and 12.8 V

Refer to Battery Inspection/Test.

If battery voltage is between 12.4 and 12.8 V

2. Vehicle ON, accessories OFF, measure and record the battery voltage at the battery terminals.

3. Verify the voltage is at least 1 V greater than the minimum voltage measured in step 1, but less than 15 V.

If the voltage is not at least 1 V greater than the minimum voltage measured in step 1 or is greater than 15 V.

Refer to DC Power Conversion Test .

If the voltage is at least 1 V greater than the minimum voltage measured in step 1, but less than 15 V.

4. Verify the appropriate control module scan tool battery voltage and ignition voltage parameters are within 1 V of the battery voltage.

If not within 1 V of the battery voltage

Refer to Circuit/System Testing.

If within 1 V of the battery voltage

5. All OK.

Circuit/System Testing

NOTE: Use the schematic to identify the following:

Which control modules the vehicle is equipped with

The control modules ground, B+, and Ignition circuit terminal IDs and connectors

1. Vehicle OFF, and all vehicle systems off, disconnect the scantool and harness connectors at the appropriate control module. It may take up to 2 min for all vehicle systems to power down.

2. Test for less than 10 Ω between each ground circuit terminal 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. Verify a test lamp illuminates between each B+ circuit terminal 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 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.

2. Test for infinite resistance between the B+ circuit and ground.

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

If the test lamp illuminates

4. Vehicle ON.

5. If equipped, verify a test lamp illuminates between each ignition circuit terminal 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.

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 appropriate control module.

If the test lamp illuminates

6. Replace the appropriate control module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

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

SYMPTOMS - ENGINE ELECTRICAL

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

Perform Diagnostic System Check - Vehicle before using the Symptom Tables in order to verify that all of the following are true:

The power modes are correct.

The control modules can communicate via the serial data link. There are no DTCs set.

Review the system descriptions and operations in order to familiarize yourself with the system functions. Refer to one of the following system operations:

Battery Description and Operation

Charging System Description and Operation

Starting System Description and Operation

Visual/Physical Inspection

Inspect for aftermarket devices which could affect the operation of the 12 V charging system. 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:

Battery Inspection/Test Battery Charging

Battery Electrical Drain/Parasitic Load Test Charging System Test

BATTERY INSPECTION/TEST

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 Aids

NOTE: For Warranty repairs -

You must use regionally required battery test equipment for warranty repairs.

For accurate test results the battery must be disconnected from the vehicle and the equipment connected directly to the battery posts. When setting up the equipment, select "Out of Vehicle" and then the correct battery type (Flooded, AGM or Stop/Start AGM) and rated CCA (both from the battery label) must be entered.

Failure to obtain the correct connections during the test may result in a failed test on a good battery.

Use the Out of Vehicle test (battery disconnected with test equipment connected directly to the posts) for each battery when testing a vehicle with dual batteries.

Reference Information

Schematic Reference

Starting and Charging Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Starting 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 Special Tools

EL 50313 Battery Tester For equivalent regional tools, refer to Special Tools

Circuit/System Testing

WARNING: Unless directed otherwise, the ignition must be OFF with the key removed, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

For Vehicles equipped with OnStar® (UE1) with Back Up Battery:

The Back Up Battery is a redundant power supply to allow limited OnStar® functionality in the event of a main vehicle battery power disruption to the VCIM (OnStar®module). Do not disconnect the main vehicle battery or remove the OnStar® fuse with the ignition key in any position other than OFF. Retained accessory power should be allowed to time out or be disabled (simply opening the driver door should disable retained accessory power) before disconnecting power. Disconnecting power to the OnStar® module in any way while the ignition is On or with retained accessory power activated may cause activation of the OnStar® Back-Up Battery system and will discharge and permanently damage the back-up battery. Once the Back-Up Battery is activated it will stay on until it has completely discharged. The back-up battery is not rechargeable and once activated the back-up battery must be replaced.

1. Verify the C1 Battery or C1B Battery - Auxiliary (if equipped) case is not cracked, broken, or damaged, which may be indicated by battery acid leakage.

If there is any apparent damage

Replace the C1 Battery or C1B Battery - Auxiliary.

If there is no damage

2. Verify that the battery cables are clean and tight. The battery terminal bolts should be torqued as specified in

Fastener Specifications.

If the battery cables need to be cleaned or tightened

Clean as required and tighten as specified.

If the battery cables are clean and tight

3. Disconnect battery from the vehicle. There is no need to remove the battery from the vehicle.

4. Connect the EL-50313 directly to the battery terminal posts.

5. Select "Charging," "Diagnostic" and "Out of Vehicle" when setting up the test.

6. Select the proper battery type, Flooded, AGM or Stop/Start AGM.

7. Enter the CCA as shown on the battery label.

8. Verify the test result is not REPLACE BATTERY or BAD CELL-REPLACE

NOTE: Always write the test code displayed by the tester on the repair order for any warranty purposes. The number is a unique code that describes the test data for a particular battery at a particular time. The test code may occasionally repeat when you retest the same battery. More often, each test will result in a different code. Use the test code from the Out of Vehicle test.

If the test result is REPLACE BATTERY or BAD CELL-REPLACE

Replace the C1 Battery or C1B Battery - Auxiliary.

If the test result is not REPLACE BATTERY or BAD CELL-REPLACE

9. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Battery Replacement BATTERY CHARGING

12 V Battery

The following procedure is for the 12 V battery only.

Special Tools

EL 50313 Midtronics GR8 Battery Tester Charger For equivalent regional tools, refer to Special Tools. Diagnostic Aids

NOTE: This vehicle is equipped with an Absorbent Glass Matt Battery. This type of battery

requires different charging and testing parameters than the more common regular flooded lead acid type battery. ANY time you perform charging and or testing you MUST set up the charging/testing equipment or permanent damage to the battery may result.

The charging area should be well ventilated.

Do not charge a battery that appears to be frozen. Allow the battery to warm to room temperature and test it using the EL 50313 before charging.

An AGM battery may be damaged if charged to more than 14.5 V.

A Flooded Cell battery may be damaged if charged to more than 16.5 V.

Vehicles with dual batteries must be charged individually which will result in two printouts.

Battery State of Charge

NOTE: Using voltage to determine the battery's state of charge is only accurate after the battery has been at rest for 24 hours. This is enough time for the acid in each cell to equalize. If the battery has been charged or discharged in the past 24 hours, the battery state of charge will only be an estimate.

The maintenance-free batteries state of charge is estimated by reading the voltage of the battery across the battery terminals. Because the voltage is affected by current flow into or out of the battery, the engine must be stopped and all electrical loads turned OFF, including parasitic loads, when checking the voltage. The voltage can also be affected if the battery has just been charged or discharged, so it is important to consider what has happened to the battery in the time just before testing. Use the following procedure to determine the battery's state of charge:

1. Be sure all electrical loads are turned OFF.

2. Determine whether the battery has been used in a vehicle or charged within the past 12 hours.

If the answer is no, the terminal voltage will be stabilized and no action is necessary before reading the voltage. Skip to step 3.

If the answer is yes, terminal voltage will not be stabilized and you should wait 12 hours since the last time the battery was used.

3. Estimate the battery temperature by determining the average temperature to which the battery has been exposed for the past 12 hours.

NOTE: The table is accurate to 10 percent only after the battery has been at rest for 12 hours.

4. Measure the battery voltage at the battery terminals. Refer to the following table to determine the state of charge according to the estimated battery temperature:

Use the state of charge information as follows:

A battery with a state of charge that is below 65 percent must always be recharged before returning it to service or continuing storage.

A battery with a state of charge that is 65 percent or greater is generally considered to be charged enough in order to be returned to normal service or in order to continue storage. However, if the battery is being used in slow traffic or with short drive times, or if the temperature is very hot or very cold, the battery should be fully charged, to at least 90 percent, before returning it to service or continuing storage.

Charging Time Required

The time required to charge a battery will vary depending upon the following factors:

The battery charger capacity - The higher the charger amperage, the less time it will take to charge the battery.

The state of charge of the battery - A completely discharged battery requires more than twice as much charging time as a half charged battery. In a discharged battery with a voltage below 11 V, the battery has a very high internal resistance and may only accept a very low current at first. Later, as the charging current causes the acid content to increase in the electrolyte, the charging current will increase. Extremely discharged batteries may not activate the reversed voltage protection in some chargers. Refer to the manufacturer's instructions for operating this circuitry.

The temperature of the battery - The colder the battery is, the more time it takes to recharge the battery. The charging current accepted by a cold battery is very low at first. As the battery warms, the charging current will increase.

Charging Procedure

CAUTION: Turn OFF the ignition when connecting or disconnecting the battery cables, the battery charger or the jumper cables. Failure to do so may damage the ECM/PCM or other electronic components.

CAUTION: Refer to Fastener Caution .

When charging side-terminal batteries with the battery cables connected, connect the charger to the positive cable bolt and to a ground located away from the battery. When charging side-terminal batteries with the battery cables disconnected, install the battery side terminal adapters and connect the charger to the adapters.

Use the following procedure to charge the battery:

1. Ensure that all of the battery terminal connections are clean and tight.

2. Connect the charger positive lead to the battery positive terminal on the battery or the remote jumper stud underhood.

CAUTION: Do not connect the negative charger lead to the housings of other vehicle electrical accessories or equipment. The action of the battery charger may damage such equipment.

3. Connect the negative charger lead to a solid engine ground or to a ground stud in the engine compartment that is connected directly to the battery negative terminal, but away from the battery. If the negative battery cable is disconnected and a terminal adapter is being used, connect directly to the adapter.

4. Select "Charging," "PDI" and "In Vehicle" when setting up the charger.

5. Select the proper battery type, Flooded, AGM, Spiral AGM or Stop/Start AGM.

6. Enter the CCA as shown on the battery label.

BATTERY ELECTRICAL DRAIN/PARASITIC LOAD TEST

12 V Battery

The following procedure is for the 12 V battery only.

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

Components most likely to cause a parasitic draw on the vehicle's battery are switches, relays, and control modules. After the vehicle is turned OFF the control modules will begin to go to sleep (shut OFF). All control modules do not go to sleep at the same time, some may take up to 30 minutes or longer after turning the Vehicle OFF before going to sleep, like the HVAC and body control modules. Others such as the telematics communication interface control module and remote control door lock receiver may periodically wake up then go back to sleep. These are all normal conditions.

Diagnostic Aids

Rule out any possible aftermarket equipment causing an unacceptable parasitic current drain. Aftermarket accessories installed into the courtesy lamp circuit can cause the inadvertent power timer in the body control module (BCM) to keep resetting. This would cause the BCM to remain awake and cause a current drain on the battery.

Rule out customer driving habits such as regular short trips that do not allow enough time to properly charge the battery. Refer to Battery Description and Operation .

Verify that the battery and charging system are in proper working order. Refer to Battery Charging , and

Charging System Test.

A battery discharging for no apparent reason while the vehicle is parked can be caused by an intermittent draw, such as a module waking up, or a continuous draw, such as a dome light or stuck relay.

Some systems and modules such as OnStar®, and regulated voltage control, if equipped, are designed to wake-up, perform a task, and go back asleep at regular intervals. Refer to Body Control System Description and Operation for the system or modules description and operation.

An engine off natural vacuum evaporative test can occur if the engine control module (ECM) determines the drive cycle has met the appropriate criteria immediately after key off. The ECM will stay awake and the vent solenoid will stay energized for as long as 45 minutes. The typical current draw for this is about 1 A.

The telematics communication interface control module current draw is very low, less than 40 mA, so the OnStar system is left in that "awake" state for up to the first 48 hours. Parasitic draw of up to 40 mA with an occasional spike as high as 80 mA through the telematics communication interface control module for the first 48 hours is normal.

Some automatic climate control systems can remain in a semi-awake state for up to three hours, actual draw amounts vary by vehicle platform but are typically not greater than 50 mA.

An extremely low mA current level is consumed by the RKE receiver for monitoring purposes, actual system wake up only occurs when the fobs for the vehicle are used. When other devices on the same RKE operating

frequency are activated, such as the 4 tire pressure monitoring sensors and other vehicle transmitters in the vicinity, the RKE receiver will have a 100 mA spike. These spikes are normal and occur too briefly to have a significant effect on battery drain. Competing signals may cause RKE performance issues such as jamming but should not cause excessive battery draw.

If an excessive current draw is not present during initial testing, continue periodic testing over a 1-2 hour period to see if the current draw increases and stays above an unacceptable level.

NOTE: The battery specification listed below is a generic specification. Refer to the label on the original battery when testing the battery.

The battery run down time will vary depending on the batteries reserve capacity. If the reserve capacity is higher, then the battery run down time would be longer. If the reserve capacity is lower, then the battery run down time would be shorter. The graph below indicates roughly how many days a 690 cold cranking amp battery with a 110 minute reserve capacity starting at 80 percent state of charge will last with a constant current draw until it reaches 50 percent state of charge. Differences in battery reserve capacity and temperature will affect the results.

Reference Information

Schematic Reference

Control Module References

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Electrical Information Reference

Circuit Testing

Testing for Intermittent Conditions and Poor Connections Connector Repairs

Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information Special Tools

EL 38758 Parasitic Draw Test Switch

For equivalent regional tools, refer to Special Tools.

Circuit/System Verification

NOTE: Most vehicle systems will go to sleep within 30 minutes but it can take up to 2 hours before all systems power down allowing the parasitic draw test to pass. An occasional increase in the parasitic draw is normal as long as it returns within 1 second.

Closing the door latches/ajar switch while leaving the doors open is recommended, this allows the vehicle systems to perform in a "doors closed" mode while allowing vehicle interior access that may be needed to complete the diagnostic steps.

Locking doors will arm the vehicle content theft deterrent system if equipped. Failure to arm the system may cause a theft system fault to not be present during testing.

There are many things that can prevent the vehicle from completely going to sleep and passing the parasitic draw test. Make sure all the conditions listed below are met before performing the parasitic current draw test.

Vehicle OFF

Retained Accessory Power RAP OFF - open and close the driver door after Vehicle OFF

Scan tool not communicating with a vehicle control module - in some cases it may need to be disconnected from the data link connector.

All access doors closed

Headlamps OFF - auto headlamps disabled Any delay lighting OFF

If equipped with an under hood lamp disable it HVAC after blow OFF

Any accessory that can work with Vehicle OFF inactive or OFF

Wait up to 2 minutes or longer, after all other listed conditions are met

Using an Inductive Pickup Probe

1. Connect an inductive pickup probe to the negative battery cable that can read down to 1 mA.

2. Vehicle OFF, as the vehicle systems shut down test for less than 30 mA of parasitic current drain. If greater than the specified range, refer to Circuit/System Testing.

Using the EL 38758 Parasitic Draw Test Switch

WARNING: Refer to Battery Disconnect Warning .

CAUTION: When a fused jumper wire or digital multimeter is connected to the test switch terminals, always turn the test switch ON before opening any access door, turning the ignition on, or turning any accessory on. This is to prevent damaging the jumper wire or digital multimeter fuse.

NOTE: The switch knob on the EL 38758 switch is marked ON and OFF. When the switch knob is in the ON position, the circuit is closed and electrical current will pass through the switch. When the switch knob is in the OFF position, the circuit is open and electrical current will not pass through the switch.

1. Vehicle OFF, disconnect the battery negative cable from the battery. Refer to Battery Negative Cable Disconnection and Connection.

2. Turn the EL 38758 switch knob to the OFF position.

3. Install the male end of the EL 38758 switch to the battery ground terminal.

4. Install the battery negative cable to the female end of the EL 38758 switch.

5. Turn the EL 38758 switch knob to the ON position.

6. Road test the vehicle and activate all of the accessories such as the radio and air conditioning.

7. Vehicle OFF, connect a 10 A fused jumper wire to the test switch tool terminals.

8. Turn the EL 38758 switch knob to the OFF position. The current now flows through the jumper wire.

9. Check the fuse in the jumper wire. The fuse should be OK.

Failed: If the jumper wire fuse is blown, refer to Circuit/System Testing. Passed

10. Turn the EL 38758 switch knob to the ON position. Remove the fused jumper wire.

11. Connect a digital multimeter set to the 10 A DC scale between the test switch tool terminals.

12. Turn the EL 38758 switch knob to the OFF position. The current now flows through the DMM.

13. As the vehicle systems shut down test for less than 30 mA of parasitic current drain. If greater than the specified range, refer to Circuit/System Testing.

Circuit/System Testing

NOTE: Removing or installing a fuse, relay, or connector, to determine the area causing high parasitic draw may wake up control modules. You must wait for the control modules to go back to sleep before retesting. It is best to install any removed or disconnected components after the diagnosis is completed.

Fuses for power mode master components such as the BCM should be removed last to avoid misdiagnosis.

If a scan tool is connected to the DLC, either disconnect it or subtract the scan tool current draw from the DMM reading to get the actual vehicle parasitic current draw.

If the vehicle has an unacceptable amount of parasitic current draw, remove each fuse one at a time until the current draw falls to an acceptable level. A drop of more than 10-20 mA, when disabling a single system or circuit, is an indication of an overly high current draw that could be causing the battery drain. Refer to Power Distribution Schematics to diagnose exactly which circuit of the suspect system is causing the high parasitic drain. The follow is a list of common components that could cause a high current draw:

Stuck switch Stuck relay

Control module

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for control module replacement, programming and setup

CHARGING SYSTEM TEST

The accessory power module (APM) supplies the energy that flows between the high voltage (300 volt) direct current (DC) and low voltage (14 volt) DC to charge the 12 volt battery and power accessories. To test the charging system, refer to DC Power Conversion Test .

REPAIR INSTRUCTIONS

BATTERY NEGATIVE CABLE DISCONNECTION AND CONNECTION

Removal Procedure

1. Ensure that all lamps and accessories are turned off.

2. Turn the ignition OFF and remove the ignition key.

3. Disconnect and remove all 12V battery chargers and the AC charger cable from the hybrid battery charger receptacle.

Fig. 2: Rear Compartment Floor Panel Trim Courtesy of GENERAL MOTORS COMPANY

4. Remove Rear Compartment Floor Panel Trim (1)Rear Compartment Floor Panel Trim Replacement

Fig. 3: Battery Negative Post Clamp And Nut Courtesy of GENERAL MOTORS COMPANY

WARNING: Battery Disconnect Warning

5. Loosen the battery negative post clamp nut (1).

6. Disconnect the battery negative post clamp (2).

Installation Procedure

Fig. 4: Battery Negative Post Clamp And Nut Courtesy of GENERAL MOTORS COMPANY

NOTE: Clean any existing corrosion from the battery terminal and the battery cable end.

1. Connect the battery negative post clamp (2).

CAUTION: Fastener Caution

2. Tighten the battery negative post clamp nut (1) to 9 N.m (80 lb in)

Fig. 5: Rear Compartment Floor Panel Trim Courtesy of GENERAL MOTORS COMPANY

3. Install Rear Compartment Floor Panel Trim (1)Rear Compartment Floor Panel Trim Replacement

BATTERY POSITIVE AND NEGATIVE CABLE REPLACEMENT (12 V BATTERY TO ACCESSORY DC POWER CONTROL MODULE)

Removal Procedure

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 will perform the following tasks: 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.

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

1. Disable the high voltage system. High Voltage Disabling

2. Remove Rear Compartment Floor Stowage Trim Compartment Rear Compartment Floor Stowage Trim Compartment Replacement

3. Disconnect Battery Negative Cable Battery Negative Cable Disconnection and Connection

Fig. 6: Panel Trim And Nuts

Courtesy of GENERAL MOTORS COMPANY

4. Remove the 3 panel trim nuts (1).

5. Remove the panel trim (2).

Fig. 7: Battery Fuse Block Cover And Retaining Tabs Courtesy of GENERAL MOTORS COMPANY

6. Release the retaining tabs.(1)

7. Remove Battery Fuse Block Cover(2)

Fig. 8: Battery Positive Cable And Nut Courtesy of GENERAL MOTORS COMPANY

8. Remove Battery Positive Cable Nut (4) @Battery Distribution Fuse Block (5)

9. Remove Battery Positive Cable Nut (1) @Accessory DC Power Control Module (2)

10. Disengage Retainer (3)

Fig. 9: Battery Negative Cable Ground Fastener Courtesy of GENERAL MOTORS COMPANY

11. Remove Battery Negative Cable Ground Fastener (1) @Battery Tray (3)

12. Remove Battery Positive and Negative Cable (2)

Installation Procedure

Fig. 10: Battery Negative Cable Ground Fastener Courtesy of GENERAL MOTORS COMPANY

1. Install Battery Positive and Negative Cable (2)

CAUTION: Fastener Caution

2. Install Battery Negative Cable Ground Fastener (1) @Battery Tray (3) and tighten 22 N.m (16 lb ft)

Fig. 11: Battery Positive Cable And Nut Courtesy of GENERAL MOTORS COMPANY

3. Install Battery Positive Cable Nut (4) @Battery Distribution Fuse Block (5) and tighten 15 N.m (133 lb in)

4. Install Battery Positive Cable Nut (1) @Accessory DC Power Control Module and tighten 22 N.m (16 lb ft)

5. Engage Retainer (3)

Fig. 12: Battery Fuse Block Cover And Retaining Tabs Courtesy of GENERAL MOTORS COMPANY

6. Install Battery Fuse Block Cover (2)

7. Check the 2 locked retaining tabs (1).

Fig. 13: Panel Trim And Nuts

Courtesy of GENERAL MOTORS COMPANY

8. Install the panel trim (2).

9. Install the 3 panel trim nuts (1) and tighten to 6 N.m (53 lb in).

10. Connect Battery Negative Cable Battery Negative Cable Disconnection and Connection

11. Install Rear Compartment Floor Stowage Trim Compartment Rear Compartment Floor Stowage Trim Compartment Replacement

12. Enable the high voltage system. High Voltage Enabling

BATTERY NEGATIVE CABLE REPLACEMENT

Removal Procedure

1. Record all of the radio station presets.

2. Ensure that all lamps and accessories are turned off.

3. Turn the ignition OFF and remove the ignition key.

4. Remove Rear Compartment Floor Panel Trim Replacement

Fig. 14: Battery Negative Pole Clamp Nut And Electrical Connector Courtesy of GENERAL MOTORS COMPANY

WARNING: Battery Disconnect Warning

5. Loosen the battery negative pole clamp nut (4).

6. Disconnect the battery negative pole clamp.

7. Disconnect Electrical Connector (3)

8. Remove the battery negative ground cable bolt (1).

9. Remove Battery Negative Cable (2)

Installation Procedure

Fig. 15: Battery Negative Pole Clamp Nut And Electrical Connector Courtesy of GENERAL MOTORS COMPANY

NOTE: Clean any existing corrosion from the battery terminal and the battery cable end.

1. Install Battery Negative Cable (2)

CAUTION: Fastener Caution

2. Install the battery negative ground cable bolt (1) and tighten to 22 N.m (16 lb ft).

3. Connect Electrical Connector (3)

4. Connect the battery negative pole clamp.

5. Tighten the battery negative pole clamp nut (4) to 9 N.m (80 lb in).

6. Install Rear Compartment Floor Panel Trim Replacement

7. Insert the ignition key and turn the ignition to the ON position.

8. Program all of the customer's radio station presets and set the radio clock to the current time.

BATTERY POSITIVE CABLE REPLACEMENT

Removal Procedure

1. Remove Rear Compartment Floor Stowage Trim Compartment Replacement

2. Disconnect Battery Negative Cable Disconnection and Connection

Fig. 16: Panel Trim And Nuts

Courtesy of GENERAL MOTORS COMPANY

3. Remove the 3 panel trim nuts (1).

4. Remove the panel trim (2).

Fig. 17: Battery Fuse Block Cover And Retaining Tabs Courtesy of GENERAL MOTORS COMPANY

5. Release the retaining tabs.(1)

6. Remove Battery Fuse Block Cover (2)

Fig. 18: Battery Positive Cable Fuse Block Nut Courtesy of GENERAL MOTORS COMPANY

7. Remove the battery positive cable fuse block nut (2).

8. Unclip Retainer(1)

9. Remove Quarter Lower Rear Trim Panel Replacement (Left Side) Quarter Lower Rear Trim Panel Replacement (Right Side)

Fig. 19: Retainer

Courtesy of GENERAL MOTORS COMPANY

10. Unclip Retainer (1)

11. Unclip Center Pillar Lower Trim Panel Replacement

Fig. 20: Retainer

Courtesy of GENERAL MOTORS COMPANY

12. Unclip Retainer (1)

Fig. 21: Battery Positive Cable And Floor Carpet Courtesy of GENERAL MOTORS COMPANY

13. For a better access, fold the floor carpet (2) aside.

14. Remove the battery positive cable (1) from the left channel.

Fig. 22: Retainer

Courtesy of GENERAL MOTORS COMPANY

15. For a better access, fold the floor carpet aside.

16. Unclip Retainer (1)

17. Remove Dash Upper Extension Panel Opening Cover Replacement

18. Remove Windshield Wiper System Module Replacement

19. Remove Engine Wiring Harness Junction Block Replacement

Fig. 23: Battery Positive Cable And Retaining Tabs Courtesy of GENERAL MOTORS COMPANY

20. Release the 2 retaining tabs to open the cover (1).

21. Pull the battery positive cable (2) through the harness grommet into the passenger compartment.

22. Separate the battery positive cable from the body harness.

23. Remove the battery positive cable from the vehicle.

Installation Procedure

1. Position the battery positive cable to the vehicle.

2. Insert the battery positive cable to the body harness.

3. Push the battery positive cable terminal through the grommet into the front engine compartment.

Fig. 24: Battery Positive Cable And Retaining Tabs Courtesy of GENERAL MOTORS COMPANY

4. Close the cover (1).

5. Install Engine Wiring Harness Junction Block Replacement

6. Install Windshield Wiper System Module Replacement

7. Install Dash Upper Extension Panel Opening Cover Replacement

Fig. 25: Retainer

Courtesy of GENERAL MOTORS COMPANY

8. For a better access, fold the floor carpet aside.

9. Install Retainer (1)

Fig. 26: Battery Positive Cable And Floor Carpet Courtesy of GENERAL MOTORS COMPANY

10. For a better access, fold the floor carpet (2) aside.

11. Install the battery positive cable (1) to the left channel.

Fig. 27: Retainer

Courtesy of GENERAL MOTORS COMPANY

12. Install Retainer (1)

13. Install Center Pillar Lower Trim Panel Replacement

Fig. 28: Retainer

Courtesy of GENERAL MOTORS COMPANY

14. Install Retainer (1)

15. Install Quarter Lower Rear Trim Panel Replacement (Left Side) Quarter Lower Rear Trim Panel Replacement (Right Side)

Fig. 29: Battery Positive Cable Fuse Block Nut Courtesy of GENERAL MOTORS COMPANY

16. Install Retainer (1)

CAUTION: Fastener Caution

17. Install the battery positive cable fuse block nut (2) and tighten to 9 N.m (80 lb in).

Fig. 30: Battery Fuse Block Cover And Retaining Tabs Courtesy of GENERAL MOTORS COMPANY

18. Install Battery Fuse Block Cover (2)

19. Lock the 2 retaining tabs (1).

Fig. 31: Panel Trim And Nuts

Courtesy of GENERAL MOTORS COMPANY

20. Install the panel trim (2).

21. Install the 3 panel trim nuts (1) and tighten to 6 N.m (53 lb in).

22. Connect Battery Negative Cable Disconnection and Connection

23. Rear Compartment Floor Stowage Trim Compartment Replacement

ENGINE WIRING HARNESS JUNCTION BLOCK REPLACEMENT

Removal Procedure

1. Disconnect Battery Negative Cable Disconnection and Connection

Fig. 32: Plastic Quick Connect Fitting Release Tabs And Cover Courtesy of GENERAL MOTORS COMPANY

2. Squeeze the 3 plastic quick connect fitting release tabs (1) to remove the cover (2).

Fig. 33: Fitting Release Tabs And Cover Courtesy of GENERAL MOTORS COMPANY

3. Release the 2 tabs (1).

4. Remove the cover (2).

Fig. 34: Engine Wiring Harness Junction Block Supply Nuts Courtesy of GENERAL MOTORS COMPANY

5. Remove the 2 engine wiring harness junction block supply nuts (1, 3).

6. Remove the 2 engine wiring harness junction block supply (2).

Fig. 35: Engine Wiring Harness Junction Block Bolts And Retaining Tabs Courtesy of GENERAL MOTORS COMPANY

NOTE: Bolts (3) are encapsulated on the end of threads so that they can not be removed from the fuse block.

7. Loosen the 3 engine wiring harness junction block bolts (3).

8. Unlock the 3 retaining tabs (1) and the retaining tabs (4) and remove the engine wiring harness junction block (2).

Installation Procedure

Fig. 36: Electrical Connectors

Courtesy of GENERAL MOTORS COMPANY

1. Push down the 3 electrical connectors (1) before installation of the engine wiring harness junction block.

Fig. 37: Engine Wiring Harness Junction Block Bolts And Retaining Tabs Courtesy of GENERAL MOTORS COMPANY

2. Install the engine wiring harness junction block (2):

1. Lock the 3 retaining tabs (1) and the retaining tabs (4).

CAUTION: Fastener Caution

2. Tighten the 3 engine wiring harness junction block bolts (3) to 7 N.m (62 lb in).

Fig. 38: Engine Wiring Harness Junction Block Supply Nuts Courtesy of GENERAL MOTORS COMPANY

3. Install the 2 engine wiring harness junction block supply (2).

4. Install the engine wiring harness junction block supply nut (1) and tighten to 15 N.m (11 lb ft).

5. Install the engine wiring harness junction block supply nut (3) and tighten to 5 N.m (44 lb in).

Fig. 39: Fitting Release Tabs And Cover Courtesy of GENERAL MOTORS COMPANY

6. Install the cover (2).

7. Check the locked tabs (1).

Fig. 40: Plastic Quick Connect Fitting Release Tabs And Cover Courtesy of GENERAL MOTORS COMPANY

8. Install the cover (2). Check the locked 3 plastic quick connect fitting tabs (1).

9. Connect Battery Negative Cable Disconnection and Connection

BATTERY REPLACEMENT

Removal Procedure

1. Remove Rear Compartment Floor Stowage Trim Compartment Replacement

2. Disconnect Battery Negative Cable Disconnection and Connection

Fig. 41: Panel Trim And Nuts

Courtesy of GENERAL MOTORS COMPANY

3. Remove the 3 panel trim nuts (1).

4. Remove the panel trim (2).

Fig. 42: Battery Fuse Block Cover And Retaining Tabs Courtesy of GENERAL MOTORS COMPANY

5. Remove Release the retaining tabs.(1)

6. Remove Battery Fuse Block Cover (2)

Fig. 43: Battery Positive Pole Clamp Nut Courtesy of GENERAL MOTORS COMPANY

7. Loosen the battery positive pole clamp nut (2).

8. Use a screwdriver (1) to unclip the 2 battery fuse block retainer tabs from the battery and remove the battery fuse block (3) along with the battery positive cables.

Fig. 44: Battery Hold Down Retainer Bolt Courtesy of GENERAL MOTORS COMPANY

9. Remove the battery hold down retainer bolt (3).

10. Remove the battery retainer strap (2).

11. Remove Battery Hold Down Retainer(1)

Fig. 45: View Of Battery

Courtesy of GENERAL MOTORS COMPANY

12. Remove the battery (1) from the rear compartment area along with their vent hose.

Installation Procedure

Fig. 46: View Of Battery

Courtesy of GENERAL MOTORS COMPANY

NOTE: Clean any existing corrosion from the battery terminal and the battery cable end.

1. Position the battery (1) onto the tray to the rear of the vehicle as shown in the graphic.

2. Install the vent hose through the body.

Fig. 47: Battery Hold Down Retainer Bolt Courtesy of GENERAL MOTORS COMPANY

3. Install Battery Hold Down Retainer (1)

4. Install the battery retainer strap (2).

CAUTION: Fastener Caution

5. Install the battery hold down retainer bolt (3) and tighten to 18 N.m (13 lb ft).

Fig. 48: Battery Fuse Block

Courtesy of GENERAL MOTORS COMPANY

6. Install the battery fuse block (2) along with the battery positive cables to the battery:

1. Align the rear side of the battery fuse block exactly to the battery housing.

2. Clip in the 2 battery fuse block retainer tabs (3).

3. Tighten the battery positive pole clamp nut (1) to 9 N.m (80 lb in).

Fig. 49: Battery Fuse Block Cover And Retaining Tabs Courtesy of GENERAL MOTORS COMPANY

7. Install Battery Fuse Block Cover (2)

8. Check the locked 2 retaining tabs (1).

Fig. 50: Panel Trim And Nuts

Courtesy of GENERAL MOTORS COMPANY

9. Install the panel trim (2).

10. Install the 3 panel trim nuts (1) and tighten to 6 N.m (53 lb in).

11. Connect Battery Negative Cable Disconnection and Connection

12. Install Rear Compartment Floor Stowage Trim Compartment Replacement

ENGINE GROUND STRAP REPLACEMENT

Removal Procedure

1. Disconnect Battery Negative Cable Disconnection and Connection

2. Raise and support the vehicle. Lifting and Jacking the Vehicle

Fig. 51: Engine Ground Strap Bolt And Retainer Courtesy of GENERAL MOTORS COMPANY

3. Remove the engine ground strap bolt (1).

4. Unclip Retainer(2)

Fig. 52: Retainer

Courtesy of GENERAL MOTORS COMPANY

5. Unclip Retainer(1)

6. Remove Front Wheelhouse Liner Replacement (Left Side) Front Wheelhouse Liner Replacement (Right Side)

Fig. 53: Engine Ground Strap Bolt

Courtesy of GENERAL MOTORS COMPANY

NOTE: The bolt is behind the body plate.

7. Remove the engine ground strap bolt (1).

Installation Procedure

Fig. 54: Engine Ground Strap Bolt

Courtesy of GENERAL MOTORS COMPANY

CAUTION: Fastener Caution

NOTE: The bolt is behind the body plate.

1. Install the engine ground strap bolt (1) and tighten to 25 N.m (18 lb ft).

2. Install Front Wheelhouse Liner Replacement (Left Side) Front Wheelhouse Liner Replacement (Right Side)

Fig. 55: Retainer

Courtesy of GENERAL MOTORS COMPANY

3. Install Retainer(1)

Fig. 56: Engine Ground Strap Bolt And Retainer Courtesy of GENERAL MOTORS COMPANY

4. Install the engine ground strap bolt (1) and tighten to 25 N.m (18 lb ft).

5. Install Retainer(2)

6. Lower the vehicle.

7. Connect Battery Negative Cable Disconnection and Connection

DESCRIPTION AND OPERATION

BATTERY DESCRIPTION AND OPERATION

300 V Battery

For information about the 355 V hybrid drive motor battery, refer to Drive Motor Battery System Description .

Absorbent Glass Mat Battery

This vehicle is equipped with an absorbent glass mat battery. This is similar to current vehicle lead acid flood batteries, except they use glass mats that absorb electrolytes that are pressed between the plates instead of immersing the plates in electrolytes. This allows a smaller, lighter battery with the same amount of power and is less susceptible to heat.

The maximum permissible voltage allowed for the absorbent glass mat battery is 14.8 V (at room temperature).

12 V Battery

WARNING: Batteries produce explosive gases, contain corrosive acid, and supply levels of electrical current high enough to cause burns. Therefore, to reduce the risk of personal injury when working near a battery:

Always shield your eyes and avoid leaning over the battery whenever possible. Do not expose the battery to open flames or sparks.

Do not allow the battery electrolyte to contact the eyes or the skin. Flush immediately and thoroughly any contacted areas with water and get medical help.

Follow each step of the jump starting procedure in order.

Treat both the booster and the discharged batteries carefully when using the jumper cables.

NOTE: Because of the materials used in the manufacture of automotive lead-acid batteries, dealers and service shops that handle them are subject to various regulations issued by OSHA, EPA, DOT, and various state or local agencies. Other regulations may also apply in other locations. Always know and follow these regulations when handling batteries.

Batteries that are no longer wanted must be disposed of by an approved battery recycler and must never be thrown in the trash or sent to a landfill.

Batteries that are not part of the vehicle itself, not the battery under the hood, must only be transported on public streets for business purposes via approved hazardous material transportation procedures.

Battery storage, charging and testing facilities in repair shops must meet various requirements for ventilation, safety equipment, material segregation, etc.

The maintenance free battery is standard. There are no vent plugs in the cover. The battery is completely sealed except for 2 small vent holes in the side. These vent holes allow the small amount of gas that is produced in the battery to escape.

Battery Ratings

A battery has 2 ratings:

Cold cranking amperage Amp hours

When a battery is replaced use a battery with similar ratings. Refer to the battery specification label on the original battery.

Amp Hours

The amp hour rating tells you how much amperage is available when discharged evenly over a 20 hour period. The amp hour rating is cumulative, so in order to know how many constant amps the battery will output for 20 hours, you have to divide the amp hour rating by 20. Example: If a battery has an amp hour rating of 74, dividing by 20 = 3.75. Such a battery can carry a 3.75 A load for 20 hours before dropping to 10.5 V. (10.5 V is the fully discharged level, at which point the battery needs to be recharged.) A battery with an amp hour rating of 55 will carry a 2.75 A load for 20 hours before dropping to 10.5 V.

Cold Cranking Amperage

The cold cranking amperage is an indication of the ability of the battery to crank the engine at cold temperatures. The cold cranking amperage rating is the minimum amperage the battery must maintain for 30 seconds at - 18°C (0°F) while maintaining at least 7.2 V. Refer to the battery specification label on the original battery for the cold cranking amperage rating for this vehicle.

CHARGING SYSTEM DESCRIPTION AND OPERATION

12 V Battery

The following information is for the 12 V battery only.

For information about charging the high voltage drive motor batteries, refer to Drive Motor Battery System Description .

Electrical Power Management Overview

The electrical power management system is designed to monitor and control the charging system and send diagnostic messages to alert the driver of possible problems. This electrical power management system primarily utilizes existing on-board computer capability to maximize the effectiveness of the charging system, manage the load, improve battery state of charge and life, and minimize the system's impact on fuel economy. The electrical power management system performs 3 functions:

It monitors the battery voltage and estimates the battery condition. It takes corrective actions by adjusting the regulated voltage.

It performs diagnostics and driver notification.

The battery condition is estimated during Vehicle OFF and during Vehicle in Service Mode. During Vehicle OFF the state of charge of the battery is determined by measuring the open-circuit voltage. The state of charge is a function of the acid concentration and the internal resistance of the battery, and is estimated by reading the battery open circuit voltage when the battery has been at rest for several hours.

The state of charge can be used as a diagnostic tool to tell the customer or the dealer the condition of the battery. During Vehicle ON mode, the algorithm continuously estimates state of charge based on adjusted net amp hours, battery capacity, initial state of charge, and temperature.

While running, the battery degree of discharge is primarily determined by a battery current sensor, which is integrated to obtain net amp hours.

In addition, the electrical power management function is designed to perform regulated voltage control to improve battery state of charge, battery life, and fuel economy. This is accomplished by using knowledge of the battery state of charge and temperature to set the charging voltage to an optimum battery voltage level for recharging without detriment to battery life.

Fig. 57: Charging Block Diagram

Courtesy of GENERAL MOTORS COMPANY

Charging System Components

Drive Motor/Generators

The drive motor/generators are serviceable components located within the transmission housing. When the rotors are spun, an alternating current (AC) is induced into the stator windings. This AC voltage is then sent to the drive motor generator power inverter module (PIM) where it is converted to high voltage direct current (DC) power. The output of the PIM is converted into low voltage electrical power by the accessory DC power converter module (APM) for use by the vehicle's electrical system to maintain electrical loads and battery charge.

Body Control Module (BCM)

The body control module (BCM) is a GMLAN device. It communicates with the engine control module (ECM) and the instrument panel cluster for electrical power management operation. The BCM determines the desired voltage set point and sends the information to the APM. The BCM monitors a battery current sensor, the battery positive voltage circuit, and estimated battery temperature to determine battery state of charge.

Battery Current Sensor

The battery current sensor is a serviceable component that is connected to the negative battery cable at the battery. The battery current sensor is a 3-wire hall effect current sensor. The battery current sensor monitors the battery current. It directly inputs to the BCM. It creates a 5 V pulse width modulation (PWM) signal of 128 Hz with a duty cycle of 0 - 100 percent. Normal duty cycle is between 5 - 95 percent. Between 0 - 5 percent and 95 - 100 percent are for diagnostic purposes.

Engine Control Module (ECM)

The ECM receives control decisions based on messages from the BCM.

Instrument Panel Cluster

The instrument panel cluster provides a means of customer notification in case of a failure and a voltmeter. There are 2 means of notification, a charge indicator and a driver information center message of SERVICE BATTERY CHARGING SYSTEM.

Charging System Operation

The purpose of the charging system is to maintain the battery charge and vehicle loads. There are 6 modes of operation and they include:

Battery Sulfation Mode Normal Mode

Fuel Economy Mode Headlamp Mode

Voltage Reduction Mode Plant Assembly Mode

Battery Sulfation Mode

Battery sulfation mode is used to help maintain the battery life. The charging system will enter a battery sulfation mode which tries to increase the vehicle charging when the charging system voltage is less than 13.2 V for about 30 minutes. Once in this mode, the BCM will set a targeted output voltage between 13.9 - 15.5 V for about 5 minutes. Following this 5 minutes, the BCM will then determine which mode to enter depending on the system voltage requirements.

Normal Mode

The BCM will enter Normal Mode whenever one of the following conditions are met.

The wipers are ON for more than 3 seconds.

GMLAN Climate Control Voltage Boost Mode Request is true, as sensed by the HVAC control head. High speed cooling fan, rear defogger and HVAC high speed blower operation can cause the BCM to enter the Charge Mode.

The estimated battery temperature is less than 0°C (32°F). Vehicle Speed is greater than 145 km/h (90 mph)

Current Sensor Fault Exists

System Voltage was determined to be below 12.56 V Tow/Haul Mode is enabled

When any one of these conditions is met, the system will set targeted generator output voltage to a charging voltage between 13.9 - 15.5 V, depending on the battery state of charge and estimated battery temperature.

Fuel Economy Mode

The BCM will enter Fuel Economy Mode when the ambient air temperature is at least 0°C (32°F) but less than or equal to 80°C (176°F), the calculated battery current is greater than -8 A but less than 5 A, and the battery state of charge is greater than or equal to 85 percent. Its targeted APM set-point voltage is the open circuit voltage of the battery and can be between 12.6 - 13.2 V. The BCM will exit this mode and enter Normal Mode when any of the conditions described above are present.

Headlamp Mode

The BCM will enter Headlamp Mode whenever the high or low beam headlamps are ON. Voltage will be regulated between 13.9 - 14.5 V.

Voltage Reduction Mode

The BCM will enter Voltage Reduction Mode when the calculated battery temperature is above 0°C (32°F) and the calculated battery current is greater than -7 A but less than 1 A. Its targeted APM set-point voltage is 12.9 - 13.2

V. The BCM will exit this mode once the criteria are met for Normal Mode.

Plant Assembly Mode

The BCM will increase charging voltage for the first 500 miles of operation in an effort to ensure that the 12 V battery is fully charged when the vehicle is delivered to the customer.

Instrument Panel Cluster Operation

Charge Indicator Operation

The instrument panel cluster illuminates the charge indicator and displays a charging system warning message in the driver information center when the one or more of the following occurs:

The engine control module (ECM) detects system voltage less than 11 V or greater than 16 V. The instrument panel cluster receives a GMLAN message from the ECM requesting illumination.

The BCM determines that the system voltage is less than 11 V or greater than 16 V.

The instrument panel cluster receives a GMLAN message from the BCM indicating there is a system voltage range concern.

The instrument panel cluster performs the displays test at the start of each Vehicle ON cycle. The indicator illuminates for approximately 3 seconds.

Vehicle ON, with the engine OFF.

Battery Voltage Gauge Operation

The instrument panel cluster displays the system voltage as received from the BCM over the GMLAN serial data circuit. If there is no communication with the BCM then the gauge will indicate minimum.

This vehicle is equipped with a regulated voltage control system. This will cause the voltmeter to fluctuate between 12 - 14 V, as opposed to non-regulated systems which usually maintain a more consistent reading of 14 V. This fluctuation with the regulated voltage control system is normal system operation and NO repairs should be attempted.

SERVICE BATTERY CHARGING SYSTEM

The BCM and the ECM will send a GMLAN message to the driver information center for the SERVICE BATTERY CHARGING SYSTEM message to be displayed. It is displayed whenever the charge indicator is commanded ON due to a failure.

STARTING SYSTEM DESCRIPTION AND OPERATION

The HQ1 hybrid system does not use a conventional starter. Refer to Hybrid Modes of Operation Description for information about the starting system.

SPECIAL TOOLS AND EQUIPMENT

SPECIAL TOOLS

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