< Назад | Содержимое | Далее >

‌SPECIFICATIONS

FASTENER SPECIFICATIONS

ACCESSORIES & EQUIPMENT

Lighting - Volt

Reusable Threaded Fastener Tightening Specifications

SCHEMATIC WIRING DIAGRAMS

HEADLIGHTS/DAYTIME RUNNING LIGHTS (DRL) WIRING SCHEMATICS

Daytime Running Lamps and Low Beams

Fig. 1: Daytime Running Lamps and Low Beams Courtesy of GENERAL MOTORS COMPANY

High Beams

Fig. 2: High Beams

Courtesy of GENERAL MOTORS COMPANY EXTERIOR LIGHTS WIRING SCHEMATICS

Front Turn Signals and Controls

Fig. 3: Front Turn Signals and Controls Courtesy of GENERAL MOTORS COMPANY

Park, Tail and License Lamps

Fig. 4: Park, Tail and License Lamps

Courtesy of GENERAL MOTORS COMPANY

Rear Turn Signals, Stop Lamps, and Backup Lamp

Fig. 5: Rear Turn Signals, Stop Lamps, and Backup Lamp Courtesy of GENERAL MOTORS COMPANY

INTERIOR LIGHTS WIRING SCHEMATICS

Interior Lights

Fig. 6: Interior Lights

Courtesy of GENERAL MOTORS COMPANY INTERIOR LIGHTS DIMMING WIRING SCHEMATICS

Display Dimming

Fig. 7: Display Dimming

Courtesy of GENERAL MOTORS COMPANY

Controls Dimming (1 of 2)

Fig. 8: Controls Dimming (1 of 2)

Courtesy of GENERAL MOTORS COMPANY

Controls Dimming (2 of 2)

Fig. 9: Controls Dimming (2 of 2)

Courtesy of GENERAL MOTORS COMPANY

DIAGNOSTIC INFORMATION AND PROCEDURES

DTC B1395: CONTROL MODULE VOLTAGE REFERENCE OUTPUT 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.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptors

DTC B1395 03

Control Module Voltage Reference Output Circuit Low Voltage

DTC B1395 07

Control Module Voltage Reference Output Circuit High Voltage

Diagnostic Fault Information

Circuit/System Description

The instrument panel dimmer switch is used to increase and decrease the brightness of the interior backlighting components. The instrument panel dimmer switch provides a voltage signal to the body control module (BCM) that will increase as the brightness of the lights are increased and decrease as the brightness of the lights are decreased. The BCM provides B+, low reference, and signal circuits to the instrument panel dimmer switch.

When the instrument panel dimmer switch is placed in the desired position, the dimmed voltage setting is applied from the instrument panel dimmer switch through the instrument panel dimmer switch signal circuit to the BCM. The BCM interprets the signal and applies a pulse width modulated (PWM) voltage through the LED dimming control circuits illuminating the interior backlighting to the requested level of brightness.

Conditions for Running the DTC

Battery voltage must be between 9 - 16 V. Park lamps ON.

Conditions for Setting the DTC

DTC B1395 03

The BCM detects a short to ground in the instrument panel dimmer switch B+ reference circuit. The BCM detects a short to ground in the instrument panel dimmer switch signal circuit.

DTC B1395 07

The BCM detects a short to voltage in the instrument panel dimmer switch B+ reference circuit. The BCM detects a short to voltage in the instrument panel dimmer switch signal circuit.

Actions Taken When the DTC Sets

All interior backlighting defaults to FULL bright.

Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists.

A history DTC will clear once 100 consecutive malfunction-free vehicle ON/OFF switch cycles have occurred.

Reference Information

Schematic Reference

Interior Lights Dimming Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Interior Lighting Systems 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 and all vehicle systems OFF, disconnect the harness connector at the S30 Headlamp Switch, vehicle in Service Mode.

2. Test for B+ between the B+ circuit terminal 12 and ground.

If less than B+

1. Vehicle OFF, disconnect the X1 harness connector at the K9 Body Control Module, vehicle in Service Mode.

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

3. 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, replace the K9 Body Control Module.

If B+

3. Test for B+ between the B+ circuit terminal 12 and the low reference circuit terminal 7.

If less than B+

1. Vehicle OFF, disconnect the X1 harness connector at the K9 Body Control Module, vehicle in Service Mode.

2. Test for less than 1 V between the low reference circuit terminal 7 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 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 B+

4. Verify a test lamp does not illuminate between the B+ circuit terminal 12 and the signal circuit terminal 11.

If the test lamp illuminates

1. Vehicle OFF, disconnect the X2 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, replace the K9 Body Control Module.

If the test lamp does not illuminate

5. Test for B+ between the B+ circuit terminal 12 and the signal circuit terminal 11.

If less than B+

1. Vehicle OFF, disconnect the X2 harness connector at the K9 Body Control Module, vehicle in Service Mode.

2. 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

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 B+

6. Test or replace the S30 Headlamp Switch.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Headlamp Switch Replacement

Refer to Control Module References for BCM replacement, programming and setup

DTC B1480: BATTERY RUNDOWN PROTECTION 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.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptor

DTC B1480 02

Battery Rundown Protection Circuit Short to Ground

Diagnostic Fault Information

Circuit/System Description

The body control module (BCM) supplies battery voltage to the front reading lamps and left and right sunshade lamps via the courtesy lamp control circuit. When a sunshade mirror is opened, the switch contact close allowing battery voltage to flow illuminating the respective lamps. The front reading lamps are controlled by individual switches that are activated by the operator when additional cabin lighting is required. In the event that any of these courtesy lamps were to remain illuminated for more than 10 min with the vehicle ON/OFF switch in the OFF position and no doors opened, the BCM will deactivate the courtesy lamp control circuit to prevent total battery discharge.

Conditions for Running the DTC

Battery voltage must be between 9 - 16 V.

Conditions for Setting the DTC

The BCM detects a short to ground in the courtesy lamp control circuit.

Actions Taken When the DTC Sets

The BCM will disable the circuit and the sunshade lamps and front reading lamps will be inoperative.

Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists.

A history DTC will clear once 100 consecutive malfunction-free vehicle ON/OFF switch cycles have occurred.

Reference Information

Schematic Reference

Interior Lights Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Interior Lighting Systems 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, exterior lamps OFF, disconnect the harness connectors at the components listed below. S48B Multifunction Switch - Overhead Console

E37R Dome/Reading Lamps - Rear E31L Sunshade Mirror Lamp - Left

E31R Sunshade Mirror Lamp - Right

2. Connect a test lamp between the appropriate control circuit terminal listed below and ground, vehicle in Service Mode.

S48B Multifunction Switch - Overhead Console terminal 7 E37R Dome/Reading Lamps - Rear terminal A

E31L Sunshade Mirror Lamp - Left terminal A

E31R Sunshade Mirror Lamp - Right terminal A

3. Verify the test lamp turns ON and OFF when commanding the Inadvertent Load ON and OFF with a scan tool.

If the test lamp is always OFF

1. Vehicle OFF, disconnect the X7 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, disconnect the X7 harness connector at the K9 Body Control Module, vehicle in

Service Mode.

2. Test for less than 1 V between the control circuit terminal 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 appropriate courtesy lamp.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair. Refer to Sunshade Illuminated Mirror Lamp Bulb Replacement

Refer to Center Reading Lamp Replacement

Refer to Control Module References for BCM replacement, programming, and setup

DTC B2545: BACKUP LAMPS 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.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptors

DTC B2545 01

Backup Lamps Circuit Short to Battery

DTC B2545 02

Backup Lamps Circuit Short to Ground

DTC B2545 04

Backup Lamps Circuit Open

Diagnostic Fault Information

Circuit/System Description

With the vehicle ON and the transmission in the reverse position, the transmission control module (TCM) sends a serial data message to the body control module (BCM). The message indicates that the gear selector is in the

reverse position. The BCM applies battery voltage to the backup lamp control circuit illuminating the backup lamp. Once the driver moves the gear selector out of the reverse position, a message is sent by the TCM via serial data requesting the BCM to remove battery voltage from the backup lamp control circuit. The vehicle must be ON for the backup lamps to operate.

Conditions for Running the DTC

Battery voltage must be between 9-16 V. Vehicle ON.

Transmission placed in REVERSE gear.

Conditions for Setting the DTC

DTC B2545 01 and B2545 04

The BCM detects an open/high resistance in the backup lamp control circuit.

DTC B2545 02

The BCM detects a short to ground in the backup lamp control circuit.

Actions Taken When the DTC Sets The backup lamp will not operate. Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists.

A history DTC will clear once 100 consecutive malfunction-free vehicle ON/OFF switch cycles have occurred.

Reference Information

Schematic Reference

Exterior Lights Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Exterior Lighting Systems 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, exterior lamps OFF, disconnect the harness connector at the E5 Backup Lamp, vehicle in Service Mode.

2. Test for less than 10 Ω between the ground circuit at the socket 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. Connect a test lamp between the control circuit at the socket terminal and ground, vehicle in Service Mode.

4. Verify the test lamp turns ON and OFF when commanding the Backup Lamps ON and OFF with a scan tool.

If the test lamp is always OFF

1. Vehicle OFF, disconnect the X7 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, disconnect the X7 harness connector at the K9 Body Control Module, vehicle in Service Mode.

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

5. Test or replace the E5 Backup Lamp.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Backup Lamp Bulb Replacement

Refer to Control Module References for BCM replacement, programming, and setup

DTC B255D: PASSENGER COMPARTMENT LAMP CONTROL 2 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.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptors

DTC B255D 01

Passenger Compartment Lamp Control 2 Circuit Short to Battery

DTC B255D 02

Passenger Compartment Lamp Control 2 Circuit Short to Ground

DTC B255D 04

Passenger Compartment Lamp Control 2 Circuit Open

Diagnostic Fault Information

Circuit/System Description

The instrument panel dimmer switch is used to increase and decrease the brightness of the interior backlighting

components. The instrument panel dimmer switch provides a voltage signal to the body control module (BCM) that will increase as the brightness of the lights are increased and decrease as the brightness of the lights are decreased. The BCM provides B+, signal, and low reference circuits to the instrument panel dimmer switch.

When the instrument panel dimmer switch is placed in the desired position, the dimmed voltage setting is applied from the instrument panel dimmer switch through the instrument panel dimmer switch signal circuit to the BCM. The BCM interprets the signal and applies a pulse width modulated voltage through the LED dimming control circuits illuminating the interior backlighting to the requested level of brightness.

Conditions for Running the DTC

Battery voltage must be between 9-16 V.

Conditions for Setting the DTC

DTC B255D 01

The BCM detects a short to voltage in the courtesy lamps control circuit terminal 23 X1.

DTC B255D 02

The BCM detects a short to ground in the courtesy lamps control circuit terminal 23 X1.

DTC B255D 04

The BCM detects an open/high resistance in the courtesy lamps control circuit terminal 23 X1.

Actions Taken When the DTC Sets

The BCM will disable the courtesy lamps control circuit terminal 23 X1.

Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists. Turn the ignition OFF and wait 30 s.

A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Reference Information

Schematic Reference

Interior Lights Dimming Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Interior Lighting Systems 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. Ignition OFF, exterior lamps OFF, disconnect the harness connector at the inoperative courtesy lamp.

2. Connect a test lamp between the appropriate control circuit terminal listed below and ground, vehicle in Service Mode.

E1D Accent Lamp - Driver Door terminal 2

E1P Accent Lamp - Passenger Door terminal 2

E63D Flood Lamp - Driver Door Handle terminal 1

E63LR Flood Lamp - Left Rear Door Handle terminal 1 E63RR Flood Lamp - Right Rear Door Handle terminal 1 E63P Flood Lamp - Passenger Door Handle terminal 1

E1W Accent Lamp - Instrument Panel terminal 3

S48B Multifunction Switch - Overhead Console terminal 2

3. Verify the test lamp turns ON and OFF when commanding the Accent Lighting ON and OFF with a scan tool.

If the test lamp is always OFF

1. Ignition OFF, disconnect the X1 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. Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module, vehicle in Service Mode.

2. Test for less than 1 V between the control circuit terminal 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 appropriate courtesy lamp.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Front Side Door Inside Handle Illumination Lamp Replacement

Refer to Rear Side Door Inside Handle Illumination Lamp Replacement

Refer to Control Module References for BCM replacement, programming, and setup

DTC B2570: TRUNK LAMP CONTROL 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.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptor

DTC B2570 02

Trunk Lamp Control Circuit Short to Ground

Diagnostic Fault Information

Circuit/System Description

The body control module (BCM) applies battery voltage to the cargo lamp through the cargo lamp control circuit. When the BCM receives a rear liftgate open input from the rear compartment lid latch, the BCM applies battery voltage to the cargo lamp control circuit illuminating the cargo lamp. In the event that the cargo lamp were to remain illuminated for more than 10 min with the vehicle ON/OFF switch in the OFF position, the BCM will deactivate the cargo lamp control circuit to prevent total battery discharge.

Conditions for Running the DTC

Battery voltage must be between 9-16 V. Liftgate OPEN.

Conditions for Setting the DTC

The BCM detects a short to ground in the cargo lamp control circuit.

Actions Taken When the DTC Sets The cargo lamp is inoperative. Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists.

A history DTC will clear once 100 consecutive malfunction-free vehicle ON/OFF switch cycles have occurred.

Reference Information

Schematic Reference

Interior Lights Schematics

Body Control System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Interior Lighting Systems 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, exterior lamps OFF, disconnect the harness connector at the E33 Cargo Lamp. It may take up to 2 min for all vehicle systems to power down.

2. Test for less than 5 Ω between the ground circuit terminal 2 and ground.

If 5 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 5 Ω

3. Connect a test lamp between the control circuit terminal 1 and ground, vehicle in Service Mode.

4. Verify the test lamp turns ON and OFF when commanding the Cargo Lamp ON and OFF with a scan tool.

If the test lamp is always OFF

1. Vehicle OFF, disconnect the X7 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, disconnect the X7 harness connector at the K9 Body Control Module, vehicle in Service Mode.

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

5. Test or replace the E33 Cargo Lamp.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Cargo Center Courtesy Lamp Bulb Replacement

Refer to Control Module References for BCM replacement, programming, and setup

DTC B2575 OR B2699: LEFT HEADLAMP CONTROL CIRCUIT/RIGHT HEADLAMP CONTROL 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.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptors

DTC B2575 01

Headlamps Control Circuit Short to Battery

DTC B2575 02

Headlamps Control Circuit Short to Ground

DTC B2575 04

Headlamps Control Circuit Open

DTC B2699 01

Right Headlamp Control Circuit Short to Battery

DTC B2699 02

Right Headlamp Control Circuit Short to Ground

DTC B2699 04

Right Headlamp Control Circuit Open

Diagnostic Fault Information

Circuit/System Description

With the headlamp switch in the ON position, the headlamp switch headlamp ON signal circuit is grounded through the headlamp switch. The body control module (BCM) responds by applying battery positive voltage to the left and right low beam headlamp control circuits illuminating the low beam headlamps.

Conditions for Running the DTC

Battery voltage must be between 9-16 V. Low beam headlamps ON.

Conditions for Setting the DTC

DTC B2575 01 and B2575 04

The BCM detects an open/high resistance in the left low beam headlamp control circuit.

DTC B2575 02

The BCM detects a short to ground in the left low beam headlamp control circuit.

DTC B2699 01 and B2699 04

The BCM detects an open/high resistance in the right low beam headlamp control circuit.

DTC B2699 02

The BCM detects a short to ground in the right low beam headlamp control circuit.

Actions Taken When the DTC Sets

When DTC B2575 sets, the left low beam headlamp will be inoperative. When DTC B2699 sets, the right low beam headlamp will be inoperative.

Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists.

A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Reference Information

Schematic Reference

Headlights/Daytime Running Lights (DRL) Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Exterior Lighting Systems 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

DTC B2575

1. Vehicle OFF, exterior lamps OFF, disconnect the harness connector at the E4G Headlamp - Left Low Beam.

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. Connect a test lamp between the control circuit terminal 4 and ground, vehicle in Service Mode.

4. Verify the test lamp turns ON and OFF when commanding the Left Headlamp Low Beam ON and OFF

with a scan tool.

If the test lamp is always OFF

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

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

5. Test or replace the E4G Headlamp - Left Low Beam.

DTC B2699

1. Vehicle OFF, exterior lamps OFF, disconnect the harness connector at the E4H Headlamp - Right Low Beam.

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. Connect a test lamp between the control circuit terminal 4 and ground, vehicle in Service Mode.

4. Verify the test lamp turns ON and OFF when commanding the Right Headlamp Low Beam ON and OFF with a scan tool.

If the test lamp is always OFF

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

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

5. Test or replace the E4H Headlamp - Right Low Beam.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Headlamp Bulb Replacement (Left Side)Headlamp Bulb Replacement (Right Side)

Refer to Headlamp Replacement

Refer to Control Module References for BCM replacement, programming and setup

DTC B257A: HEADLAMP SWITCH INPUT SIGNALS CORRELATION 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.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptor

DTC B257A 00

Headlamp Switch Input Signals Correlation Malfunction

Diagnostic Fault Information

Circuit/System Description

For headlamp operation, the body control module (BCM) monitors three signal circuits from the headlamp

switch. When the headlamp switch is in the AUTO position, the three signal circuits are open and the BCM relies on the ambient light sensor input to turn the headlamps and daytime running lamps (DRLs) ON and OFF. When the headlamp switch is placed in the OFF position, the headlamp switch headlamps OFF signal circuit is grounded, indicating to the BCM that the exterior lamps should be turned OFF. With the headlamp switch in the PARK LAMPS position, the headlamp switch park lamps ON signal circuit is grounded, indicating that the park lamps have been requested. When the headlamp switch is in the HEADLAMP position, both the headlamp switch park lamps ON signal circuit and the headlamp switch headlamps ON signal circuit are grounded. The BCM responds by commanding the park lamps and headlamps ON.

Conditions for Running the DTC

Battery voltage must be between 9-16 V.

Conditions for Setting the DTC

The BCM detects an open/high resistance in the headlamp switch park lamps ON signal circuit. The BCM detects a short to ground in the headlamp switch headlamps ON signal circuit.

The BCM detects a short to ground in the headlamp switch headlamps OFF signal circuit.

Actions Taken When the DTC Sets

When DTC B257A 00 is present on the headlamp switch headlamps OFF signal circuit, the low beam and high beam headlamps are inoperative.

When DTC B257A 00 is present on the headlamp switch headlamps ON signal circuit, the low beam headlamps are always ON in the PARK position and the park lamps are always ON in all positions.

When DTC B257A 00 is present on the headlamp switch park lamps ON signal circuit, the high beam and low beam headlamps are inoperative in the PARK and HEAD positions.

Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists.

A history DTC will clear once 100 consecutive malfunction-free vehicle ON/OFF switch cycles have occurred.

Reference Information

Schematic Reference

Headlights/Daytime Running Lights (DRL) Schematics Exterior Lights Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Exterior Lighting Systems 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, all doors closed, all accessories OFF, disconnect the harness connector at the S30 Headlamp Switch. It may take up to 2 min for all vehicle systems to power down.

2. Test for less than 5 Ω between the ground circuit terminal 8 and ground.

If 5 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 5 Ω

3. Vehicle in Service Mode.

4. Verify the scan tool Automatic Headlamps Disable Switch parameter is Inactive.

If not Inactive

1. Vehicle OFF, disconnect the X1 harness connector at the K9 Body Control Module.

2. 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 K9 Body Control Module.

If Inactive

5. Install a 3 A fused jumper wire between the signal circuit terminal 3 and the ground circuit terminal 8.

6. Verify the scan tool Automatic Headlamps Disable Switch parameter is Active.

If not Active

1. Vehicle OFF, disconnect the X1 harness connector at the K9 Body Control Module, vehicle in Service Mode.

2. Test for less than 1 V between the signal circuit terminal 3 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 Active

7. Verify the scan tool Park Lamps Switch parameter is Inactive.

If not Inactive

1. Vehicle OFF, disconnect the X1 harness connector at the K9 Body Control Module.

2. Test for infinite resistance between the signal circuit terminal 5 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 Inactive

8. Install a 3 A fused jumper wire between the signal circuit terminal 5 and the ground circuit terminal 8.

9. Verify the scan tool Park Lamps Switch parameter is Active.

If not Active

1. Vehicle OFF, disconnect the X1 harness connector at the K9 Body Control Module, vehicle in Service Mode.

2. Test for less than 1 V between the signal circuit terminal 5 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 Active

10. Verify the scan tool Headlamps On Switch parameter is Inactive.

If not Inactive

1. Vehicle OFF, disconnect the X1 harness connector at the K9 Body Control Module.

2. Test for infinite resistance between the signal circuit terminal 1 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 Inactive

11. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the ground circuit terminal 8.

12. Verify the scan tool Headlamps On Switch parameter is Active.

If not Active

1. Vehicle OFF, disconnect the X1 harness connector at the K9 Body Control Module, vehicle in Service Mode.

2. Test for less than 1 V between the signal circuit terminal 1 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 Active

13. Test or replace the S30 Headlamp Switch.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Headlamp Switch Replacement

Refer to Control Module References for BCM replacement, programming, and setup

DTC B2580: HEADLAMP HIGH BEAM CONTROL 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.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptors

DTC B2580 01

Headlamp High Beam Control Circuit Short to Battery

DTC B2580 02

Headlamp High Beam Control Circuit Short to Ground

DTC B2580 04

Headlamp High Beam Control Circuit Open

Diagnostic Fault Information

Circuit/System Description

The high beam and flash to pass functions are contained within the turn signal/multifunction switch. The BCM provides the turn signal/multifunction switch with two signal circuits, the high beam signal circuit and the flash to pass signal circuit. When the low beam headlamps are ON and the turn signal/multifunction switch is placed in the high beam position, ground is applied to the BCM through the high beam signal circuit. The BCM responds to the high beam request by applying ground to the high beam relay control circuit which energizes the

high beam relay. With the high beam relay energized, the switch contacts close allowing battery voltage to flow through the high beam fuses to the high beam control circuits illuminating the high beam headlamps.

Conditions for Running the DTC

Battery voltage must be between 9 - 16 V. High beam headlamps ON.

Conditions for Setting the DTC

DTC B2580 01

The BCM detects a short to voltage in the headlamp high beam relay control circuit.

DTC B2580 02 and B2580 04

The BCM detects a short to ground or an open/high resistance in the headlamp high beam relay control circuit.

Actions Taken When the DTC Sets

For an open/high resistance fault, the high beam headlamps and flash to pass function are inoperative.

The high beam indicator on the instrument cluster operates normally.

For a short to ground fault, the high beam headlamps and high beam indicator on the instrument cluster are always ON with the headlamp switch in the AUTO or HEAD positions.

For a short to voltage fault, the high beam headlamps and flash to pass function are inoperative.

Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists.

A history DTC will clear once 100 consecutive malfunction-free vehicle ON/OFF switch cycles have occurred.

Reference Information

Schematic Reference

Exterior Lights Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Exterior Lighting Systems 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 X5 harness connector at the K9 Body Control Module, vehicle in Service Mode.

2. Verify a test lamp illuminates between the control circuit terminal 18 and ground.

If the test lamp does not illuminate

1. Vehicle OFF, disconnect the X2 harness connector at the X50A Fuse Block - Underhood.

2. Test for infinite resistance between the control circuit terminal 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 X50A Fuse Block - Underhood.

If the test lamp illuminates

3. Vehicle OFF, connect a 3 A fused jumper between the control circuit terminal 18 and ground, vehicle in Service Mode, low beams ON.

4. Verify the high beam headlamps illuminate.

If the high beam headlamps do not illuminate

1. Vehicle OFF, disconnect the X2 harness connector at the X50A Fuse Block - Underhood, vehicle in Service Mode.

2. Test for less than 1 V between the control circuit terminal 18 and ground. If 1 V or greater, repair the short to voltage on the circuit.

If less than 1 V, replace the X50A Fuse Block - Underhood.

If the high beam headlamps illuminate

5. Replace the K9 Body Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Fuse Block Replacement

Refer to Control Module References for BCM replacement, programming, and setup

DTC B2585 OR B3867: LEFT PARK LAMPS CONTROL CIRCUIT/RIGHT PARK LAMPS CONTROL 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.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptors

DTC B2585 01

Left Park Lamps Control Circuit Short to Battery

DTC B2585 02

Left Park Lamps Control Circuit Short to Ground

DTC B2585 04

Left Park Lamps Control Circuit Open

DTC B3867 01

Right Park Lamp Control Circuit Short to Battery

DTC B3867 02

Right Park Lamp Control Circuit Short to Ground

DTC B3867 04

Right Park Lamp Control Circuit Open

Diagnostic Fault Information

Circuit/System Description

When the headlamp switch is placed in the HEAD or PARK position, ground is applied to the park lamps ON signal circuit to the body control module (BCM). The BCM responds by applying voltage to the park lamps, tail lamps, and license lamps control circuits illuminating the park, tail, and license lamps.

Conditions for Running the DTC

Battery voltage must be between 9 - 16 V. Park lamps ON.

Conditions for Setting the DTC

DTC B2585 01 and B2585 04

The BCM detects a short to voltage or an open/high resistance in the left front park lamp control circuit. The BCM detects an open/high resistance in the left front park lamp ground circuit.

DTC B2585 02

The BCM detects a short to ground in the left front park lamp control circuit.

DTC B3867 01 and B3867 04

The BCM detects a short to voltage or an open/high resistance in the right front park lamp control circuit. The BCM detects an open/high resistance in the right front park lamp ground circuit.

DTC B3867 02

The BCM detects a short to ground in the right front park lamp control circuit.

Actions Taken When the DTC Sets

DTC B2585 01

The left front park lamp is always ON.

DTC B2585 02 and B2585 04

The left front park lamp is inoperative.

DTC B3867 01

The right front park lamp is always ON.

DTC B3867 02 and B3867 04

The right front park lamp is inoperative.

Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists.

A history DTC will clear once 100 consecutive malfunction-free vehicle ON/OFF switch cycles have occurred.

Reference Information

Schematic Reference

Exterior Lights Schematics

Body Control System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Exterior Lighting Systems 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

DTC B2585

1. Vehicle OFF, exterior lamps OFF, disconnect the harness connector at the appropriate park lamp listed below.

E4AC Park/Daytime Running Lamp - Left E2LF Side Marker Lamp - Left Front

E42L Tail Lamp Assembly - Left

2. Test for less than 10 Ω between the appropriate ground circuit terminal listed below and ground. E4AC Park/Daytime Running Lamp - Left terminal 3

E2LF Side Marker Lamp - Left Front terminal B

E42L Tail Lamp Assembly - Left terminal 6

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. Connect a test lamp between the appropriate control circuit terminal listed below and ground, vehicle in Service Mode.

E4AC Park/Daytime Running Lamp - Left terminal 2 E2LF Side Marker Lamp - Left Front terminal A

E42L Tail Lamp Assembly - Left terminal 2

4. Verify the test lamp turns ON and OFF when commanding the Left Front Park Lamp ON and OFF with a scan tool.

If the test lamp is always OFF

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

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

5. Test or replace the left park lamp.

DTC B3867

1. Vehicle OFF, exterior lamps OFF, disconnect the harness connector at the appropriate park lamp listed below.

E4AD Park/Daytime Running Lamp - Right E2RF Side Marker Lamp - Right Front

E42R Tail Lamp Assembly - Right

2. Test for less than 10 Ω between the appropriate ground circuit terminal listed below and ground. E4AD Park/Daytime Running Lamp - Right terminal 3

E2RF Side Marker Lamp - Right Front terminal B E42R Tail Lamp Assembly - Right terminal 6

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. Connect a test lamp between the appropriate control circuit terminal listed below and ground, vehicle in Service Mode.

E4AD Park/Daytime Running Lamp - Right terminal 2 E2RF Side Marker Lamp - Right Front terminal A

E42R Tail Lamp Assembly - Right terminal 2

4. Verify the test lamp turns ON and OFF when commanding the Right Front Park Lamp ON and OFF with a scan tool.

If the test lamp is always OFF

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

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

5. Test or replace the right park lamp.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Front Turn Signal Lamp Bulb Replacement

Refer to Stop and Tail Lamp Bulb Replacement

Refer to Daytime Running Lamp Replacement

Refer to Control Module References for BCM replacement, programming, and setup

DTC B2600 OR B2605: LEFT DAYTIME RUNNING LAMPS CONTROL CIRCUIT SHORT TO GROUND/RIGHT DAYTIME RUNNING LAMPS CONTROL 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.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptors

DTC B2600 02

Left Daytime Running Lamps Control Circuit Short to Ground

DTC B2605 02

Right Daytime Running Lamps Control Circuit Short to Ground

Diagnostic Fault Information

Circuit/System Description

The ambient light/sunload sensor is used to monitor outside lighting conditions. The ambient light/sunload sensor provides a serial data message to the body control module (BCM) based on outside lighting conditions to determine if outside lighting conditions are correct for either daytime running lamps or automatic lamp control when the headlamp switch is in the AUTO position. In daylight conditions the BCM will command the designated daytime running lamps ON. During low light conditions the BCM will command the low beam headlamps ON. Any function or condition that turns on the headlamps will cancel daytime running lamps operation.

Conditions for Running the DTC

Battery voltage must be between 9-16 V.

Conditions for Setting the DTC

DTC B2600 02

The BCM detects a short to ground in the left daytime running lamp control circuit.

DTC B2605 02

The BCM detects a short to ground in the right daytime running lamp control circuit.

Actions Taken When the DTC Sets

DTC B2600 02

The left daytime running lamp is inoperative.

DTC B2605 02

The right daytime running lamp is inoperative.

Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists.

A history DTC will clear once 100 consecutive malfunction-free vehicle ON/OFF switch cycles have occurred.

Diagnostic Aids

The daytime running lamps will only operate in daylight conditions with the vehicle ON and in any transmission gear except PARK.

Reference Information

Schematic Reference

Headlights/Daytime Running Lights (DRL) Schematics Body Control System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Exterior Lighting Systems 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, exterior lamps OFF, disconnect the harness connector at the inoperative E4A Park/Daytime Running Lamp.

2. Test for less than 10 Ω between the ground circuit terminal 3 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. Connect a test lamp between the control circuit terminal 1 and ground, vehicle ON.

4. Verify the test lamp turns ON and OFF when commanding the appropriate Dedicated Daytime Running Lamp ON and OFF with a scan tool.

If the test lamp is always OFF

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

X5 - left daytime running lamp X7 - right daytime running lamp

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, disconnect the appropriate harness connector listed below at the K9 Body Control Module, vehicle ON.

X5 - left daytime running lamp X7 - right daytime running lamp

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

5. Test or replace the appropriate E4A Park/Daytime Running Lamp.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Daytime Running Lamp Replacement

Refer to Control Module References for BCM replacement, programming, and setup

DTC B2610: PASSENGER COMPARTMENT DIMMING 1 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.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptors

DTC B2610 01

Passenger Compartment Dimming 1 Circuit Short to Battery

DTC B2610 02

Passenger Compartment Dimming 1 Circuit Short to Ground

DTC B2610 04

Passenger Compartment Dimming 1 Circuit Open

Diagnostic Fault Information

Circuit/System Description

The headlamp switch is used to increase and decrease the brightness of the interior backlighting components. The headlamp switch provides a voltage signal to the body control module (BCM) that will increase as the brightness of the lights are increased and decrease as the brightness of the lights are decreased. The BCM provides a B+, low reference, and signal circuits to the headlamp switch. When the headlamp switch is placed in the desired position, the dimmed voltage setting is applied from the headlamp switch through the headlamp switch signal circuit to the BCM. The BCM interprets the signal and applies a pulse width modulated (PWM) voltage through the LED dimming control circuits illuminating the interior backlighting to the requested level of brightness.

Conditions for Running the DTC

Battery voltage must be between 9 - 16 V. Park lamps ON.

Conditions for Setting the DTC

DTC B2610 01

The BCM detects a short to battery in the LED backlight dimming control circuit terminal 8 X2 or the LED backlight dimming control circuit terminal 9 X7.

DTC B2610 02

The BCM detects a short to ground in the LED backlight dimming control circuit terminal 8 X2 or the LED backlight dimming control circuit terminal 9 X7.

DTC B2610 04

The BCM detects an open/high resistance in the LED backlight dimming control circuit terminal 8 X2 or the LED backlight dimming control circuit terminal 9 X7.

Actions Taken When the DTC Sets

The BCM will disable the LED backlight dimming control circuits.

Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists.

A history DTC will clear once 100 consecutive malfunction-free vehicle ON/OFF switch cycles have occurred.

Reference Information

Schematic Reference

Interior Lights Dimming Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Interior Lighting Systems 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

NOTE: Each component with backlighting may need to be disconnected to isolate a short to voltage or short to ground. Use the schematics to identify the following:

Backlighting components the vehicle is equipped with Each component's control and ground circuit terminals

Component locations on the backlighting control circuit

1. Vehicle OFF, all doors closed, all accessories OFF, disconnect the harness connector at the component with inoperative backlighting. It may take up to 2 min for all vehicle systems to power down.

2. Test for less than 5 Ω between the appropriate ground circuit terminal and ground.

If 5 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 5 Ω

3. Connect a test lamp between the appropriate control circuit terminal and ground, vehicle in Service Mode.

4. Verify the test lamp turns ON and OFF when commanding the LED Backlight Dimming ON and OFF with a scan tool.

If the test lamp is always OFF

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

X2 terminal 8

X7 terminal 9

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, disconnect the appropriate harness connector listed below at the K9 Body Control Module, vehicle in Service Mode

X2 terminal 8

X7 terminal 9

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

5. Test or replace the component with inoperative backlighting.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Parking Brake Actuator Switch Replacement

Refer to Center Reading Lamp Replacement

Refer to Headlamp Switch Replacement

Refer to Door Lock Switch Replacement - Driver Side

Refer to Door Lock Switch Replacement - Passenger Front

Refer to Interior Lamp and Multifunction Switch Replacement

Refer to Fuel Tank Filler Door Lock Release Switch Replacement

Refer to Steering Wheel Spoke Cover Replacement

Refer to Radio Control Switch Replacement - Steering Wheel (Left Side Rear) Radio Control Switch Replacement - Steering Wheel (Right Side Rear) Radio Control Switch Replacement - Steering Wheel (Right Side Front) Radio Control Switch Replacement - Steering Wheel (Left Side Lower)

Refer to Control Module References for BCM replacement, programming, and setup

DTC B2615: PASSENGER COMPARTMENT DIMMING 2 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.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptor

DTC B2615 02

Passenger Compartment Dimming 2 Circuit Short to Ground

Diagnostic Fault Information

Circuit/System Description

The dome lamp switch has 3 positions: DOOR, OFF, and ON. The ON position provides a ground for continuous operation and the dome lamps will remain illuminated until the switch is placed in either the DOOR or OFF position. When in the DOOR position, the dome lamps operation is controlled by the body control module (BCM). When any door is opened, the door ajar switch contacts close and the BCM receives a door- open input. The BCM illuminates the dome lamps when any door is opened or a door lock/unlock request is activated with the key fob. After all doors have been closed, the dome lamps will remain illuminated approximately 3 seconds after the last door closes. When the driver places the dome lamp switch in the OFF position, the dome lamps will be disabled. In the event that the dome lamps were to remain illuminated for more

than 10 minutes with the vehicle ON/OFF switch in the OFF position and no doors opened, the BCM will deactivate the dome lamps control circuit to prevent total battery discharge.

Conditions for Running the DTC

Battery voltage must be between 9 - 16 V.

Conditions for Setting the DTC

The BCM detects a short to ground in the dome lamps control circuit.

The BCM detects a short to ground or an open/high resistance in the F5DA (BCM 2) fuse B+ circuit.

Actions Taken When the DTC Sets

The front and middle dome lamps are inoperative.

Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists.

A history DTC will clear once 100 consecutive malfunction-free vehicle ON/OFF switch cycles have occurred.

Diagnostic Aids

When the F5DA (BCM 2) fuse is open, both dome lamps, sunshade lamps, reading lamps, and backup lamps will be inoperative. DTC B2545 will also set for the backup lamps when the vehicle is placed in the reverse gear.

Reference Information

Schematic Reference

Interior Lights Schematics

Body Control System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Interior Lighting Systems 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 X1 harness connector at the K9 Body Control Module, vehicle in Service Mode.

2. Verify a test lamp illuminates between the B+ 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 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 K9 Body Control Module.

If the test lamp illuminates

3. Vehicle OFF, connect the X1 harness connector at the K9 Body Control Module.

4. Vehicle OFF, scan tool disconnected, all doors closed, all accessories OFF, disconnect the harness connector at the inoperative component listed below. It may take up to 2 min for all vehicle systems to power down.

S48B Multifunction Switch - Overhead Console E37R Dome/Reading Lamps - Rear

E1W Accent Lamp - Instrument Panel

5. Test for less than 5 Ω between the ground circuit terminals listed below and ground. S48B Multifunction Switch - Overhead Console terminal 5

E37R Dome/Reading Lamps - Rear terminal B

E1W Accent Lamp - Instrument Panel terminal 2

If 5 Ω or greater

1. Vehicle OFF.

2. Test for less than 2 Ω in the ground circuits 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 5 Ω

6. Connect a test lamp between the control circuit terminals listed below and ground. S48B Multifunction Switch - Overhead Console terminal 8

E37R Dome/Reading Lamps - Rear terminal C

E1W Accent Lamp - Instrument Panel terminal 1

7. Verify the test lamp turns ON and OFF when commanding the Courtesy Lamps ON and OFF with a scan

tool.

If the test lamp is always OFF

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

X7 - S48B Multifunction Switch - Overhead Console and E37R Dome/Reading Lamps - Rear

X2 - E1W Accent Lamp - Instrument Panel

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, disconnect the appropriate harness connector listed below at the K9 Body Control Module, vehicle in Service Mode.

X7 - S48B Multifunction Switch - Overhead Console and E37R Dome/Reading Lamps - Rear

X2 - E1W Accent Lamp - Instrument Panel

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

8. Test or replace the inoperative dome/reading lamp.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Center Reading Lamp Replacement

Refer to Front Floor Console Bin Lamp Replacement

Refer to Control Module References for BCM replacement, programming, and setup

DTC B2625: DISPLAY DIMMING PULSE WIDTH MODULATION OUTPUT 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.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptor

DTC B2625 02

Display Dimming Pulse Width Modulation Output Circuit Short to Ground

Diagnostic Fault Information

Circuit/System Description

The body control module (BCM) applies battery voltage to the amber switch indicators through the amber LED indicator control circuit. When the appropriate switch has been activated, the BCM applies a pulse width modulated voltage through the amber LED indicator control circuit illuminating the rear seat heating switches, overhead console multifunction switch, and center console multifunction switch amber LEDs.

Conditions for Running the DTC

Battery voltage must be between 9 - 16 V. Park lamps ON.

Conditions for Setting the DTC

The BCM detects a short to ground in the switch indicator LED backlight dimming control circuit terminal 5 X1.

Actions Taken When the DTC Sets

The switch indicator LED backlight dimming control circuit terminal 5 X1 driver is shut down.

Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists.

A history DTC will clear once 100 consecutive malfunction-free vehicle ON/OFF switch cycles have occurred.

Reference Information

Schematic Reference

Interior Lights Dimming Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Interior Lighting Systems 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 harness connectors at the components listed below. S32LR Seat Heating Switch - Left Rear

S32RR Seat Heating Switch - Right Rear

S48B Multifunction Switch - Overhead Console S48E Multifunction Switch - Center Console

NOTE: The test lamp in the following step will illuminate at LOW intensity. This is normal circuit operation and does not indicate a circuit malfunction.

2. Vehicle in Service Mode, verify a test lamp illuminates between each control circuit terminal listed below and ground.

S32LR Seat Heating Switch - Left Rear terminal 6 S32RR Seat Heating Switch - Right Rear terminal 6

S48B Multifunction Switch - Overhead Console terminal 18 S48E Multifunction Switch - Center Console terminal 3

If the test lamp does not illuminate

1. Vehicle OFF, disconnect the X1 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

3. Verify a test lamp does not illuminate at FULL intensity between each control circuit terminal listed below and ground.

S32LR Seat Heating Switch - Left Rear terminal 6 S32RR Seat Heating Switch - Right Rear terminal 6

S48B Multifunction Switch - Overhead Console terminal 18 S48E Multifunction Switch - Center Console terminal 3

If the test lamp illuminates at FULL intensity

1. Vehicle OFF, disconnect the X1 harness connector at the K9 Body Control Module, vehicle in Service Mode.

2. Test for less than 1 V between the control circuit terminal 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 does not illuminate at FULL intensity

4. Test or replace the component with the inoperative switch indicator.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair. Refer to Interior Lamp and Multifunction Switch Replacement

Refer to Headlamp Switch Replacement

Refer to Control Module References for BCM replacement, programming, and setup

DTC B3596: HAZARD LAMPS REQUEST CIRCUIT 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.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptor

DTC B3596 00

Hazard Lamps Request Circuit Malfunction

Diagnostic Fault Information

Circuit/System Description

The hazard flashers may be activated in any power mode. The hazard warning switch signal circuit is momentarily grounded when the hazard warning switch is pressed. The body control module (BCM) responds to the hazard warning switch signal input by supplying battery voltage to all four turn signal lamps in an ON and OFF duty cycle. When the hazard warning switch is activated, the BCM sends a serial data message to the instrument cluster requesting both turn signal indicators to be cycled ON and OFF.

Conditions for Running the DTC

Battery voltage must be between 9-16 V. Hazard lamps ON.

Conditions for Setting the DTC

The hazard warning switch input is Active for longer than 60 s.

Actions Taken When the DTC Sets The hazard lamps are inoperative. Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists.

A history DTC will clear once 100 consecutive malfunction-free vehicle ON/OFF switch cycles have occurred.

Reference Information

Schematic Reference

Exterior Lights Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Exterior Lighting Systems 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, scan tool disconnected, all doors closed, all accessories OFF, disconnect the harness connector at the S26 Hazard Warning Switch. It may take up to 2 min for all vehicle systems to power down.

2. Test for less than 5 Ω between the ground circuit terminal 1 and ground.

If 5 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 5 Ω

3. Vehicle in Service Mode.

4. Verify the scan tool Hazard Lamps Switch parameter is Inactive.

If not Inactive

1. Vehicle OFF, disconnect the X2 harness connector at the K9 Body Control Module.

2. 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 K9 Body Control Module.

If Inactive

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

6. Verify the scan tool Hazard Lamps Switch parameter is Active.

If not Active

1. Vehicle OFF, disconnect the X2 harness connector at the K9 Body Control Module, vehicle in Service Mode.

2. Test for less than 1 V between the signal circuit terminal 3 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 Active

7. Test or replace the S26 Hazard Warning Switch.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Hazard Warning Switch Replacement

Refer to Control Module References for BCM replacement, programming, and setup

DTC B3600: PASSENGER COMPARTMENT DIMMING REQUEST SIGNAL 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.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptors

DTC B3600 03

Passenger Compartment Dimming Request Signal Circuit Low Voltage

DTC B3600 07

Passenger Compartment Dimming Request Signal Circuit High Voltage

Diagnostic Fault Information

Circuit/System Description

The instrument panel dimmer switch is used to increase and decrease the brightness of the interior backlighting components. The instrument panel dimmer switch provides a voltage signal to the body control module (BCM) that will increase as the brightness of the lights are increased and decrease as the brightness of the lights are decreased. The BCM provides B+, low reference, and signal circuits to the instrument panel dimmer switch.

When the instrument panel dimmer switch is placed in the desired position, the dimmed voltage setting is applied from the instrument panel dimmer switch through the instrument panel dimmer switch signal circuit to the BCM. The BCM interprets the signal and applies a pulse width modulated (PWM) voltage through the LED dimming control circuits illuminating the interior backlighting to the requested level of brightness.

Conditions for Running the DTC

Battery voltage must be between 9 - 16 V. Park lamps ON.

Conditions for Setting the DTC

DTC B3600 03

The BCM detects a short to ground or an open/high resistance in the instrument panel dimmer switch B+ reference circuit.

The BCM detects a short to ground or an open/high resistance in the instrument panel dimmer switch signal circuit.

DTC B3600 07

The BCM detects a short to voltage in the instrument panel dimmer switch B+ reference circuit. The BCM detects a short to voltage in the instrument panel dimmer switch signal circuit.

Actions Taken When the DTC Sets

All interior backlighting defaults to FULL bright.

Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists.

A history DTC will clear once 100 consecutive malfunction-free vehicle ON/OFF switch cycles have occurred.

Reference Information

Schematic Reference

Interior Lights Dimming Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Interior Lighting Systems 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 and all vehicle systems OFF, disconnect the harness connector at the S30 Headlamp Switch, vehicle in Service Mode.

2. Test for B+ between the B+ circuit terminal 12 and ground.

If less than B+

1. Vehicle OFF, disconnect the X1 harness connector at the K9 Body Control Module, vehicle in

Service Mode.

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

3. 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, replace the K9 Body Control Module.

If B+

3. Test for B+ between the B+ circuit terminal 12 and the low reference circuit terminal 7.

If less than B+

1. Vehicle OFF, disconnect the X1 harness connector at the K9 Body Control Module, vehicle in Service Mode.

2. Test for less than 1 V between the low reference circuit terminal 7 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 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 B+

4. Verify a test lamp does not illuminate between the B+ circuit terminal 12 and the signal circuit terminal 11.

If the test lamp illuminates

1. Vehicle OFF, disconnect the X2 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, replace the K9 Body Control Module.

If the test lamp does not illuminate

5. Test for B+ between the B+ circuit terminal 12 and the signal circuit terminal 11.

If less than B+

1. Vehicle OFF, disconnect the X2 harness connector at the K9 Body Control Module, vehicle in Service Mode.

2. 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

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 B+

6. Test or replace the S30 Headlamp Switch.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Headlamp Switch Replacement

Refer to Control Module References for BCM replacement, programming and setup

DTC B3650: HIGH BEAM REQUEST SIGNAL CIRCUIT PERFORMANCE - SIGNAL INVALID

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.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptor

DTC B3650 08

High Beam Request Signal Circuit Performance - Signal Invalid

Diagnostic Fault Information

Circuit/System Description

For headlamp operation, the body control module (BCM) monitors three signal circuits from the turn signal/multifunction switch. When the turn signal/multifunction switch is in the AUTO position, the three signal circuits are open and the BCM relies on the ambient light sensor input to turn the headlamps and daytime running lamps (DRLs) ON and OFF. When the turn signal/multifunction switch is placed in the OFF position, the turn signal/multifunction switch headlamps OFF signal circuit is grounded, indicating to the BCM that the exterior lamps should be turned OFF. With the turn signal/multifunction switch in the PARK LAMPS position, the turn signal/multifunction switch park lamps ON signal circuit is grounded, indicating that the park lamps have been requested. When the turn signal/multifunction switch is in the HEADLAMP position, both the turn signal/multifunction switch park lamps ON signal circuit and the turn signal/multifunction switch headlamps ON signal circuit are grounded. The BCM responds by commanding the park lamps and headlamps ON.

Conditions for Running the DTC

Battery voltage must be between 9-16 V.

Conditions for Setting the DTC

The BCM detects a short to ground in the turn signal/multifunction switch high beam signal circuit.

Actions Taken When the DTC Sets

The high beam headlamps will not operate.

Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists.

A history DTC will clear once 100 consecutive malfunction-free vehicle ON/OFF switch cycles have occurred.

Reference Information

Schematic Reference

Headlights/Daytime Running Lights (DRL) Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Exterior Lighting Systems 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, scan tool disconnected, all doors closed, all accessories OFF, disconnect the harness connector at the S78 Turn Signal/Multifunction Switch. It may take up to 2 min for all vehicle systems to power down.

2. Test for less than 5 Ω between the ground circuit terminal 3 and ground.

If 5 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 5 Ω

3. Vehicle in Service Mode.

4. Verify the scan tool High Beam Select Switch parameter is Inactive.

If not Inactive

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

2. Test for infinite resistance between the signal circuit terminal 7 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 Inactive

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

6. Verify the scan tool High Beam Select Switch parameter is Active.

If not Active

1. Vehicle OFF, disconnect the X3 harness connector at the K9 Body Control Module, vehicle in Service Mode.

2. Test for less than 1 V between the signal circuit terminal 7 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 Active

7. Test or replace the S78 Turn Signal/Multifunction Switch.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Turn Signal Switch Replacement

Refer to Control Module References for BCM replacement, programming, and setup

DTC B3806: HIGH BEAM AND HEADLAMP FLASH SELECT CIRCUIT 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.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptor

DTC B3806 00

High Beam and Headlamp Flash Select Circuit Malfunction

Diagnostic Fault Information

Circuit/System Description

When the turn signal/multifunction switch is momentarily placed in the flash to pass position, ground is applied to the body control module (BCM) through the flash to pass signal circuit. The BCM responds to the flash to pass request by applying ground to the high beam relay control circuit which energizes the high beam relay.

With the high beam relay energized, the switch contacts close allowing battery voltage to flow through the high beam fuses to the high beam control circuits illuminating the high beam headlamps. The high beam headlamps will only illuminate for as long at the flash to pass switch is activated.

Conditions for Running the DTC

Battery voltage must be between 9-16 V.

Conditions for Setting the DTC

The BCM detects a short to ground in the turn signal/multifunction switch flash to pass signal circuit.

Actions Taken When the DTC Sets

The high beam lamps and the high beam indicator on the instrument panel cluster are always ON.

Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists.

A history DTC will clear once 100 consecutive malfunction-free vehicle ON/OFF switch cycles have occurred.

Reference Information

Schematic Reference

Headlights/Daytime Running Lights (DRL) Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Exterior Lighting Systems 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, scan tool disconnected, all doors closed, all accessories OFF, disconnect the harness connector at the S78 Turn Signal/Multifunction Switch. It may take up to 2 min for all vehicle systems to power down.

2. Test for less than 5 Ω between the ground circuit terminal 3 and ground.

If 5 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 5 Ω

3. Vehicle in Service Mode.

4. Verify the scan tool Headlamps Flash Switch parameter is Inactive.

If not Inactive

1. Vehicle OFF, disconnect the X3 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 Inactive

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

6. Verify the scan tool Headlamps Flash Switch parameter is Active.

If not Active

1. Vehicle OFF, disconnect the X3 harness connector at the K9 Body Control Module, vehicle in Service Mode.

2. Test for less than 1 V between the signal circuit terminal 6 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 Active

7. Test or replace the S78 Turn Signal/Multifunction Switch.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Turn Signal Switch Replacement

Refer to Control Module References for BCM replacement, programming, and setup

DTC B3881 OR B3882: LEFT TAIL LAMP CIRCUIT/RIGHT TAIL LAMP 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.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptors

DTC B3881 01

Left Tail Lamp Circuit Short to Battery

DTC B3881 02

Left Tail Lamp Circuit Short to Ground

DTC B3881 04

Left Tail Lamp Circuit Open

DTC B3882 01

Right Tail Lamp Circuit Short to Battery

DTC B3882 02

Right Tail Lamp Circuit Short to Ground

DTC B3882 04

Right Tail Lamp Circuit Open

Diagnostic Fault Information

Circuit/System Description

The brake pedal position (BPP) sensor is used to sense the action of the driver application of the brake pedal. The BPP sensor provides an analog voltage signal that will increase as the brake pedal is applied. The body control module (BCM) provides a low reference signal and a 5-volt reference voltage to the BPP sensor. When the variable signal reaches a voltage threshold indicating the brakes have been applied, the BCM will apply battery voltage to the left and right stop lamp control circuits illuminating the left and right stop lamps.

Conditions for Running the DTC

Battery voltage must be between 9-16 V. Stop lamps ON.

Conditions for Setting the DTC

DTC B3881 01 and B3881 04

The BCM detects a short to voltage or an open/high resistance in the left rear stop lamp control circuit.

DTC B3881 02

The BCM detects a short to ground in the left rear stop lamp control circuit.

DTC B3882 01 and B3882 04

The BCM detects a short to voltage or an open/high resistance in the right rear stop lamp control circuit.

DTC B3882 02

The BCM detects a short to ground in the right rear stop lamp control circuit.

Actions Taken When the DTC Sets

DTC B3881 01

The left rear stop lamp is always ON.

DTC B3881 02 and B3881 04

The left rear stop lamp is inoperative.

DTC B3882 01

The right rear stop lamp is always ON.

DTC B3882 02 and B3882 04

The right rear stop lamp is inoperative.

Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists.

A history DTC will clear once 100 consecutive malfunction-free vehicle ON/OFF switch cycles have occurred.

Reference Information

Schematic Reference

Exterior Lights Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Exterior Lighting Systems 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, exterior lamps OFF, trunk latch latched, disconnect the harness connector at the appropriate E5 Stop Lamp.

2. Test for less than 5 Ω between the ground circuit terminal B and ground.

If 5 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 5 Ω

3. Connect a test lamp between the control circuit terminal A and ground, vehicle in Service Mode.

4. Verify the test lamp turns ON and OFF when commanding the appropriate Rear Park Lamp ON and OFF with a scan tool.

If the test lamp is always OFF

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

X4 - left stop lamp X5 - right stop lamp

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, disconnect the appropriate harness connector listed below at the K9 Body Control Module, vehicle in Service Mode.

X4 - left stop lamp X5 - right stop lamp

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

5. Test or replace the appropriate E5 Stop Lamp.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Stop and Tail Lamp Bulb Replacement

Refer to Control Module References for BCM replacement, programming, and setup

DTC B3883: LICENSE PLATE LAMP 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.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptors

DTC B3883 01

License Plate Lamp Circuit Short to Battery

DTC B3883 02

License Plate Lamp Circuit Short to Ground

DTC B3883 04

License Plate Lamp Circuit Open

Diagnostic Fault Information

Circuit/System Description

When the turn signal/multifunction switch is placed in the HEAD or PARK position, ground is applied to the park lamp switch ON signal circuit to the body control module (BCM). The BCM responds by applying voltage to the park lamps and license lamps control circuits illuminating the park and license lamps.

Conditions for Running the DTC

DTC B3883 01

Turn signal/multifunction switch in OFF position.

DTC B3883 02 and B3883 04

Turn signal/multifunction switch in AUTO, PARK or ON positions.

Conditions for Setting the DTC

DTC B3883 01

The BCM detects a short to voltage in the license plate lamp control circuit.

DTC B3883 02

The BCM detects a short to ground in the license plate lamp control circuit.

DTC B3883 04

The BCM detects an open/high resistance in the license plate lamp control circuit.

Actions Taken When the DTC Sets

DTC B3883 01

License plate lamps always ON.

DTC B3883 02 and B3883 04

License plate lamps inoperative.

Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists.

A history DTC will clear once 100 consecutive malfunction-free vehicle ON/OFF switch cycles have occurred.

Reference Information

Schematic Reference

Exterior Lights Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Exterior Lighting Systems 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, exterior lamps OFF, remove both E7 License Plate Lamp bulbs.

2. Test for less than 5 Ω between each ground circuit terminal 2 and ground.

If 5 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 5 Ω

3. Connect a test lamp between the E7L License Plate Lamp - Left control circuit terminal 1 and ground, vehicle in Service Mode.

4. Verify the test lamp turns ON and OFF when commanding the License Plate Lamps ON and OFF with a scan tool.

If the test lamp is always OFF

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

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

5. Vehicle OFF.

6. Connect a test lamp between the E7R License Plate Lamp - Right control circuit terminal 1 and ground, vehicle in Service Mode.

7. Verify the test lamp turns ON and OFF when commanding the License Plate Lamps ON and OFF with a scan tool.

If the test lamp is always OFF

1. Vehicle OFF, disconnect the X4 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 the test lamp turns ON and OFF

8. Test or replace the E7 License Plate Lamp bulb.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Rear License Plate Lamp Replacement

Refer to Control Module References for BCM replacement, programming, and setup

DTC B3884: CENTER HIGH MOUNTED STOP LAMP 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.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptors

DTC B3884 01

Center High Mounted Stop Lamp Circuit Short to Battery

DTC B3884 02

Center High Mounted Stop Lamp Circuit Short to Ground

DTC B3884 04

Center High Mounted Stop Lamp Circuit Open

Diagnostic Fault Information

Circuit/System Description

The brake pedal position sensor is used to sense the action of the driver application of the brake pedal. The brake pedal position sensor provides an analog voltage signal that will increase as the brake pedal is applied. The body control module (BCM) provides a low reference signal and a 5 V reference voltage to the brake pedal position sensor. When the variable signal reaches a voltage threshold indicating the brakes have been applied, the BCM will apply battery voltage to the left and right stop lamp control circuits as well as the center high mounted stop lamp control circuit illuminating the left and right stop lamps and the center high mounted stop lamp.

Conditions for Running the DTC

Battery voltage must be between 9-16 V. Brakes APPLIED.

Conditions for Setting the DTC

DTC B3884 01

The BCM detects a short to voltage in the center high mounted stop lamp control circuit.

DTC B3884 02

The BCM detects a short to ground in the center high mounted stop lamp control circuit.

DTC B3884 04

The BCM detects an open/high resistance in the center high mounted stop lamp control circuit.

Actions Taken When the DTC Sets

DTC B3884 01

Center high mounted stop lamp always ON.

DTC B3884 02 and B3884 04

Center high mounted stop lamp inoperative.

Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists.

A history DTC will clear once 100 consecutive malfunction-free vehicle ON/OFF switch cycles have occurred.

Reference Information

Schematic Reference

Exterior Lights Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Exterior Lights Schematics

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, exterior lamps OFF, disconnect the harness connector at the E6 Center High Mounted Stop Lamp.

2. Test for less than 5 Ω between the ground circuit terminal 2 and ground.

If 5 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 5 Ω

3. Connect a test lamp between the control circuit terminal 1 and ground, vehicle in Service Mode.

4. Verify the test lamp turns ON and OFF when commanding the Center Stop Lamp ON and OFF with a scan tool.

If the test lamp is always OFF

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

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

5. Test or replace the E6 Center High Mounted Stop Lamp.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to High Mount Stop Lamp Replacement

Refer to Control Module References for BCM replacement, programming, and setup

DTC B3948 OR B3949: LEFT FRONT TURN SIGNAL CIRCUIT/RIGHT FRONT TURN SIGNAL 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.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptors

DTC B3948 01

Left Front Turn Signal Circuit Short to Battery

DTC B3948 02

Left Front Turn Signal Circuit Short to Ground

DTC B3948 04

Left Front Turn Signal Circuit Open

DTC B3949 01

Right Front Turn Signal Circuit Short to Battery

DTC B3949 02

Right Front Turn Signal Circuit Short to Ground

DTC B3949 04

Right Front Turn Signal Circuit Open

Diagnostic Fault Information

Circuit/System Description

Ground is applied at all times to the turn signal/multifunction switch. The turn signal lamps may only be

activated with the vehicle ON/OFF switch in the SERVICE MODE or ON positions. When the turn signal/multifunction switch is placed in either the turn right or turn left position, ground is applied to the body control module (BCM) through either the right turn or left turn signal switch signal circuit. The BCM responds to the turn signal switch input by applying a pulsating voltage to the front and rear turn signal lamps through their respective control circuits. When a turn signal request is received by the BCM, a serial data message is sent to the instrument panel requesting the respective turn signal indicator be pulsed ON and OFF.

Conditions for Running the DTC

Battery voltage must be between 9-16 V.

Conditions for Setting the DTC

DTC B3948 01 and B3948 04

The BCM detects a short to ground or an open/high resistance in the F18DA (BCM 7) fuse B+ circuit. The BCM detects an open/high resistance in the left front turn signal control circuit.

The BCM detects an open/high resistance in the left front turn signal ground circuit.

DTC B3948 02

The BCM detects a short to ground in the left front turn signal control circuit.

DTC B3949 01 and B3949 04

The BCM detects a short to ground or an open/high resistance in the F8DA (BCM 3) fuse B+ circuit. The BCM detects an open/high resistance in the right front turn signal control circuit.

The BCM detects an open/high resistance in the right front turn signal ground circuit.

DTC B3949 02

The BCM detects a short to ground in the right front turn signal control circuit.

Actions Taken When the DTC Sets

DTC B3948

The left front turn signal is inoperative.

The left turn signal indicator on the instrument cluster flashes rapidly.

The driver information center displays "Left Front Turn Indicator Failure".

DTC B3949

The right front turn signal is inoperative.

The right turn signal indicator on the instrument cluster flashes rapidly.

The driver information center displays "Right Front Turn Indicator Failure".

Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists.

A history DTC will clear once 100 consecutive malfunction-free vehicle ON/OFF switch cycles have occurred.

Reference Information

Schematic Reference

Exterior Lights Schematics

Body Control System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Exterior Lighting Systems 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

DTC B3948

1. Vehicle OFF, disconnect the X5 harness connector at the K9 Body Control Module, vehicle in Service Mode.

2. Verify a test lamp illuminates between the B+ 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 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 K9 Body Control Module.

If the test lamp illuminates

3. Vehicle OFF, connect the X5 harness connector at the K9 Body Control Module.

4. Exterior lamps OFF, disconnect the harness connectors at the E4LF Turn Signal Lamp - Left Front.

5. Test for less than 10 Ω between the ground circuit at the socket 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

6. Connect a test lamp between the control circuit at the socket terminal and ground, vehicle in Service Mode.

7. Verify the test lamp turns ON and OFF when commanding the Left Front Turn Signal Lamp ON and OFF with a scan tool.

If the test lamp is always OFF

1. Vehicle OFF, disconnect the X5 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, disconnect the X5 harness connector at the K9 Body Control Module, vehicle in Service Mode.

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

8. Test or replace the E4LF Turn Signal Lamp - Left Front.

DTC B3949

1. Vehicle OFF, disconnect the X1 harness connector at the K9 Body Control Module, vehicle in Service Mode.

2. Verify a test lamp illuminates between the B+ 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 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 K9 Body Control Module.

If the test lamp illuminates

3. Vehicle OFF, connect the X1 harness connector at the K9 Body Control Module.

4. Exterior lamps OFF, disconnect the harness connector at the component E4RF Turn Signal Lamp - Right Front.

5. Test for less than 10 Ω between the ground circuit at the socket 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

6. Connect a test lamp between the control circuit at the socket terminal and ground, vehicle in Service Mode.

7. Verify the test lamp turns ON and OFF when commanding the Right Front Turn Signal Lamp ON and OFF with a scan tool.

If the test lamp is always OFF

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

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

8. Test or replace the E4RF Turn Signal Lamp - Right Front.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Front Turn Signal Lamp Bulb Replacement

Refer to Control Module References for BCM replacement, programming and setup

DTC B3950 OR B3951: LEFT REAR TURN SIGNAL CIRCUIT/RIGHT REAR TURN SIGNAL 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.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptors

DTC B3950 01

Left Rear Turn Signal Circuit Short to Battery

DTC B3950 02

Left Rear Turn Signal Circuit Short to Ground

DTC B3950 04

Left Rear Turn Signal Circuit Open

DTC B3951 01

Right Rear Turn Signal Circuit Short to Battery

DTC B3951 02

Right Rear Turn Signal Circuit Short to Ground

DTC B3951 04

Right Rear Turn Signal Circuit Open

Diagnostic Fault Information

Circuit/System Description

Ground is applied at all times to the turn signal/multifunction switch. The turn signal lamps may only be activated with the vehicle ON/OFF switch in the SERVICE MODE or ON positions. When the turn signal/multifunction switch is placed in either the turn right or turn left position, ground is applied to the body control module (BCM) through either the right turn or left turn signal switch signal circuit. The BCM responds to the turn signal switch input by applying a pulsating voltage to the front and rear turn signal lamps through their respective control circuits. When a turn signal request is received by the BCM, a serial data message is sent to the instrument panel requesting the respective turn signal indicator be pulsed ON and OFF.

Conditions for Running the DTC

Battery voltage must be between 9-16 V.

Conditions for Setting the DTC

DTC B3950 01 and B3950 04

The BCM detects a short to ground or an open/high resistance in the F21DA (BCM 4) fuse B+ circuit. The BCM detects an open/high resistance in the left rear turn signal control circuit.

The BCM detects an open/high resistance in the left rear turn signal ground circuit.

DTC B3950 02

The BCM detects a short to ground in the left rear turn signal control circuit.

DTC B3951 01 and B3951 04

The BCM detects a short to ground or an open/high resistance in the F18DA (BCM 7) fuse B+ circuit. The BCM detects an open/high resistance in the right rear turn signal control circuit.

The BCM detects an open/high resistance in the right rear turn signal ground circuit.

DTC B3951 02

The BCM detects a short to ground in the right rear turn signal control circuit.

Actions Taken When the DTC Sets

DTC B3950

The left rear turn signal is inoperative.

The left turn signal indicator on the instrument cluster flashes rapidly.

The driver information center displays "Left Rear Turn Indicator Failure".

DTC B3951

The right rear turn signal is inoperative.

The right turn signal indicator on the instrument cluster flashes rapidly.

The driver information center displays "Right Rear Turn Indicator Failure".

Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists.

A history DTC will clear once 100 consecutive malfunction-free vehicle ON/OFF switch cycles have occurred.

Reference Information

Schematic Reference

Exterior Lights Schematics

Body Control System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Exterior Lighting Systems 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

DTC B3950

1. Vehicle OFF, disconnect the X1 harness connector at the K9 Body Control Module, vehicle in Service Mode.

2. Verify a test lamp illuminates between the B+ circuit terminal 2 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 K9 Body Control Module.

If the test lamp illuminates

3. Vehicle OFF, connect the X1 harness connector at the K9 Body Control Module.

4. Exterior lamps OFF, disconnect the harness connector at the E4LR Turn Signal Lamp - Left Rear.

5. Test for less than 5 Ω between the ground circuit at the socket terminal and ground.

If 5 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 5 Ω

6. Connect a test lamp between the control circuit at the socket terminal and ground, vehicle in Service Mode.

7. Verify the test lamp turns ON and OFF when commanding the Left Rear Turn Signal/Brake Lamp ON and OFF with a scan tool.

If the test lamp is always OFF

1. Vehicle OFF, disconnect the X5 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, disconnect the X5 harness connector at the K9 Body Control Module, vehicle in Service Mode.

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

8. Test or replace the E4LR Turn Signal Lamp - Left Rear.

DTC B3951

1. Vehicle OFF, disconnect the X5 harness connector at the K9 Body Control Module, vehicle in Service Mode.

2. Verify a test lamp illuminates between the B+ 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 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 K9 Body Control Module.

If the test lamp illuminates

3. Vehicle OFF, connect the X5 harness connector at the K9 Body Control Module.

4. Exterior lamps OFF, disconnect the harness connector at the E4RR Turn Signal Lamp - Right Rear.

5. Test for less than 5 Ω between the ground circuit at the socket terminal and ground.

If 5 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 5 Ω

6. Connect a test lamp between the control circuit at the socket terminal and ground, vehicle in Service Mode.

7. Verify the test lamp turns ON and OFF when commanding the Right Rear Turn Signal/Brake Lamp ON and OFF with a scan tool.

If the test lamp is always OFF

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

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

8. Test or replace the E4RR Turn Signal Lamp - Right Rear.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Stop and Tail Lamp Bulb Replacement

Refer to Control Module References for BCM replacement, programming and setup

DTC C0277 OR C0890: BRAKE PEDAL POSITION SENSOR CIRCUIT/CONTROL MODULE VOLTAGE REFERENCE OUTPUT 3 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.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptors

DTC C0277 06

Brake Pedal Position Sensor Circuit Low Voltage/Open

DTC C0277 07

Brake Pedal Position Sensor Circuit High Voltage

DTC C0277 09

Brake Pedal Position Sensor Circuit Too Fast Transitions

DTC C0277 4B

Brake Pedal Position Sensor Circuit Calibration Not Learned

DTC C0890 03

Control Module Voltage Reference Output 3 Circuit Low Voltage

DTC C0890 07

Control Module Voltage Reference Output 3 Circuit High Voltage

Diagnostic Fault Information

Circuit/System Description

The brake pedal position (BPP) sensor is used to sense the action of the driver application of the brake pedal. The BPP sensor provides an analog voltage signal that will increase as the brake pedal is applied. The body control module (BCM) provides a low reference signal and a 5-volt reference voltage to the BPP sensor. When the variable signal reaches a voltage threshold indicating the brakes have been applied, the BCM will apply battery voltage to the left and right stop lamp control circuits as well as the center high mounted stop lamp (CHMSL) control circuit illuminating the left and right stop lamps and the CHMSL.

Conditions for Running the DTC

Battery voltage must be between 9 - 16 V. Brakes APPLIED.

Conditions for Setting the DTC

DTC C0277 06

The BCM detects a short to ground or an open/high resistance in the BPP sensor 5 V reference circuit. The BCM detects a short to ground or an open/high resistance in the BPP sensor signal circuit.

DTC C0277 07

The BCM detects a short to voltage in the BPP sensor 5 V reference circuit. The BCM detects a short to voltage in the BPP sensor signal circuit.

DTC C0277 09

The BCM detects the BPP sensor signal is changing faster than possible under normal operating conditions.

DTC C0277 4B

The DTC will set when the BPP sensor home position is not learned.

DTC C0890 03

The BCM detects a short to ground or an open/high resistance in the BPP sensor 5 V reference circuit.

DTC C0890 07

The BCM detects a short to voltage in the BPP sensor 5 V reference circuit. The BCM detects a short to voltage in the BPP sensor signal circuit.

Actions Taken When the DTC Sets

DTC C0277 06 and C0890 03

The vehicle will not start with a short to ground or an open/high resistance on the BPPS 5 V reference circuit or the BPPS signal circuit.

DTC C0277 07 and C0890 07

The vehicle will not start with a short to voltage on the BPPS 5 V reference circuit or the BPPS signal circuit.

Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists.

For DTC C0277 4B a successful brake pedal position sensor calibration has been performed.

A history DTC will clear once 50 consecutive malfunction-free vehicle ON/OFF switch cycles have occurred.

A DTC will not clear the current status until the next ignition cycle.

Reference Information

Schematic Reference

Exterior Lights Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Exterior Lighting Systems 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

DTC C0277 06, C0277 07, C0890 03, and C0890 07

1. Vehicle OFF, disconnect the harness connector at the B22 Brake Pedal Position Sensor, vehicle in Service Mode.

2. 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 X2 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 X2 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

3. Verify the scan tool Brake Pedal Applied parameter is Inactive.

If not Inactive

1. Vehicle OFF, disconnect the X2 harness connector at the K9 Body Control Module, vehicle in Service Mode.

2. Test for less than 1 V between the signal circuit terminal 3 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 Inactive

4. Install a 3 A fused jumper wire between the 5-volt reference circuit terminal 1 and the signal circuit terminal 3.

5. Verify the scan tool Brake Pedal Applied parameter is Active.

If not Active

1. Vehicle OFF, disconnect the X2 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 Active

6. Test or replace the B22 Brake Pedal Position Sensor.

DTC C0277 4B

1. Verify DTC C0277 4B is not set.

If DTC C0277 4B is set

1. Vehicle in Service Mode.

2. Perform the BPP sensor recalibration procedure for the K9 Body Control Module. Refer to Brake Pedal Position Sensor Calibration.

3. Verify the DTC does not reset while operating the vehicle under the conditions for running the DTC.

If the DTC resets, replace the B22 Brake Pedal Position Sensor. If the DTC does not reset

4. All OK.

If DTC C0277 4B is not set

2. All OK.

DTC C0277 09

1. Verify DTC C0277 09 is not set.

If DTC C0277 09 is set

1. Replace the B22 Brake Pedal Position Sensor.

2. Perform the BPP sensor recalibration procedure for the K9 Body Control Module. Refer to Brake Pedal Position Sensor Calibration.

3. Verify the DTC does not reset while operating the vehicle under the conditions for running the DTC.

If the DTC resets, replace the K9 Body Control Module. If the DTC does not reset

4. All OK.

If DTC C0277 09 is not set

2. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Brake Pedal Position Sensor Calibration

Refer to Brake Pedal Position Sensor Replacement

Refer to Control Module References for BCM replacement, programming, and setup

DTC C0297: BRAKE APPLIED OUTPUT 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.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptor

DTC C0297 02

Brake Applied Output Circuit Short to Ground

Diagnostic Fault Information

Circuit/System Description

The brake pedal position sensor is used to sense the action of the driver application of the brake pedal. The brake pedal position sensor provides an analog voltage signal that will increase as the brake pedal is applied. The body control module (BCM) provides a low reference signal and a 5 V reference voltage to the brake pedal position sensor. When the variable signal reaches a voltage threshold indicating the brakes have been applied, the BCM will apply battery voltage to the right and left stop lamp control circuits, engine control module (ECM), and center high mounted stop lamp control circuit.

Conditions for Running the DTC

Battery voltage must be between 9 - 16 V. Brakes APPLIED.

Conditions for Setting the DTC

The BCM detects a short to ground or an open/high resistance on the brake applied signal circuit.

Actions Taken When the DTC Sets

The cruise control system is disabled.

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 switch cycles have occurred.

Diagnostic Aids

Verify that the brake pedal position sensor is properly calibrated.

Reference Information

Schematic Reference

Exterior Lights Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Exterior Lighting Systems 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 X1 harness connector at the K20 Engine Control Module.

2. Connect a test lamp between the signal circuit terminal 50 and ground, vehicle in Service Mode.

3. Verify the test lamp turns ON and OFF while pressing and releasing the brake pedal.

If the test lamp is always OFF

1. Vehicle OFF, disconnect the X5 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 the test lamp is always ON

1. Vehicle OFF, disconnect the X5 harness connector at the K9 Body Control Module, vehicle in Service Mode.

2. Test for less than 1 V between the signal circuit terminal 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. Replace the K20 Engine Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Brake Pedal Position Sensor Calibration

Refer to Control Module References for BCM or ECM replacement, programming, and setup

SYMPTOMS - LIGHTING

NOTE: The following steps must be completed before using a symptom table.

Perform the Diagnostic System Check - Vehicle before using a symptom table in order to verify that all of the following conditions are true:

There are no DTCs set.

The control modules can communicate via the serial data link.

Review the system description and operation in order to familiarize yourself with the system functions.

Refer to the following:

Exterior Lighting Systems Description and Operation Interior Lighting Systems Description and Operation

Visual/Physical Inspection

Inspect for aftermarket devices which could affect the operation of the lighting 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

Thoroughly inspect the wiring and connectors. An incomplete inspection of the wiring and connectors may result in misdiagnosis causing part replacement with the reappearance of the malfunction. If an intermittent malfunction exists, 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:

Backup Lamps Malfunction Courtesy Lamps Malfunction

Daytime Running Lamps Malfunction Dome Lamps Malfunction

Hazard Lamps Malfunction Headlamps Malfunction

Interior Accent Lighting Malfunction Interior Backlighting Malfunction

Park, License, and/or Tail Lamps Malfunction Rear Compartment Lamp Malfunction

Stop Lamps Malfunction

Turn Signal Lamps and/or Indicators Malfunction

BACKUP LAMPS 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.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

Diagnostic Fault Information

Circuit/System Description

With the vehicle ON and the transmission in the reverse position, the transmission control module (TCM) sends a serial data message to the body control module (BCM). The message indicates that the gear selector is in the reverse position. The BCM applies battery voltage to the backup lamp control circuit illuminating the backup lamp. Once the driver moves the gear selector out of the reverse position, a message is sent by the TCM via serial data requesting the BCM to remove battery voltage from the backup lamp control circuit. The vehicle must be ON for the backup lamps to operate.

Reference Information

Schematic Reference

Exterior Lights Schematics

Body Control System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Exterior Lighting Systems 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 X5 harness connector at the K9 Body Control Module, vehicle in Service Mode.

2. Verify a test lamp illuminates between the B+ 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 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 K9 Body Control Module.

If the test lamp illuminates

3. Vehicle OFF, connect the X5 harness connector at the K9 Body Control Module.

4. Vehicle OFF, exterior lamps OFF, disconnect the harness connector at the E5 Backup Lamp.

5. Test for less than 5 Ω between the ground circuit at the socket terminal and ground.

If 5 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 5 Ω

6. Connect a test lamp between the control circuit at the socket terminal and ground, vehicle in Service Mode.

7. Verify the test lamp turns ON and OFF when commanding the Backup Lamps ON and OFF with a scan tool.

If the test lamp is always OFF

1. Vehicle OFF, disconnect the X7 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, disconnect the X7 harness connector at the K9 Body Control Module, vehicle in Service Mode.

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

8. Test or replace the E5 Backup Lamp.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Backup Lamp Bulb Replacement

Refer to Control Module References for BCM replacement, programming, and setup

COURTESY LAMPS 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.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

Diagnostic Fault Information

Circuit/System Description

The body control module (BCM) supplies battery voltage to the front reading lamps and left and right sunshade lamps via the courtesy lamp control circuit. When a sunshade mirror is opened, the switch contact close allowing battery voltage to flow illuminating the respective lamps. The front reading lamps are controlled by individual switches that are activated by the operator when additional cabin lighting is required. In the event that any of these courtesy lamps were to remain illuminated for more than 10 min with the vehicle ON/OFF switch in the OFF position and no doors opened, the BCM will deactivate the courtesy lamp control circuit to prevent total battery discharge.

Diagnostic Aids

When the F22DA (BCM 6) fuse is open, both dome lamps, sunshade lamps, reading lamps, and backup lamps will be inoperative.

Reference Information

Schematic Reference

Interior Lights Dimming Schematics Body Control System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Interior Lighting Systems Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs