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Contents Wiring diagrams Section: Exterior Lights All sections

Lighting System Buick Enclave I

Exterior Lights 75 illustrations ~28585 words

Fastener Tightening Specifications

ApplicationSpecification
MetricEnglish
Back Up Lamp Applique Nuts- Acadia5 N.m44 lb in
Back Up Lamp Applique Nuts- Enclave6 N.m53 lb in
Back Up Lamp Bracket Screw- Acadia2 N.m18 lb in
Back Up Lamp Bracket Screw- Traverse6 N.m53 lb in
Back Up Lamp Screws2 N.m18 lb in
Dome Lamp Housing Screws2 N.m18 lb in
DRL Lamp Assembly Screws2 N.m18 lb in
Front Bumper Fender Brace to Headlamp Assembly Screws2 N.m18 lb in
Front Fog Lamp Bracket Screw2.5 N.m22 lb in
Front Turn Signal Lamp Assembly Nuts9 N.m80 lb in
Headlamp Assembly Screws6 N.m53 lb in
Headlamp Capsule Ballast Screws3 N.m27 lb in
Headlamp Vertical Adjusting Nut6 N.m53 lb in
High Mounted Stop Lamp to Rear Spoiler Screws2 N.m18 lb in
License Lamp Screws2 N.m18 lb in
Parking and Front Fog Lamp Bracket Screws2.5 N.m22 lb in
Park and Turn Signal Lamp Screw2.5 N.m22 lb in
Sunroof DVD Lamp Housing Screws2 N.m18 lb in
Tail Lamp Assembly Screws3 N.m27 lb in
Tail Lamp Screw2.5 N.m22 lb in

Fastener Tightening Specifications

Scheme 1

Scheme 1: Low Beams
Scheme 1: Low Beams

Scheme 2

Scheme 2: High Beams (Except TSH or T26)
Scheme 2: High Beams (Except TSH or T26)

Scheme 3

Scheme 3: High Beams (TSH or T26)
Scheme 3: High Beams (TSH or T26)

Scheme 4

Scheme 4: Daytime Running Lights
Scheme 4: Daytime Running Lights

Scheme 5

Scheme 5: Adaptive Forward Lighting System (TSH or T26)
Scheme 5: Adaptive Forward Lighting System (TSH or T26)

Scheme 6

Scheme 6: Front Fog Lamps (T96)
Scheme 6: Front Fog Lamps (T96)

Scheme 7

Scheme 7: Rear Fog Lamp (T79)
Scheme 7: Rear Fog Lamp (T79)

Scheme 8

Scheme 8: Park Lamp Control and Right Park Lamps
Scheme 8: Park Lamp Control and Right Park Lamps

Scheme 9

Scheme 9: Left Park Lamps
Scheme 9: Left Park Lamps

Scheme 10

Scheme 10: Turn Signal/Stop Lamps Controls and Indicators, Brake Applied Signal
Scheme 10: Turn Signal/Stop Lamps Controls and Indicators, Brake Applied Signal

Scheme 11

Scheme 11: Front and Outside Mirror Turn Signals
Scheme 11: Front and Outside Mirror Turn Signals

Scheme 12

Scheme 12: Rear Turn Signal/Stop Lamps and CHMSL (except T89)
Scheme 12: Rear Turn Signal/Stop Lamps and CHMSL (except T89)

Scheme 13

Scheme 13: Rear Turn Signal/Stop Lamps and CHMSL (T89)
Scheme 13: Rear Turn Signal/Stop Lamps and CHMSL (T89)

Scheme 14

Scheme 14: Backup Lamps
Scheme 14: Backup Lamps

Scheme 15

Scheme 15: Door Switches
Scheme 15: Door Switches

Scheme 16

Scheme 16: Headlamp Switch and Power, Courtesy Lamps
Scheme 16: Headlamp Switch and Power, Courtesy Lamps

Scheme 17

Scheme 17: Headliner Lamps
Scheme 17: Headliner Lamps

Scheme 18

Scheme 18: LED Dimming (1 of 2)
Scheme 18: LED Dimming (1 of 2)

Scheme 19

Scheme 19: LED Dimming (2 of 2)
Scheme 19: LED Dimming (2 of 2)

Scheme 20

Scheme 20: Lamp Dimming (1 of 2)
Scheme 20: Lamp Dimming (1 of 2)

Scheme 21

Scheme 21: Lamp Dimming (2 of 2)
Scheme 21: Lamp Dimming (2 of 2)

Diagnostic Code Index

DTCDescription
DTC B1395DTC B1395 03 Device Voltage Reference Output 1 Circuit Voltage Below Threshold DTC B1395 07 Device Voltage Reference Output 1 Circuit Voltage Above Threshold
DTC B1461 or B1462DTC B1461 00 Left Headlamp Horizontal Motor Circuit DTC B1462 00 Right Headlamp Horizontal Motor Circuit
DTC B2530DTC B2530 00 Front Fog Lamp Control Circuit
DTC B2540DTC B2540 00 Rear Fog Lamps Control Circuit
DTC B2545DTC B2545 00 Backup Lamps Circuit
DTC B2575DTC B2575 00 Headlamp Control Circuit
DTC B257ADTC B257A 00 Headlamp Switch Input Signal Mismatch
DTC B257CDTC B257C 00 Left Headlamp Assembly
DTC B257DDTC B257D 00 Right Headlamp Assembly
DTC B2580DTC B2580 00 Headlamp High Beam Control Circuit
DTC B2585DTC B2585 00 Left Parklamp Control Circuit
DTC B2600DTC B2600 00 Daytime Running Lamp Control Circuit
DTC B2605DTC B2605 00 Daytime Running Lamp Control 2 Circuit
DTC B2610DTC B2610 00 Passenger Compartment Dimming 1 Circuit
DTC B2615DTC B2615 00 Passenger Compartment Dimming 2 Circuit
DTC B2625DTC B2625 00 Display Dimming Pulse Width Modulation (PWM) Output Circuit
DTC B2645DTC B2645 03 Ambient Light Sensor Circuit Below Threshold DTC B2645 07 Ambient Light Sensor Circuit Above Threshold
DTC B2652DTC B2652 00 Passenger Compartment Dimming 3 Circuit
DTC B3445DTC B3445 00 Stop Lamp Circuit
DTC B3600DTC B3600 03 Passenger Compartment Dimming Request Signal Circuit Voltage Below Threshold
DTC C0277 or C0890DTC C0277 06 Brake Pedal Position Sensor Circuit Short to Ground or Open DTC C0277 07 Brake Pedal Position Sensor Circuit Voltage Above Threshold DTC C0277 09 Brake Pedal Position Sensor Circuit Rate of Change Above Threshold DTC C0277 4B Brake Pedal Position Sensor Calibration Not Learned DTC C0890 03 Device Voltage Reference Output 3 Circuit Voltage Below Threshold DTC C0890 07 Device Voltage Reference Output 3 Circuit Voltage Above Threshold
DTC C0297DTC C0297 00 Brake Applied Output Circuit
DTC P1574DTC P1574 00 Stop Lamp Switch Circuit

DIAGNOSTIC CODE INDEX

Diagnostic Instructions

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
I/P Dimming 12 V ReferenceB1395 03, B3600 03B1395 03, B3600 03B1395 07
Instrument Panel Lamps Dimmer Switch SignalB3600 03B3600 031
1. Interior Backlighting Inoperative

Circuit/System Description

The body control module (BCM) supplies a voltage reference through the instrument panel (I/P) dimming voltage reference circuit to the interior lamp dimmer switch, which is part of the headlamp switch. When the dimmer switch is placed in a desired brightness position, reference voltage is applied through the dimmer switch rheostat and the I/P lamps dimmer switch signal circuit to the BCM. The BCM interprets this voltage signal, then applies a pulse width modulated (PWM) voltage through the I/P lamps supply voltage circuit and the LED dimming supply circuit to all related interior lamps, illuminating them to the desired level of brightness.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

B1395 03

The BCM detects a voltage that is lower than 11.8 V on the I/P dimming voltage reference circuit.

B1395 07

The BCM detects a voltage that is greater than 12.2 V on I/P dimming voltage reference circuit.

Action Taken When the DTC Sets

The I/P lamps are not illuminated.

Conditions for Clearing the DTC

  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Reference Information

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON, cover the ambient light sensor, vary the interior lamp dimming switch from dim to full bright. The I/P lamps should dim and then become full bright.

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the headlamp switch.
  2. Ignition ON, test for 11.8-12.2 V between the 12 V reference circuit terminal 15 and ground. If greater than the specified range, test the 12 V reference circuit for short to voltage. If the circuit tests normal, replace the BCM. If less than the specified range, test the 12 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  3. If all circuits test normal, replace the headlamp switch.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Headlamp Switch Replacement»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  2. «Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

On vehicles equipped with adaptive forward lighting, the headlamps can turn left and right to improve visibility during turns.

Conditions for Running the DTCs

  1. Ignition ON.
  2. Gear selector in DRIVE.
  3. Headlamp switch in AUTO position.
  4. The ambient light sensor indicating Night.
  5. Vehicle speed greater than 2 km/h (1.3 mph).
  6. The steering wheel is turned greater than 10 degrees to the right or left.

Condition for Setting the DTC

A malfunction in the adaptive forward lighting system.

The adaptive forward lighting system is inoperative for the remainder of the ignition cycle.

The conditions for setting the DTC are no longer present.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Verify that DTC 1461 or DTC 1462 is not set.

  1. If the DTC is set, replace the appropriate headlamp assembly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Front Fog Lamp Relay Control12B2530 00
1. Fog Lamps Always On 2. Fog Lamps Inoperative

Voltage is applied at all times to the fog lamp relay. When the fog lamp switch is placed in the ON position, a ground signal is applied to the body control module (BCM) through the fog lamp switch signal circuit. The BCM then applies a ground to the fog lamp relay control circuit. This engages the fog lamp relay and applies voltage through the FOG LAMP fuse to the front fog lamps.

  1. The ignition is ON.
  2. Park lamps must be ON and the fog lamps must be commanded ON.

The BCM detects a short to voltage on the front fog lamp control circuit.

The front fog lamps do not illuminate.

  1. The conditions for setting the DTC are no longer present.
  2. A history DTC clears after 100 malfunction-free ignition cycles.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, command the Fog Lamps ON and OFF with a scan tool. The fog lamps should turn ON and OFF when changing between the commanded states.

  1. Ignition OFF, disconnect the fog lamp relay.
  2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 87 and ground. If the test lamp illuminates, test the control circuit for a short to voltage.
  3. Verify that a test lamp illuminates between the B+ circuit terminal 86 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the control circuit terminal 87 for a short to ground. If the circuit tests normal, test or replace the fog lamp relay.
  4. Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground. If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
  5. Disconnect the harness connector at the appropriate fog lamp - front.
  6. Test for less than 5 ohms between the ground circuit terminal B and ground If greater than the specified range, test the ground circuit for an open/high resistance.
  7. Connect the harness connector at the fog lamp - front.
  8. Connect a 15 A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87. Verify the fog lamp - front is activated. If the fog lamp - front does not activate and the circuit fuse is good, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the fog lamp - front. If the fog lamp - front does not activate and the circuit fuse is open, test the control circuit for a short to ground. If the circuit tests normal, test or replace the fog lamp - front.
  9. Connect a test lamp between the B+ circuit terminal 86 and the control circuit terminal 85.
  10. Command the Fog Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM. If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  11. If all circuits test normal, test or replace the fog lamp relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Relay Replacement (Within an Electrical Center)»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions__relay-replacement-within-an-electrical-center) , «Relay Replacement (Attached to Wire Harness)»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
  2. «Front Fog Lamp Replacement (Enclave)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Front Fog Lamp Replacement (Acadia)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  3. «Front Fog Lamp Bulb Replacement (Enclave)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Front Fog Lamp Bulb Replacement (Acadia)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  4. «Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Rear Fog Lamp Relay Control211
Rear Fog Lamp Switch SignalB2540 0011
Rear Fog Lamp Control211
Headlamp Switch Ground1
Rear Fog Lamp Ground1
1. Rear Fog Lamps Inoperative 2. Rear Fog Lamps always ON

The body control module (BCM) controls the rear fog lamps based on inputs from the headlamp switch. When the rear fog lamp switch is pressed, a ground path is provided on the rear fog lamp switch signal circuit to the BCM, indicating the rear fog lamps ON command. In response to this signal, the BCM grounds the rear fog lamp relay control circuit energizing the Rear Fog Lamp Relay. With the rear fog lamp relay energized, battery voltage is applied through the RR FOG Fuse and the rear fog lamp control circuits illuminating the rear fog lamps.

  1. Battery voltage must be between 9-16 V.
  2. Rear fog lamps ON.

The BCM detects a short to ground in the rear fog lamp switch signal circuit.

The rear fog lamps will not operate when the park lamps are ON and the rear fog lamp switch is active.

  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, disconnect the harness connector at the headlamp switch.
  2. Verify that a test lamp illuminates between B+ and the ground circuit terminal 8. If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool Rear Fog Lamp Switch parameter is INACTIVE. If not the specified value, test the signal circuit terminal 10 for a short to ground. If the circuit tests normal, replace the BCM.
  4. Install a 3 A fused jumper wire between the signal circuit terminal 10 and the ground circuit terminal 8. Verify the scan tool Rear Fog Lamp Switch parameter is ACTIVE. If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the headlamp switch.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Headlamp Switch Replacement»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  2. «Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Back Up Lamps ControlB2545 0012
1. Backup Lamps Inoperative 2. Backup Lamps Always On

When the PRNDL is placed in the REVERSE position, a signal is sent to the body control module (BCM). The BCM then applies voltage through the backup lamps control circuit to the back up lamps. The engine may need to be running for the backup lamps to function.

  1. The ignition is ON.
  2. The back up lamps must be commanded ON.

The BCM detects a short to ground on the back up lamp control circuit when the back up lamps are being commanded ON.

The back up lamps do not illuminate.

  1. The conditions for setting the DTC are no longer present.
  2. A history DTC clears after 100 malfunction-free ignition cycles.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, command the backup lamps ON and OFF with a scan tool. The backup lamps should turn ON and OFF when changing between the commanded states.

  1. Ignition OFF, disconnect the harness connector at the backup lamp.
  2. Test for less than 5 ohms between the ground circuit terminal listed below and ground: RPO Z88 - terminal 1 RPO WDA - terminal 2 RPO W49/X88 - terminal B If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the control circuit terminal listed below and the ground circuit terminal: RPO Z88 - terminal 2 RPO WDA - terminal 1 RPO W49/X88 - terminal A
  4. Command the Backup Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the backup lamp.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Backup Lamp Replacement»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  2. «Backup Lamp Bulb Replacement (Acadia)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Backup Lamp Bulb Replacement (Enclave)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Backup Lamp Bulb Replacement (Traverse)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  3. «Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Headlamp Low Beam Relay Control21B2575 00
1. Headlamps Inoperative 2. Headlamps Always ON

The low beam headlamps are controlled by the body control module (BCM). The BCM grounds the headlamp low beam relay control circuit in order to energize the HID/LO BEAM relay coil. The HID/LO BEAM relay then sends voltage to the low beam headlamps.

  1. The headlamps are commanded ON.
  2. The headlamp dimmer switch must be in the low beam position.

The headlamp low beam relay control circuit is shorted to voltage.

The BCM turns off the headlamp low beam relay control for the remainder of the ignition cycle.

  1. The conditions for setting the DTC are no longer present.
  2. A history DTC clears after 100 malfunction-free ignition cycles.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, command the Low Beams ON and OFF with a scan tool. The low beam headlamps should turn ON and OFF when changing between the commanded states.

  1. Ignition OFF, disconnect the headlamps low beam relay.
  2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 87 and ground. If the test lamp illuminates, test the control circuit for a short to voltage.
  3. Verify that a test lamp illuminates between the B+ circuit terminal 85 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  4. Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground. If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
  5. Disconnect the harness connector at the appropriate headlamp - low beam.
  6. Test for less than 5 ohms between the ground circuit terminal listed below and ground: RPO WDA/X88 - terminal A RPO Z88 - terminal B RPO W49/TVD - terminal 6 If greater than the specified range, test the ground circuit for an open/high resistance.
  7. Connect the harness connector at the headlamp - low beam.
  8. Connect a 10 A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87. Verify the headlamp - low beam is activated. If the headlamp - low beam does not activate and the circuit fuse is good, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the headlamp - low beam. If the headlamp - low beam does not activate and the circuit fuse is open, test the control circuit for a short to ground. If the circuit tests normal, test or replace the headlamp - low beam.
  9. Connect a test lamp between the B+ circuit terminal 85 and the control circuit terminal 86.
  10. Command the Low Beams ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM. If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  11. If all circuits test normal, test or replace the headlamps low beam relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Relay Replacement (Within an Electrical Center)»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions__relay-replacement-within-an-electrical-center) , «Relay Replacement (Attached to Wire Harness)»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
  2. «Headlamp Replacement (Acadia)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Headlamp Replacement (Traverse with TVP)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Headlamp Replacement (Enclave)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  3. «Headlamp Bulb Replacement (Traverse with TVP)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Headlamp Bulb Replacement (Low Beam without T96)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Headlamp Bulb Replacement (High Beam without T96)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  4. «Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Headlamp Switch Off SignalB257A 0031
Headlamp Switch On SignalB257A 0021
Headlamp Ground2, 3
1. Headlamps Always ON 2. Headlamps Inoperative From Switch 3. Unable To Turn OFF Automatic Headlamps

When the headlamp switch is in the OFF position, the body control module (BCM) receives a ground signal through the headlamp switch OFF circuit and an open signal on the park lamp ON circuit and headlamps ON circuit. When the headlamp switch is in the PARK or HEAD position, the BCM receives an open signal through the headlamp switch OFF circuit and a ground signal through the park lamp ON circuit or headlamp ON circuit.

The ignition is ON.

The BCM receives an unexpected signal along either the headlamp OFF circuit or the headlamp ON circuit.

The BCM disregards the headlamp switch input and defaults to automatic headlamp function.

The BCM clears this code from current when the fault is removed from the system.

Schematic Reference

  1. «Headlights/Daytime Running Lights (DRL) Schematics»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  2. «Exterior Lights Schematics»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, turn the headlamp switch between the OFF and PARK positions. The park lamps should turn ON and OFF when changing between the selected states.

  1. Ignition OFF, disconnect the harness connector at the headlamp switch.
  2. Verify that a test lamp illuminates between the ground circuit terminal 8 and B+. If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool Auto Hdlp. Disable Sw. parameter is Inactive. If not the specified value, test the signal circuit terminal 3 for a short to ground. If the circuit tests normal, replace the BCM.
  4. Verify the scan tool Headlamp Switch parameter is Inactive. If not the specified value, test the signal circuit terminal 1 for a short to ground. If the circuit tests normal, replace the BCM.
  5. Verify the scan tool Parklamp Switch parameter is Inactive. If not the specified value, test the signal circuit terminal 2 for a short to ground. If the circuit tests normal, replace the BCM.
  6. If all circuits test normal, test or replace the headlamp switch.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Headlamp Switch Replacement»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  2. «Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

On vehicles equipped with adaptive forward lighting, the headlamps can turn left and right to improve visibility during turns.

  1. Ignition ON.
  2. Gear selector in DRIVE.
  3. Headlamp switch in AUTO position.
  4. The ambient light sensor indicating Night.
  5. Vehicle speed greater than 2 km/h (1.3 mph).
  6. The steering wheel is turned greater than 10 degrees to the right or left.

A malfunction internal to the left headlamp assembly.

The adaptive forward lighting system is inoperative for the remainder of the ignition cycle.

The conditions for setting the DTC are no longer present.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Verify that DTC B257C is not set.

  1. If the DTC is set, replace the left headlamp assembly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

On vehicles equipped with adaptive forward lighting, the headlamps can turn left and right to improve visibility during turns.

  1. Ignition ON.
  2. Gear selector in DRIVE.
  3. Headlamp switch in AUTO position.
  4. The ambient light sensor indicating Night.
  5. Vehicle speed greater than 2 km/h (1.3 mph).
  6. The steering wheel is turned greater than 10 degrees to the right or left.

A malfunction internal to the right headlamp assembly.

The adaptive forward lighting system is inoperative for the remainder of the ignition cycle.

The conditions for setting the DTC are no longer present.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Verify that DTC B257D is not set.

  1. If the DTC is set, replace the right headlamp assembly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Headlamp High Beam Relay Control21B2580 00
1. Headlamps Inoperative - High Beams 2. Headlamps Always On - High Beams

When the body control module (BCM) receives a ground signal from the multifunction high beam or flash to pass (FTP) switch commanding to illuminate the high beam headlamps, the BCM will energize the high beam relay by grounding the high beam relay control circuit.

The battery voltage must be between 9-16 V.

The high beam headlamp relay control circuit is shorted to voltage.

The high beam headlamps will not operate or will remain always on.

  1. This DTC will clear on current status after the condition for setting the fault is corrected.
  2. A history DTC will clear after 100 consecutive ignition cycles without a fault present.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, command the High Beams ON and OFF with a scan tool. The high beams should turn ON and OFF when changing between the commanded states.

  1. Ignition OFF, disconnect the headlamp high beam relay.
  2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 87 and ground. If the test lamp illuminates, test the control circuit for a short to voltage.
  3. Verify that a test lamp illuminates between the B+ circuit terminal 85 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  4. Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground. If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
  5. Disconnect the harness connector at the appropriate headlamp - high beam.
  6. Test for less than 5 ohms between the ground circuit terminal listed below and ground: With RPO W49- Terminal 1 With RPO WDA - Terminal 3 With RPO Z88 - Terminal I With RPO TSH or T26 - Terminal 1 Without RPO TVD/W49 - Terminal A If greater than the specified range, test the ground circuit for an open/high resistance.
  7. Connect the harness connector at the headlamp - high beam.
  8. Connect a 10 A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87. Verify the headlamp - high beam is activated. If the headlamp - high beam does not activate and the circuit fuse is good, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the headlamp - high beam. If the headlamp - high beam does not activate and the circuit fuse is open, test the control circuit for a short to ground. If the circuit tests normal, test or replace the headlamp - high beam.
  9. Connect a test lamp between the B+ circuit terminal 85 and the control circuit terminal 86.
  10. Command the High Beams ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM. If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  11. If all circuits test normal, test or replace the headlamps high beam relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Relay Replacement (Within an Electrical Center)»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions__relay-replacement-within-an-electrical-center) , «Relay Replacement (Attached to Wire Harness)»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
  2. «Headlamp Replacement (Acadia)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Headlamp Replacement (Traverse with TVP)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Headlamp Replacement (Enclave)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  3. «Headlamp Bulb Replacement (Traverse with TVP)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Headlamp Bulb Replacement (Low Beam without T96)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Headlamp Bulb Replacement (High Beam without T96)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  4. «Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Park Lamp Relay Control21B2585 00
1. Park Lamps Inoperative 2. Park Lamps Always On

Battery positive voltage is supplied to the PRK LAMP relay at all times . The body control module (BCM) grounds the park lamp relay control circuit in order to activate the relay. With the park lamp relay activated, voltage is supplied to the park lamp control circuit illuminating the park lamps, license lamps, and marker lamps.

  1. The ignition switch is in the RUN position.
  2. The ambient light sensor senses a dark condition, automatic lamp control (ALC) park lamps ON, or the headlamp switch is in the park or head ON position.

The park lamp control circuit is shorted to voltage.

The park lamps are inoperative.

100 consecutive ignition cycles have been recorded without the DTC being detected.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, command the Parking Lamps ON and OFF with a scan tool. The park lamps should turn ON and OFF when changing between the commanded states.

Before beginning this circuit/system test, review the schematic to verify

  1. Park lights the vehicle is equipped with.
  2. Component locations on the park lighting control circuit
  3. Each component's control and ground circuit terminals
  1. Ignition OFF, disconnect the PRK LAMP relay.
  2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 87 and ground. If the test lamp illuminates, test the control circuit for a short to voltage.
  3. Verify that a test lamp illuminates between the B+ circuit terminal 85 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  4. Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground. If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
  5. Disconnect the harness connector at the appropriate park lamp.
  6. Test for less than 5 ohms between the ground circuit terminal and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  7. Connect the harness connector at the park lamp.
  8. Connect a 10 A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87. Verify the park lamp is activated. If the park lamp does not activate and the circuit fuse is good, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the park lamp. If the park lamp does not activate and the circuit fuse is open, test the control circuit for a short to ground. If the circuit tests normal, test or replace the park lamp.
  9. Connect a test lamp between the B+ circuit terminal 85 and the control circuit terminal 86.
  10. Command the Parking Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM. If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  11. If all circuits test normal, test or replace the PRK LAMP relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Relay Replacement (Within an Electrical Center)»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions__relay-replacement-within-an-electrical-center) , «Relay Replacement (Attached to Wire Harness)»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
  2. Refer to the appropriate replacement procedure for the lighting component that requires replacement.
  3. «Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
DRL Relay Control11B2600 00
1. Daytime Running Lamps Malfunction

The ambient light sensor is used to monitor outside lighting conditions. The ambient light sensor provides a voltage signal that will vary between 0.2 and 4.9 V depending on outside lighting conditions. The body control module (BCM) provides a 5 V reference signal to the ambient light sensor. The body control module (BCM) monitors the ambient light sensor signal circuit to determine if outside lighting conditions are correct for either daytime running lights (DRL) or automatic lamp control (ALC) when the headlamp switch is in the AUTO position. In daylight conditions, the BCM will command the DRLs ON by applying ground to the DRL relay via the DRL relay control circuit. When the BCM applies ground to the DRL relay control circuit, the DRL relay coil energizes causing the relay switch contacts to close. With the DRL relay switch contacts closed, battery voltage flows through the DRL fuse to the left and right DRL lamps. Any function or condition that turns on the headlamps will cancel DRL operation.

  1. Battery voltage must be between 9-16 V.
  2. Headlamp switch in AUTO position.

The BCM detects a short to voltage in the DRL relay control circuit.

The BCM will disable the DRL relay control circuit.

  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON, verify with a scan tool the park brake switch parameter displays RELEASED. If not the specified value, refer to «Symptoms - Park Brake»(/buick/enclave/i-2007-2013/remont/parking-brake-system/#parking-brake-system__symptoms-park-brake) .
  2. Command the DRLs ON and OFF with a scan tool. The daytime running lights should turn ON and OFF when changing between the commanded states. If the daytime running lights do not turn ON and OFF when changing between the commanded states, refer to Circuit/System Testing.
  1. Ignition OFF, disconnect the DRL relay.
  2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 87 and ground. If the test lamp illuminates, test the control circuit for a short to voltage.
  3. Verify that a test lamp illuminates between the B+ circuit terminal 86 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  4. Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground. If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
  5. Disconnect the harness connector at the appropriate daytime running lamp.
  6. Test for less than 5 ohms between the ground circuit terminal listed below and ground: RPO WDA - Terminal 1 RPO W49/Z88 - Terminal 3 RPO Z88 - Terminal B RPO WDA/X88 - Terminal A If greater than the specified range, test the ground circuit for an open/high resistance.
  7. Connect the harness connector at the daytime running lamp.
  8. Connect a 10 A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87. Verify the daytime running lamp is activated. If the daytime running lamp does not activate and the circuit fuse is good, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the daytime running lamp. If the daytime running lamp does not activate and the circuit fuse is open, test the control circuit for a short to ground. If the circuit tests normal, test or replace the daytime running lamp.
  9. Connect a test lamp between the B+ circuit terminal 86 and the control circuit terminal 85.
  10. Command the DRL ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM. If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  11. If all circuits test normal, test or replace the DRL relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Relay Replacement (Within an Electrical Center)»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions__relay-replacement-within-an-electrical-center) , «Relay Replacement (Attached to Wire Harness)»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
  2. «Headlamp Replacement (Acadia)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Headlamp Replacement (Traverse with TVP)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Headlamp Replacement (Enclave)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  3. «Headlamp Bulb Replacement (Traverse with TVP)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Headlamp Bulb Replacement (Low Beam without T96)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Headlamp Bulb Replacement (High Beam without T96)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  4. «Daytime Running Lamp Replacement»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  5. «Daytime Running Lamp Bulb Replacement (Enclave)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  6. «Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
DRL 2 Relay Control11B2605 00
1. Daytime Running Lamps Malfunction

The ambient light sensor is used to monitor outside lighting conditions. The ambient light sensor provides a voltage signal that will vary between 0.2 and 4.9 V depending on outside lighting conditions. The body control module (BCM) provides a 5 V reference signal to the ambient light sensor. The body control module (BCM) monitors the ambient light sensor signal circuit to determine if outside lighting conditions are correct for either daytime running lights (DRL) or automatic lamp control (ALC) when the headlamp switch is in the AUTO position. In daylight conditions, the BCM will command the DRLs ON by applying ground to the DRL 2 relay via the DRL 2 relay control circuit. When the BCM applies ground to the DRL 2 relay control circuit, the DRL 2 relay coil energizes causing the relay switch contacts to close. With the DRL 2 relay switch contacts closed, battery voltage flows through the DRL 2 fuse to the left and right DRL lamps. Any function or condition that turns on the headlamps will cancel DRL operation.

  1. Battery voltage must be between 9-16 V.
  2. Headlamp switch in AUTO position.

The BCM detects a short to voltage in the DRL 2 relay control circuit.

The BCM will disable the DRL 2 relay control circuit.

  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON, verify with a scan tool the park brake switch parameter displays RELEASED. If not the specified value, refer to «Symptoms - Park Brake»(/buick/enclave/i-2007-2013/remont/parking-brake-system/#parking-brake-system__symptoms-park-brake) .
  2. Command the DRLs ON and OFF with a scan tool. The daytime running lights should turn ON and OFF when changing between the commanded states. If the daytime running lights do not turn ON and OFF when changing between the commanded states, refer to Circuit/System Testing below.
  1. Ignition OFF, disconnect the DRL 2 relay.
  2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 87 and ground. If the test lamp illuminates, test the control circuit for a short to voltage.
  3. Verify that a test lamp illuminates between the B+ circuit terminal 86 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  4. Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground. If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
  5. Disconnect the harness connector at the appropriate daytime running lamp.
  6. Test for less than 5 ohms between the ground circuit terminal listed below and ground: RPO WDA - Terminal 1 RPO W49/Z88 - Terminal 3 If greater than the specified range, test the ground circuit for an open/high resistance.
  7. Connect the harness connector at the daytime running lamp.
  8. Connect a 10 A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87. Verify the daytime running lamp is activated. If the daytime running lamp does not activate and the circuit fuse is good, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the daytime running lamp. If the daytime running lamp does not activate, and the circuit fuse is open, test the control circuit for a short to ground. If the circuit tests normal, test or replace the daytime running lamp.
  9. Connect a test lamp between the B+ circuit terminal 86 and the control circuit terminal 85.
  10. Command the DRL ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM. If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  11. If all circuits test normal, test or replace the DRL 2 relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Relay Replacement (Within an Electrical Center)»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions__relay-replacement-within-an-electrical-center) , «Relay Replacement (Attached to Wire Harness)»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
  2. «Daytime Running Lamp Replacement»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  3. «Daytime Running Lamp Bulb Replacement (Enclave)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  4. «Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
LED Backlight Lamp ControlB2610 0021
1. Interior LED Backlighting Does Not Dim 2. Interior LED Backlighting Inoperative

The body control module (BCM) supplies a voltage reference through the instrument panel (I/P) dimming voltage reference circuit to the interior lamp dimmer switch, which is part of the headlamp switch. When the dimmer switch is placed in a desired brightness position, reference voltage is applied through the dimmer switch rheostat and the I/P lamps dimmer switch signal circuit to the BCM. The BCM interprets this voltage signal, then applies a pulse width modulated voltage through the LED backlight lamp control circuit illuminating the interior backlighting components.

  1. The ignition is ON.
  2. The headlamps or park lamps ON.

The BCM detects a short to ground on the LED backlight lamp control circuit.

The BCM will not DIM or illuminate any LED backlighting supplied by the backlight lamp control circuits.

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

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, command LED Dimming ON and OFF with a scan tool. The LED Dimming components should turn ON and OFF when changing between the commanded states.

Note. Each back lighted component may need to be disconnected to isolate a short to voltage or short to ground. Use the schematic to identify the following: Back lighted components the vehicle is equipped with. Component locations on the back lighting dimming control circuit Each component's control and ground circuit terminals

  1. Ignition OFF, disconnect the harness connector at any component with inoperative backlighting.
  2. Ignition OFF, scan tool disconnected, interior lamps OFF, doors CLOSED, test for less than 5 ohms between the ground circuit and ground. If greater than the specified value, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the control circuit terminal and ground.
  4. Command the Incandescent Dimming Control ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the component with the inoperative backlighting.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. Refer to the appropriate replacement procedure for the lighting component that requires replacement.
  2. «Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Steering Wheel Dimming ControlB2615 00B2615 00
Courtesy Lamps ControlB2615 0021
1. Courtesy Lamps Always On 2. Courtesy Lamps Inoperative

Battery voltage for the courtesy lamps is supplied at all times, from the INAD/PWR/LED Fuse located in the I/P fuse block to the body control module (BCM). When the BCM receives a signal to command the courtesy lamps ON, it then applies voltage through the courtesy lamps control circuits to the courtesy lamps.

The BCM attempts to illuminate the courtesy lamps.

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

The BCM will not attempt to activate courtesy lamps.

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

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, command the Courtesy Lamps ON and OFF with a scan tool. The courtesy lamps should turn ON and OFF when changing between the commanded states.

Note. Each dimming lighting component may need to be disconnected to isolate a short to voltage or short to ground. Use the schematic to identify the following: Dimming lighting components the vehicle is equipped with. Component locations on the dimming control circuit Each component's control and ground circuit terminals

  1. Ignition OFF, disconnect the harness connector at any component with inoperative dimming lighting.
  2. Ignition OFF, scan tool disconnected, interior lamps OFF, doors CLOSED, test for less than 5 ohms between the ground circuit and ground. If greater than the specified value, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the control circuit terminal and ground.
  4. Command the Courtesy Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the component with the inoperative dimming lighting.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. Refer to the appropriate replacement procedure for the lighting component that requires replacement.
  2. «Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
LED Dimming SupplyB2625 0021
1. Interior Backlighting Always OFF 2. Interior Backlighting Does Not Dim

The body control module (BCM) supplies a voltage reference through the instrument panel (I/P) dimming voltage reference circuit to the interior lamp dimmer switch, which is part of the headlamp switch. When the dimmer switch is placed in a desired brightness position, reference voltage is applied through the dimmer switch rheostat and the I/P lamps dimmer switch signal circuit to the BCM. The BCM interprets this voltage signal then applies a pulse width modulated (PWM) voltage through the LED dimming supply circuit illuminating the heated seat switches to the requested level.

The ignition is ON.

The BCM detects a short to ground on the LED dimming supply circuit.

The BCM will not attempt to illuminate the LED indicator lamps.

  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 100 consecutive malfunction ignition cycles have occurred.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, cover the ambient light sensor, vary the interior lamp dimming switch from dim to full bright. The LED lamps should dim and then become full bright.

Note. Each back lighted component may need to be disconnected to isolate a short to voltage or short to ground. Use the schematic to identify the following: Back lighted components the vehicle is equipped with. Component locations on the back lighting dimming control circuit Each component's control and ground circuit terminals

  1. Ignition OFF, disconnect the harness connector at any component with inoperative backlighting.
  2. Ignition OFF, scan tool disconnected, interior lamps OFF, doors CLOSED, test for less than 5 ohms between the ground circuit and ground. If greater than the specified value, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the control circuit terminal and ground.
  4. Command the Incandescent Dimming Control ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the component with the inoperative backlighting.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. Refer to the appropriate replacement procedure for the lighting component that requires replacement.
  2. «Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Ambient Light Sensor Signal CircuitB2645 03B2645 07B2645 07
Ambient Light Sensor GroundB2645 07

The ambient light sensor is used to monitor outside lighting conditions. The body control module (BCM) provides a 5 V reference signal to the ambient light sensor. The sensor is a variable resistor, it's resistance changes as outside lighting conditions changes. With the headlamp switch in the AUTO position, the BCM monitors the sensor signal circuit to determine if the outside lighting conditions are correct for either daytime running lamps (DRL) or headlamp low beam operation. In daylight conditions, the BCM will command the DRLs ON. In low light conditions, the BCM will command the low beam headlamps ON.

  1. The ignition is ON.
  2. The headlamp switch in the AUTO position.

DTC B2645 03

The DTC will set when the BCM detects the ambient light sensor signal voltage is below 0.196 V.

DTC B2645 07

The DTC will set when the BCM detects the ambient light sensor signal voltage is above 4.9 V.

The BCM defaults to low light status and commands the low beam headlamps ON.

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

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, disconnect the harness connector at the ambient light sensor.
  2. Ignition OFF, scan tool disconnected, ALL doors closed, test for less than 10 ohms between the ground circuit terminal listed below and ground. Terminal B (with C67) Terminal C (with CJ2) If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool Ambient Light Sensor parameter is greater than 4.65 volts. If less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the BCM.
  4. Install a 3 A fused jumper wire between the signal circuit terminal and the ground circuit terminal listed below. Verify the scan tool Ambient Light Sensor parameter is less than 0.196 V. Terminal A and terminal B (with C67) Terminal D and terminal C (with CJ2) If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, replace the ambient light sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Daytime Running Lamp (DRL) Ambient Light Sensor Replacement (Without UV6)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Daytime Running Lamp (DRL) Ambient Light Sensor Replacement (With UV6)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  2. «Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Console and Door Dimming ControlB2652 00B2652 00
I/P Lamps ControlB2652 0021
1. Interior Backlighting Does Not Dim 2. Interior Backlighting Inoperative

The body control module (BCM) supplies a voltage reference through the instrument panel (I/P) dimming voltage reference circuit to the interior lamp dimmer switch, which is part of the headlamp switch. When the dimmer switch is placed in a desired position, reference voltage is applied through the dimmer switch rheostat and the I/P lamps dimmer switch signal circuit to the BCM. The BCM interprets this voltage signal, then applies a pulse width modulated (PWM) voltage through the instrument panel lamp control circuits illuminating the instrument panel components.

  1. The ignition is ON.
  2. The headlamps or park lamps ON.

The BCM detects a short to ground on the instrument panel lamps control circuit.

The BCM does not attempt to illuminate the instrument panel lamps.

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

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Observe the scan tool Dimming Control Signal parameter. The parameter should change as the dimming is increased and decreased.

Note. Each dimming lighting component may need to be disconnected to isolate a short to voltage or short to ground. Use the schematic to identify the following: Dimming lighting components the vehicle is equipped with. Component locations on the dimming control circuit Each component's control and ground circuit terminals

  1. Ignition OFF, disconnect the harness connector at any component with inoperative dimming lighting.
  2. Ignition OFF, scan tool disconnected, interior lamps OFF, doors CLOSED, test for less than 5 ohms between the ground circuit and ground. If greater than the specified value, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the control circuit terminal and ground.
  4. Command the Courtesy Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the component with the inoperative dimming lighting.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. Refer to the appropriate replacement procedure for the lighting component that requires replacement.
  2. «Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Center High Mounted Stop Lamp ControlB3445 0011
Center High Mounted Stop Lamp Ground1
1. Center High Mounted Stop Lamp Malfunction

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 and center high mounted stop lamp (CHMSL) control circuit. The stop lamps on this vehicle will not illuminate unless the ignition is in the accessory, run, or crank positions. When the ignition is in the OFF position the stop lamps will not illuminate when the brake pedal is applied.

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

The BCM detects a short to ground in the CHMSL control circuit when the stop lamps are being commanded ON.

The BCM will not illuminate the CHMSL.

  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 100 malfunction-free ignition cycles have occurred.

Diagnostic Aids

Note. The stop lamps will not illuminate unless the ignition is in the ON position. For more detailed information concerning stop lamp operation, refer to Exterior Lighting Systems Description and Operation .

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, disconnect the harness connector at the CHMSL.
  2. Ignition OFF, test for less than 5.0 ohms between the ground circuit terminal 1 and ground If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the control circuit terminal 2 and ground.
  4. Ignition ON, turn the stop lamps ON and OFF by applying and releasing the brake pedal. The test lamp should turn ON and OFF when changing between the selected states. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, replace the CHMSL.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «High Mount Stop Lamp Replacement (Acadia)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «High Mount Stop Lamp Replacement (Traverse)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «High Mount Stop Lamp Replacement (Enclave)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  2. «Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
12-Volt ReferenceB1395 03, B3600 03B3600 032B1395 07
I/P Dimming SignalB3600 03B3600 031
1. Interior Backlighting Inoperative 2. Interior Backlighting Will Not Dim

The instrument panel (I/P) dimmer switch is used to increase and decrease the brightness of the interior backlighting components. The body control module (BCM) supplies a 12-volt reference through the instrument panel (I/P) dimming voltage reference circuit to the interior lamp dimmer switch, which is part of the headlamp switch. When the dimmer switch is placed in a desired brightness position, reference voltage is applied through the dimmer switch rheostat and the I/P lamps dimmer switch signal circuit to the BCM. The BCM interprets this voltage signal, then applies a pulse width modulated (PWM) voltage through the I/P lamps control circuit and the LED dimming control circuit to all related interior lamps, illuminating them to the desired level of brightness.

The ignition is ON.

  1. The BCM detects a short to ground or open in the 12-volt reference circuit.
  2. The BCM detects a short to ground or open in the I/P dimming signal circuit.

The I/P lamps are not illuminated.

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

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, cover the ambient light sensor, vary the interior lamp dimming switch from dim to full bright. The I/P lamps should dim and then become full bright.

  1. Ignition OFF, disconnect the harness connector at the headlamp switch.
  2. Ignition OFF, verify a test lamp illuminates between B+ and the ground circuit terminal 8 If less test lamp does not illuminate, test the ground circuit for an open/high resistance.
  3. Ignition ON, test for B+ between the B+ circuit terminal 15 and ground. If less than the specified range, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  4. Verify the scan tool Dimming Control Signal parameter is less than 0.2 volts. If greater than the specified range, test the signal circuit terminal 13 for a short to voltage. If the circuit tests normal, replace the BCM.
  5. Install a 3A fused jumper wire between the signal circuit terminal 13 and the B+ circuit terminal 15. Verify the scan tool Dimming Control Signal parameter is greater than 2.5 volts. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  6. If all circuits test normal, test or replace the headlamp switch.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Headlamp Switch Replacement»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  2. «Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Brake Position Sensor 5-Volt ReferenceC0277 06, C0890 03C0277 06C0277 06*, C0890 07
Brake Apply Sensor SignalC0277 06C0277 06C0277 07C0277 09, C0277 4B
Brake Position Sensor Low ReferenceC0277 06*
* Stop Lamps Are Always ON

The body control module (BCM) provides a 5-volt reference voltage and a low reference signal to the brake pedal position sensor (BPPS). When the brake pedal is applied, the BPPS sends a variable voltage signal, that will increase as the brake pedal is applied, through the brake apply sensor signal circuit to the BCM. In response to this signal, the BCM applies B+ to the stop lamps, center high mounted stop lamp (CHMSL), transmission control module (TCM), and engine control module (ECM). The stop lamps will not operate unless the ignition is in the ON position.

The ignition is ON.

C0277 06

The BCM detects a short to ground or open on the brake apply sensor signal circuit, or a short to ground or an open in the brake position sensor 5-volt reference circuit.

C0277 07

The BCM detects short to voltage on the brake apply sensor signal circuit.

C0277 09

The BCM detects the brake pedal position sensor reading is erroneous.

C0277 4B

The BCM detects that the brake pedal position sensor home position is not learned.

C0890 03

The BCM detects a short to ground in the brake position sensor 5-volt reference circuit.

C0890 07

The BCM detects a short to voltage in the brake position sensor 5-volt reference circuit.

  1. The Service Vehicle Soon indicator is commanded ON.
  2. If the DTC sets while the vehicle is running, the BCM will activate the brake lights when the vehicle transmission is not in the PARK position and the vehicle is not accelerating.
  3. For DTC C0277 4B, the stop lamps may not activate at the expected brake pedal positions.
  1. For DTC C0277 4B, a successful brake pedal position sensor calibration has been performed.
  2. A DTC will not clear the current status until the next ignition cycle.
  3. A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

The stop lamps will not illuminate unless the ignition is in the ON position.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

C0277 06, C0277 07, and C0890 03

  1. Ignition OFF, disconnect the harness connector at the brake pedal position sensor.
  2. Ignition OFF, verify that a test lamp illuminates between the low reference circuit terminal C and B+. If the test lamp does not illuminate, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the BCM.
  3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal A and ground. If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM. If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the BCM.
  4. Verify the scan tool BPP Sensor parameter is less than 2 counts. If greater than the specified value, test the signal circuit terminal B for a short to voltage. If the circuit tests normal, replace the BCM.
  5. Install a 3A fused jumper wire between the signal circuit terminal B and the 5-volt reference circuit terminal A. Verify the scan tool BPP Sensor parameter is greater than 1000 counts. If less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  6. If all circuits test normal, test or replace the brake pedal position sensor.

C0277 09

  1. Replace the brake pedal position sensor.
  2. Perform the scan tool BPP Sensor Calibration procedure. Refer to «Brake Pedal Position Sensor Calibration»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system__brake-pedal-position-sensor-calibration) .
  3. Operate the vehicle within the Conditions for Running the DTC and verify the DTC does not reset. If the DTC resets, replace the BCM.

C0277 4B

  1. Ignition ON, verify that no other brake pedal position sensor DTCs are set. If other brake pedal sensor DTCs are set, diagnosis those DTCs first.
  2. Perform the scan tool BPP Sensor Calibration procedure. Refer to «Brake Pedal Position Sensor Calibration»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system__brake-pedal-position-sensor-calibration) .
  3. Observe the scan tool BPPS Status parameter. The reading should be Learned. If not the specified value, replace the brake pedal position sensor. If the DTC resets, replace the BCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Brake Pedal Position Sensor Replacement»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system__brake-pedal-position-sensor-replacement)
  2. «Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Brake SignalC0297 00

The body control module (BCM) provides a 5 V reference voltage and a low reference signal to the brake pedal position sensor (BPPS). When the brake pedal is applied, the BPPS sends a variable voltage signal, that will increase as the brake pedal is applied, through the stop lamp switch signal circuit to the BCM. The BCM then applies a signal through the stop lamp switch signal circuit to the engine control module (ECM) and trailer provision (RPO V92).

  1. The engine must be ON.
  2. The brake must be applied.

The BCM detects a short to ground in the brake applied output circuit.

  1. The BCM stores the DTC to memory.
  2. The Service Vehicle Soon indicator is commanded ON.

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

Schematic Reference

  1. «Exterior Lights Schematics»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  2. «Engine Controls Schematics»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-wiring-schematic-diagrams)

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, press and release the brake pedal. The stop lamps should turn ON and OFF when changing between the selected states.

  1. Ignition OFF, disconnect the harness connector at the X2 harness connector at the ECM.
  2. Connect a test lamp between the ECM signal circuit terminal 52 and ground.
  3. Ignition ON, press and release the brake pedal. The test lamp should turn ON and OFF when changing between the selected states. If the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance. If the circuit test normal, replace the TCM.
  4. If all circuit tests normal, replace the BCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for BCM, ECM, and TCM replacement, programming and setup

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The stop lamp switch signal circuit is a direct hardwire input to the transmission control module (TCM) from the body control module (BCM). The TCM module monitors the stop lamp signal circuit in order to detect when the brake pedal has been applied. When the brake pedal is pressed, the BCM sends a High Speed GM Lan message to the engine control module (ECM) indicating that the brake pedal has been applied. The BCM also sends a high voltage signal on the stop lamp signal circuit to the TCM module. The TCM module sends a universal asynchronous receiver transmitter low speed GM Lan message to the ECM indicating that a brake pedal application has occurred. The ECM will compare the GM LAN Low speed and GM LAN High Speed data message in order to confirm that both serial data messages match.

  1. DTC P0573 is not set.
  2. The engine speed is greater than 700 RPM.
  3. The traction control system or the antilock brake system are not active and have not failed.
  4. The vehicle speed is greater than 48 km/h (30 mph) in order to enable the diagnostic.
  1. The vehicle speed decreases by at least 4.2 km/h (2.6 mph) within 0.25 seconds.
  2. The TAC module does not detect a voltage signal on the Brake Pedal Position (BPP) signal circuit.
  3. The ECM does not detect a Brake Pedal Position Sensor (BPP) transition.
  1. The Cruise Control System is disabled.
  2. The ECM stores the DTC information into memory when the diagnostic runs and fails.
  3. The malfunction indicator lamp (MIL) will not illuminate.
  4. The ECM records the operating conditions at the time the diagnostic fails. The ECM stores this information in the Failure Records.
  1. A last test failed, or the current DTC, clears when the diagnostic runs and does not fail.
  2. A history DTC clears after 40 consecutive warm-up cycles, if failures are not reported by this or any other emission related diagnostic.
  3. Use a scan tool in order to clear the DTC.

Note. Repair any brake system related DTCs before performing this diagnostic.

In order to avoid a misdiagnosis, perform the following

  1. If a BCM has been replaced, the brake pedal position (BPP) sensor must be calibrated. Refer to «Brake Pedal Position Sensor Calibration»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system__brake-pedal-position-sensor-calibration) .
  2. Inspect for proper operation of the stop lamps. Refer to «Exterior Lighting Systems Description and Operation»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) .
  3. For an intermittent condition, refer to «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) .

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, observe the BPP Signal parameter in the ECM while applying and releasing the brake pedal. The parameter should change between Applied and Released when changing between the selected states. All brake lights should turn ON and OFF accordingly.

Note. Fix any Brake System related DTCs or symptoms before using this diagnostic.

  1. Ignition ON, perform the brake pedal position (BPP) sensor calibration procedure and verify the BPP is calibrated properly. Refer to «Brake Pedal Position Sensor Calibration»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system__brake-pedal-position-sensor-calibration) . If the BPP sensor will not calibrate properly, replace the BPP sensor.
  2. Ignition ON, apply the brake pedal and verify the scan tool BPP sensor parameter is Applied. If the parameter reads Released, test the BPP sensor signal circuit for an open/high resistance or short to ground. If circuit tests normal, replace the ECM.
  3. Apply the brake pedal, verify the brake lamps are illuminated. If the brake lamps do not illuminate, refer to «Stop Lamps Malfunction»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) .
  4. If all circuits test normal, replace the ECM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Brake Pedal Position Sensor Replacement»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system__brake-pedal-position-sensor-replacement)
  2. «Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) ECM replacement, programming and setup

Symptoms - Lighting

Note. The following steps must be completed before doing the Symptom tables.

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) . No DTCs are set. The control modules can communicate via the serial data link.
  2. 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»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) «Interior Lighting Systems Description and Operation»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)

Visual/Physical Inspection

  1. Inspect for aftermarket devices which could affect the operation of the lighting system. Refer to «Checking Aftermarket Accessories»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__checking-aftermarket-accessories) .
  2. 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

  1. «Adaptive Forward Lighting Malfunction»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  2. «Backup Lamps Malfunction»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  3. «Courtesy Lamps Malfunction»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  4. «Daytime Running Lamps Malfunction»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  5. «Front Fog Lamps Malfunction»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  6. «Rear Fog Lamps Malfunction»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  7. «Hazard Lamps Malfunction»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  8. «Headlamps Malfunction»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  9. «Interior Backlighting Malfunction»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  10. «Park, License, and/or Tail Lamps Malfunction»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  11. «Stop Lamps Malfunction»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  12. «Turn Signal Lamps and/or Indicators Malfunction»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Ignition Left Headlamp1, 22B1461 00
Ignition Right Headlamp1, 33B1462 00
Left Headlamp ControlB257C22
Right Headlamp ControlB257D33
Left Headlamp Ground2B1461 00
Right Headlamp Ground3B1462 00
1. All Headlamp Actuator Malfunction 2. Left Headlamp Actuator Malfunction 3. Right Headlamp Actuator Malfunction

Battery positive voltage is applied to the headlamp control module at all times. The headlamp control module has a normal operational voltage range of about 12.5-16 V and is only fully functional with the ignition switch is in the RUN position and the headlamp switch in the AUTOMATIC LIGHT position. The communications enable signal from the body control module (BCM) wakes the headlamp control module microprocessor. The headlamp control module receives serial data messages from the engine control module, transmission control module, electronic brake control module, and BCM with information regarding power mode, speed, steering angle, transmission gear selection, and headlamp switch status. The headlamp control module calculates the headlamp angle and sends commands to the left and right adaptive forward lighting system headlamp actuators. The headlamp actuators drive the headlamps to the position commanded by the headlamp control module. The headlamp control module monitors the headlamp actuator motor control circuits for proper circuit continuity and for shorts to ground or voltage. If a malfunction is detected, a DTC will be stored in memory and the driver will be notified with a message displayed over the driver information center located on the instrument cluster.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, disconnect the harness connector at the appropriate headlamp assembly.
  2. Test for less than 5 ohms between the ground circuit terminal listed below and ground: Left headlamp - terminal 4 Right headlamp - terminal 10 If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Disconnect the harness connector at the headlamp right.
  4. Ignition ON, headlamps ON, connect a test lamp between the ignition circuit terminal 1 and ground. The test lamp should illuminate. If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  5. If all circuits test normal, replace the appropriate headlamp assembly. Verify that the customer concern is not still present. If the customer concern is still present, replace the headlamp right.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Backup Lamps ControlB2545 0012
1. Backup Lamps Inoperative 2. Backup Lamps Always ON

When the PRNDL is placed in the REVERSE position, a serial data signal is sent from the transmission control module (TCM) to the body control module (BCM). The BCM then applies voltage through the backup lamps control circuit to the tail lamp assemblies illuminating the backup lamps. The engine may need to be running for the backup lamps to function.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, command the Backup Lamps ON and OFF with a scan tool. The backup lamps should turn ON and OFF when changing between the commanded states.

  1. Ignition OFF, disconnect the harness connector at the backup lamp.
  2. Test for less than 5 ohms between the following ground circuit terminal listed below and ground: RPO Z88 - terminal 1 RPO WDA - terminal 2 RPO W49/X88 - terminal B If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the control circuit terminal listed below and the ground circuit terminal: RPO Z88 - terminal 2 RPO WDA - terminal 1 RPO W49/X88 - terminal A
  4. Command the Backup Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the backup lamp.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Tail Lamp Replacement (Enclave)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system__tail-lamp-replacement-enclave) , «Tail Lamp Replacement (Acadia)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Tail Lamp Replacement (Traverse)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  2. «Backup Lamp Replacement»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  3. «Backup Lamp Bulb Replacement (Acadia)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Backup Lamp Bulb Replacement (Enclave)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Backup Lamp Bulb Replacement (Traverse)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  4. «Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
B+, BCM X4 Terminal 2B2615 00B2615 00
B+, BCM X3 Terminal 23, 43, 4
Courtesy Lamp ControlB2615 0011
Courtesy Lamp Defeat Signal151
Courtesy Lamp Switch ON Signal221
Inadvertent Courtesy Lamps Ground1, 3
1. Courtesy/Reading Lamps Malfunction 2. Dome Lamp Switch Malfunction 3. Inadvertent Power Courtesy Lamps Malfunction 4. Interior Backlighting Malfunction 5. Courtesy Lamp Defeat Inoperative

The courtesy lamps are controlled by the body control module (BCM). Inputs from the dome lamp switch and the door ajar switches are monitored by the BCM. When a door ajar switch is closed, or the dome lamp switch is turned to the ON position, the BCM supplies the B+ for the courtesy lamps.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON, observe the appropriate scan tool Door Open Sw. parameter while opening and closing the driver and passenger doors. The parameter should change between Open and Closed. If the parameter does not change between the selected states, refer to «Door Ajar Indicator Malfunction (With RPO AXC/AXE)»(/buick/enclave/i-2007-2013/remont/door-locks-anti-theft-systems/#power-door-lock-system-and-release-systems) , «Door Ajar Indicator Malfunction (Without RPO AXC/AXE)»(/buick/enclave/i-2007-2013/remont/door-locks-anti-theft-systems/#power-door-lock-system-and-release-systems) .
  2. Ignition ON, observe the appropriate scan tool Rear Door Ajar Sw. parameter while opening and closing the rear vehicle doors. The parameter should change between Door Ajar and Door Closed. If the parameter does not change between the selected states, refer to «Door Ajar Indicator Malfunction (With RPO AXC/AXE)»(/buick/enclave/i-2007-2013/remont/door-locks-anti-theft-systems/#power-door-lock-system-and-release-systems) , «Door Ajar Indicator Malfunction (Without RPO AXC/AXE)»(/buick/enclave/i-2007-2013/remont/door-locks-anti-theft-systems/#power-door-lock-system-and-release-systems) .
  3. Observe the scan tool Rear Closure Ajar Switch parameter while opening and closing the rear liftgate. The parameter should change between Active and Inactive. If the parameter does not change between the selected states, refer to «Liftgate Ajar Indicator Malfunction (Manual Liftgate)»(/buick/enclave/i-2007-2013/remont/door-locks-anti-theft-systems/#power-door-lock-system-and-release-systems) , «Liftgate Ajar Indicator Malfunction (Power Liftgate)»(/buick/enclave/i-2007-2013/remont/door-locks-anti-theft-systems/#power-door-lock-system-and-release-systems) .
  4. Cycle the dome lamp switch while observing the scan tool Ctsy. Lamp Actv. Reason parameter. The parameter should change between Manual and Manual Defeat. If the parameter does not change, refer to Courtesy Lamp Switch Malfunction.
  5. Command the Courtesy Lamps ON and OFF with a scan tool. The courtesy lamps should turn ON and OFF when changing between the commanded states. If the courtesy lamps do not turn ON and OFF when changing between the commanded states, refer to Courtesy Lamp Malfunction below.
  6. Command the Courtesy Lamps ON and OFF with a scan tool. The liftgate courtesy lamps should turn ON and OFF while changing between the commanded states. If the reading lamps do not turn ON and OFF when changing between the commanded states, refer to Liftgate Courtesy Lamp Malfunction below.
  7. Turn the reading lamps ON and OFF by using the reading lamp switches. The reading lamps should turn ON and OFF while changing between the selected states. If the cargo lamps do not turn ON and OFF when changing between the commanded states, refer to Reading Lamp Malfunction below.
  8. Turn the sunshade lamp ON and OFF by using the sunshade lamp switch. The sunshade lamp should turn ON and OFF while changing between the selected states. If the sunshade lamp does not turn ON and OFF when changing between the selected states, refer to Sunshade Illumination Malfunction below.

Courtesy Lamp Switch Malfunction

  1. Ignition OFF, disconnect the harness connector at the headlamp switch.
  2. Verify that a test lamp illuminates between the ground circuit terminal 8 and B+. If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
  3. Ignition ON, all doors closed, verify the scan tool Ctsy. Lamp Actv. Reason parameter is Off. If the parameter is Manual, test the signal circuit terminal 12 for a short to ground. If the circuit tests normal, replace the BCM.
  4. Connect a 3 A fused jumper wire between the signal circuit terminal 12 and ground. Verify the scan tool Ctsy. Lamp Actv. Reason parameter is Manual . If not the specified value, test the signal circuit for an open/high resistance or short to voltage. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the headlamp switch.

Courtesy Lamp Malfunction

  1. Ignition OFF, disconnect the X4 harness connector at the BCM.
  2. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 2 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the circuit fuse is open, test the courtesy lamp control circuits for a short to ground.
  3. Ignition OFF, connect the X4 harness connector at the BCM. Disconnect the harness connector at the appropriate courtesy lamp.
  4. Verify that a test lamp illuminates between the ground circuit terminal B and B+. If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
  5. Connect a test lamp between the control circuit terminal C and ground.
  6. Command the Courtesy Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF as commanded. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  7. If all circuits test normal, test or replace the courtesy lamp or courtesy lamp bulb.

Liftgate Courtesy Lamp Malfunction

  1. Disconnect the harness connector at the appropriate liftgate courtesy lamp.
  2. Ignition OFF, scan tool OFF, doors CLOSED, interior lamps OFF, test for less than 5.0 ohms between the ground circuit terminal 1 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the control circuit terminal 2 and ground.
  4. Command the Courtesy Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, replace the liftgate courtesy lamp.

Reading Lamp Malfunction

  1. Ignition OFF, disconnect the harness connector at the appropriate reading lamp.
  2. Test for less than 5 ohms between the ground circuit terminal B and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify a test lamp illuminates between the control circuit terminal A and ground. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  4. If all circuits test normal, test or replace the reading lamp.

Sunshade Illumination Malfunction

  1. Ignition OFF, disconnect the harness connector at the appropriate sunshade.
  2. Test for less than 5 ohms between the ground circuit terminal B and ground. If greater than the specified value, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify a test lamp illuminates between the control circuit terminal A and ground. If greater than the specified value, test the ground circuit for an open/high resistance.
  4. If all circuits test normal, test or replace the sunshade.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Headlamp Switch Replacement»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  2. Refer to the appropriate replacement procedure for the lighting component that requires replacement.
  3. «Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Ambient Light Sensor SignalB2645 03B2645 07B2645 07
Ambient Light Sensor GroundB2645 07
DRL Relay Control21B2600 00
DRL 2 Relay Control21B2605 00
Left DRL Control112
Right DRL Control112
1. Daytime Running Lamps (DRL) Inoperative 2. Daytime Running Lamps (DRL) Always ON

The body control module (BCM) receives a signal from the ambient light sensor indicating a low or high outside ambient light level. Under daylight conditions the BCM grounds the DRL relay control circuit energizing the DRL relay. The closed relay supplies voltage to the DRLs. Any time the headlamps are illuminated, the DRL will not illuminate.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Supply sufficient light to simulate daylight conditions to the ambient light sensor. Ignition ON, engine running, and the gear selector in drive. The DRLs should illuminate.

  1. Ignition OFF, disconnect the appropriate DRL relay.
  2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 87 and ground. If the test lamp illuminates, test the control circuit for a short to voltage.
  3. Verify that a test lamp illuminates between the B+ circuit terminal 86 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the control circuit for a short to ground. If the circuit tests normal, test or replace the DRL relay.
  4. Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground. If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
  5. Connect a test lamp between the B+ circuit terminal 86 and the control circuit terminal 85.
  6. Command the DRL ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM. If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  7. Connect a 10 A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87.
  8. Disconnect the harness connector at the appropriate daytime running light.
  9. Verify that a test lamp illuminates between the DRL control circuit listed below and ground: RPO W49/Z88 - terminal 1 RPO WDA - terminal 2 RPO WDA/X88 - terminal B RPO Z88 - terminal A If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance.
  10. Verify that a test lamp illuminates between the DRL ground circuit listed below and B+: RPO WDA - terminal 1 RPO W49/Z88 - terminal 3 RPO WDA/X88 - terminal A RPO Z88 - terminal B If the test lamp does not illuminate, test the ground circuit for a open/high resistance.
  11. If all circuits test normal, test or replace the DRL relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Relay Replacement (Within an Electrical Center)»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions__relay-replacement-within-an-electrical-center) , «Relay Replacement (Attached to Wire Harness)»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
  2. «Daytime Running Lamp Replacement»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  3. «Daytime Running Lamp Bulb Replacement (Enclave)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  4. «Headlamp Replacement (Acadia)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Headlamp Replacement (Traverse with TVP)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Headlamp Replacement (Enclave)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  5. «Headlamp Bulb Replacement (Traverse with TVP)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Headlamp Bulb Replacement (Low Beam without T96)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Headlamp Bulb Replacement (High Beam without T96)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  6. «Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Front Fog Lamp Switch Signal1, 32, 42, 4
Left Front Fog Lamp Control221
Right Front Fog Lamp Control443
Fog Lamp Relay Control1, 32, 4B2530 00
Headlamp Switch Ground2, 4
Left Front Left Fog Lamp Ground2
Right Front Fog Lamp Ground4
1. Left Fog Lamp Always ON 2. Left Front Fog Lamp Inoperative 3. Right Fog Lamps Always ON 4. Right Front Fog Lamp Inoperative

The body control module (BCM) controls the fog lamps based on inputs from the fog lamp switch. When the fog lamp switch is pressed, a ground path is provided on the front fog lamp switch signal circuit to the BCM, indicating the front fog lamps ON command. In response to this signal, the BCM grounds the fog lamp relay control circuit energizing the FOG LAMP Relay. With the fog lamp relay energized, battery voltage is applied through the FOG LAMPS Fuse and the fog lamp control circuits illuminating the front fog lamps.

When a fog lamp request is seen by the BCM, a serial data message is sent to the instrument panel cluster (IPC) requesting the fog lamp indicator be illuminated.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON, observe the scan tool Front Fog Lamps Switch parameter while turning the front fog lamps switch ON and OFF. The parameter should change between Active and Inactive. If the parameter does not change between the commanded states, refer to Fog Lamp Switch Malfunction below.
  2. Observe the scan tool Front Fog Lamps Relay Command parameter while turning the front fog lamps switch ON and OFF. The parameter should change between Active and Inactive. If the parameter does not change between the commanded states, refer to Fog Lamps Malfunction below.
  3. Command the Lamp Test ON and OFF with a scan tool. The fog lamps indicator should turn ON and OFF when changing between the commanded states. If the fog lamps indicator illuminates during the test, replace the BCM. If the fog lamps indicator does not illuminate during the test or remains illuminated at all times, replace the instrument cluster.

Fog Lamp Switch Malfunction

  1. Ignition OFF, disconnect the harness connector at the headlamp switch.
  2. Test for less than 5 ohms between the ground circuit terminal 8 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool Front Fog Lamp Switch parameter is Inactive. If not the specified value, test the signal circuit terminal 6 for a short to ground. If the circuit tests normal, replace the BCM.
  4. Install a 3 A fused jumper wire between the signal circuit terminal 6 and the ground circuit terminal 8. Verify the scan tool Front Fog Lamp Switch parameter is Active. If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the headlamp switch.

Fog Lamps Malfunction

  1. Ignition OFF, disconnect the fog lamp relay.
  2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 87 and ground. If the test lamp illuminates, test the control circuit for a short to voltage.
  3. Verify that a test lamp illuminates between the B+ circuit terminal 86 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the control circuit terminal 87 for a short to ground. If the circuit tests normal, test or replace the fog lamp relay.
  4. Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground. If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
  5. Disconnect the harness connector at the appropriate fog lamp - front.
  6. Test for less than 5 ohms between the ground circuit terminal B and ground If greater than the specified range, test the ground circuit for an open/high resistance.
  7. Connect the harness connector at the fog lamp - front.
  8. Connect a 15 A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87. Verify the fog lamp - front is activated. If the fog lamp - front does not activate and the circuit fuse is good, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the fog lamp - front. If the fog lamp - front does not activate and the circuit fuse is open, test the control circuit for a short to ground. If the circuit tests normal, test or replace the fog lamp - front.
  9. Connect a test lamp between the B+ circuit terminal 86 and the control circuit terminal 85.
  10. Command the Fog Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM. If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  11. If all circuits test normal, test or replace the fog lamp relay.

Component Testing

Headlamp Switch

  1. Ignition OFF, disconnect the harness connector at the headlamp switch.
  2. Test for infinite resistance between the signal terminal 6 and the ground terminal 8 with the switch in the open position. If not the specified value, replace the headlamp switch.
  3. Test for less than 2.0 ohms between the signal terminal 6 and the ground terminal 8 with the switch in the closed position. If greater than the specified range, replace the headlamp switch.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Headlamp Switch Replacement»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  2. «Relay Replacement (Within an Electrical Center)»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions__relay-replacement-within-an-electrical-center) , «Relay Replacement (Attached to Wire Harness)»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
  3. «Front Fog Lamp Replacement (Enclave)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Front Fog Lamp Replacement (Acadia)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  4. «Front Fog Lamp Bulb Replacement (Enclave)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Front Fog Lamp Bulb Replacement (Acadia)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  5. «Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM or IPC replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Rear Fog Lamp Relay Control211
Rear Fog Lamp Switch SignalB2540 0011
Headlamp Switch Ground1
Rear Fog Lamp Control112
Rear Fog Lamp Ground1
1. Rear Fog Lamps Inoperative 2. Rear Fog Lamps always ON

The body control module (BCM) controls the rear fog lamps based on inputs from the headlamp switch. When the rear fog lamp switch is pressed, a ground path is provided on the rear fog lamp switch signal circuit to the BCM, indicating the rear fog lamps ON command. In response to this signal, the BCM grounds the rear fog lamp relay control circuit energizing the Rear Fog Lamp Relay. With the rear fog lamp relay energized, battery voltage is applied through the RR FOG Fuse and the rear fog lamp control circuits illuminating the rear fog lamps.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON, observe the scan tool Rear Fog Lamp Switch parameter while pressing and releasing the rear fog lamp switch. The parameter should change between Active and Inactive. If the parameter does not change between the selected states, refer to the Rear Fog Lamp Switch Malfunction below.
  2. Ignition ON, command the Rear Fog Lamps ON and OFF with a scan tool. Verify the rear fog lamps turn on and off. If the front fog lamps are always on or always off, refer to Rear Fog Lamps Malfunction below.

Rear Fog Lamp Switch Malfunction

  1. Ignition OFF, disconnect the harness connector at the headlamp switch.
  2. Test for less than 5 ohms between the ground circuit terminal 8 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool Rear Fog Lamp Switch parameter is Inactive. If not the specified value, test the signal circuit terminal 10 for a short to ground. If the circuit tests normal, replace the BCM.
  4. Install a 3 A fused jumper wire between the signal circuit terminal 10 and the ground circuit terminal 8. Verify the scan tool Rear Fog Lamp Switch parameter is Active. If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the headlamp switch.

Rear Fog Lamps Malfunction

  1. Ignition OFF, disconnect the rear fog lamp relay.
  2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 87 and ground. If the test lamp illuminates, test the control circuit for a short to voltage.
  3. Verify that a test lamp illuminates between the B+ circuit terminal 86 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the control circuit terminal 87 for a short to ground. If the circuit tests normal, test or replace the fog lamp relay.
  4. Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground. If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
  5. Disconnect the harness connector at the appropriate fog lamp rear.
  6. Test for less than 5 ohms between the ground circuit terminal 2 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  7. Connect the harness connector at the fog lamp rear.
  8. Connect a 10 A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87. Verify the fog lamp rear is activated. If the fog lamp rear does not activate and the circuit fuse is good, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the fog lamp rear. If the fog lamp rear does not activate and the circuit fuse is open, test the control circuit for a short to ground. If the circuit tests normal, test or replace the fog lamp rear.
  9. Connect a test lamp between the B+ circuit terminal 86 and the control circuit terminal 85.
  10. Command the Rear Fog Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM. If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  11. If all circuits test normal, test or replace the rear fog lamp relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Relay Replacement (Within an Electrical Center)»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions__relay-replacement-within-an-electrical-center) , «Relay Replacement (Attached to Wire Harness)»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
  2. «Headlamp Switch Replacement»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  3. «Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Hazard Switch Signal112
Hazard Switch Ground1
1. Hazard Lamps Inoperative 2. Hazard Lamps Always On

The body control module (BCM) controls the hazard lamps based on inputs from the hazard switch. With the hazard switch closed, a ground path is provided on the hazard switch signal circuit, indicating a hazard lamp request. When this request is seen, the BCM will pulse the turn signal lamp control circuits, illuminating the turn signal lamps.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON, observe the scan tool Hazard Lamp Switch parameter while applying and releasing the hazard switch. The reading should change between Active and Inactive. If the parameter does not change between the commanded states, refer to Circuit/System Testing below.
  2. Observe the right and left turn signal lamps while applying and releasing the hazard lamp switch. The right and left turn signal lamps should flash ON and OFF while the hazard lamp switch is ON and remain OFF when the hazard lamp switch is OFF. If the turn signal lamps do not cycle between the selected states, refer to «Turn Signal Lamps and/or Indicators Malfunction»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) .
  3. Command the Lamp Test ON and OFF with a scan tool. The left and right turn signal indicators should turn ON and OFF when changing between the commanded states. If the left and right turn signal indicators illuminate during the test, replace the BCM. If the left and right turn signal indicators do not illuminate during the test or remain illuminated at all times, replace the instrument panel cluster.
  1. Ignition OFF, disconnect the harness connector at the hazard switch.
  2. Test for less than 5.0 ohms between the ground circuit terminal B and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool Hazard Lamp Switch parameter is Inactive. If not the specified value, test the signal circuit terminal C for a short to ground. If the circuit tests normal, replace the BCM.
  4. Install a 3 A fused jumper wire between the signal circuit terminal C and the ground circuit terminal B. Verify the scan tool Hazard Lamp Switch parameter is Active. If not the specified value, test the signal circuit for a short to voltage or and open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the hazard switch.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Hazard Warning Switch Replacement (Acadia)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Hazard Warning Switch Replacement (Enclave/Traverse)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  2. «Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM or instrument cluster replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure
  2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach
  3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Flash to Pass Switch Signal444
Headlamp Switch High Beam Signal444
Turn Signal/Multifunction Switch Ground4
Headlamp Switch Headlamps ON SignalB257A 0011
Headlamp Switch Headlamps OFF SignalB257A 0011
Headlamp Switch Ground1
Park Lamp Switch ON Signal5B257A 005
Headlamp High Beam Relay Control33B2580 00
Headlamp Low Beam Relay Control22B2575 00
High Beam Headlamp Control333
Low Beam Headlamp Control222
Headlamp Ground2
1. Headlamp Switch Malfunction 2. Headlamps Malfunction - Low Beam 3. Headlamps Malfunction - High Beam 4. Turn Signal/Multifunction Switch Malfunction 5. Park, License, and/or Tail Lamps Malfunction

With the headlamp switch in the ON position, the headlamp switch headlamp ON signal circuit is grounded through the headlamp switch. In response to this input, the body control module (BCM) provides ground to either the headlamp low beam relay control circuit or the headlamp high beam relay control circuit. The position of the turn signal/multifunction switch determines which relay coil is supplied with ground. The BCM supplies ground to the relay coil circuits, if the headlamps are necessary. The underhood fuse block supplies battery voltage to the relay coil and switch circuits. The low beam headlamps operate when the BCM grounds the relay coil control circuit to the relay coil of the low beam relay. This energizes the low beam relay causing the switch contacts to close. With the switch contacts closed, battery voltage is applied to the LT LO and RT LO beam fuses through to the left and right low beam headlamps. When the headlamp high beam relay coil is energized, current flows through the LT HI and the RT HI beam fuses to the high beam headlamps. With the turn signal/multifunction switch in the high beam position the BCM sends a serial data message to the instrument panel cluster (IPC) requesting the IPC to illuminate the high beam indicator.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON, observe the scan tool Auto Hdlp. Disable Sw. parameter while turning the headlamp switch ON and OFF. The parameter should change between Active and Inactive. If the reading does not change between the selected states, refer to Headlamp Switch Malfunction below.
  2. Observe the scan tool Headlamp Switch parameter while turning the headlamp switch ON and OFF. The parameter should change between Active and Inactive. If the reading does not change between the selected states, refer to Headlamp Switch Malfunction below.
  3. Observe the scan tool Flash To Pass Switch parameter while applying and releasing the flash to pass switch. The reading should change between Active and Inactive. If the reading does not change between the selected states, refer to Turn Signal/Multifunction Switch Malfunction below.
  4. Observe the scan tool High Beam Select switch parameter while applying and releasing the high beam select switch. The reading should change between Active and Inactive. If the reading does not change between the selected states, refer to Turn Signal/Multifunction Switch Malfunction below.
  5. Command the Low Beams ON and OFF with a scan tool. The low beam headlamps should turn ON and OFF when changing between the commanded states. If the low beam headlamps do not turn ON and OFF when commanded, refer to Headlamps Malfunction - Low Beam below.
  6. Command the High Beams ON and OFF with a scan tool. The high beam headlamps should turn ON and OFF when changing between the commanded states. If the high beam headlamps do not turn ON and OFF when commanded, refer to Headlamps Malfunction - High Beam below.
  7. Command the Lamp Test ON and OFF with a scan tool. The lights on indicator and high beam indicator should turn ON and OFF when changing between the commanded states. If the lights on indicator and high beam indicator illuminate during the test, replace the BCM. If the lights on indicator and high beam indicator do not illuminate during the test or remain illuminated at all times, replace the instrument cluster.
WARNINGThe high intensity discharge system produces high voltage and current. To reduce the risk of severe shocks and burns: Never open the high intensity discharge system ballast or the arc tube assembly starter. Never probe between the high intensity discharge system ballast output connector and the arc tube assembly.

Headlamp Switch Malfunction

  1. Ignition OFF, disconnect the harness connector at the headlamp switch.
  2. Ignition OFF, verify that a test lamp illuminates between B+ and the ground circuit terminal 8. If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
  3. Ignition ON, park lamps ON, verify the scan tool Headlamp Switch parameter is Inactive. If not the specified value, test the signal circuit terminal 1 for short to ground. If the circuit tests normal, replace the BCM.
  4. Verify the scan tool Auto Hdlp. Disable Sw. parameter is Inactive. If not the specified value, test the signal circuit terminal 3 for short to ground. If the circuit tests normal, replace the BCM.
  5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and ground. Verify the scan tool Headlamp Switch parameter is Active. If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  6. Install a 3 A fused jumper wire between the signal circuit terminal 3 and ground. Verify the scan tool Auto Hdlp. Disable Sw. parameter is Active. If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  7. If all circuits test normal, test or replace the headlamp switch.

Turn Signal/Multifunction Switch Malfunction

  1. Ignition OFF, disconnect the X2 harness connector at the turn signal/multifunction switch.
  2. Ignition OFF, verify that a test lamp illuminates between B+ and the ground circuit terminal 8. If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
  3. Verify the scan tool Flash to Pass Switch parameter is Inactive. If not the specified value, test the signal circuit terminal 10 for a short to ground. If the circuit tests normal, replace the BCM.
  4. Verify the scan tool High Beam Select Switch parameter is Inactive. If not the specified value, test the signal circuit terminal 7 for a short to ground. If the circuit tests normal, replace the BCM.
  5. Install a 3 A fused jumper wire between the signal circuit terminal 10 and ground. Verify the scan tool Flash to Pass Switch parameter is Active. If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  6. Install a 3 A fused jumper wire between the signal circuit terminal 7 and ground. Verify the scan tool High Beam Select Switch parameter is Active. If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  7. If all circuits test normal, test or replace the turn signal/multifunction switch.

Headlamps Malfunction - Low Beam

  1. Ignition OFF, disconnect the HID/LO BEAM relay.
  2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 87 and ground. If the test lamp illuminates, test the control circuit for a short to voltage.
  3. Verify that a test lamp illuminates between the B+ circuit terminal 85 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  4. Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground. If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
  5. Disconnect the harness connector at the appropriate headlamp - low beam.
  6. Test for less than 5 ohms between the appropriate ground circuit terminal listed below and ground: Without W49/TVD and with WDA/X88 - terminal A Without W49/TVD and with Z88 - terminal B With W49/TVD - terminal 6 If greater than the specified range, test the ground circuit for an open/high resistance.
  7. Connect the harness connector at the headlamp - low beam.
  8. Connect a 10 A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87. Verify the headlamp - low beam is activated. If the headlamp - low beam does not activate and the circuit fuse is good, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the appropriate headlamp - low beam. If the headlamp - low beam does not activate and the circuit fuse is open, test the control circuit for a short to ground. If the circuit tests normal, test or replace the appropriate headlamp - low beam.
  9. Connect a test lamp between the B+ circuit terminal 85 and the control circuit terminal 86.
  10. Command the Low Beams ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM. If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  11. If all circuits test normal, test or replace the HID/LO BEAM relay.

Headlamps Malfunction - High Beam

  1. Ignition OFF, disconnect the HI BEAM relay.
  2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 87 and ground. If the test lamp illuminates, test the control circuit for a short to voltage.
  3. Verify that a test lamp illuminates between the B+ circuit terminal 85 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  4. Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground. If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
  5. Disconnect the harness connector at the appropriate headlamp - high beam.
  6. Test for less than 5 ohms between the ground circuit terminal listed below and ground: Without W49/TVD - Terminal A With TVD/W49 - Terminal 1 With TVD/WDA - Terminal 3 With TVD/Z88 - Terminal I With TSH/T26 - Terminal E - Left With TSH/T26 - Terminal P - Right If greater than the specified range, test the ground circuit for an open/high resistance.
  7. Connect the harness connector at the headlamp - high beam.
  8. Connect a 20 A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87. Verify the headlamp - high beam is activated. If the headlamp - high beam does not activate and the circuit fuse is good, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the appropriate headlamp - high beam. If the headlamp - high beam does not activate and the circuit fuse is open, test the control circuit for short to ground. If the circuit tests normal, test or replace the appropriate headlamp - high beam.
  9. Connect a test lamp between the B+ circuit terminal 85 and the control circuit terminal 86.
  10. Command the High Beams ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM. If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  11. If all circuits test normal, test or replace the HI BEAM relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Headlamp Switch Replacement»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  2. «Headlamp Bulb Replacement (Traverse with TVP)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Headlamp Bulb Replacement (Low Beam without T96)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Headlamp Bulb Replacement (High Beam without T96)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  3. «Turn Signal Multifunction Switch Replacement»(/buick/enclave/i-2007-2013/remont/steering-column-switches/#steering-wheel-and-steering-column)
  4. «Headlamp Replacement (Acadia)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Headlamp Replacement (Traverse with TVP)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Headlamp Replacement (Enclave)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  5. «Relay Replacement (Within an Electrical Center)»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions__relay-replacement-within-an-electrical-center) , «Relay Replacement (Attached to Wire Harness)»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
  6. «Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM or IPC replacement, setup and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
I/P Dimming 12 V ReferenceB1395 03, B3600 03B1395 031, 2
Instrument Panel Lamps Dimmer Switch SignalB3600 03B3600 031, 2
Instrument Panel Lamp ControlB2652 0011
LED Dimming ControlB2610 0022
Headlamp Switch Ground3
1. Instrument Panel Lamps Malfunction 2. LED Malfunction 3. Headlamps and Dimmer Switch Malfunction

The body control module (BCM) supplies a voltage reference through the instrument panel (I/P) dimming 12 V reference circuit to the interior lamp dimmer switch, which is part of the headlamp switch. When the dimmer switch is placed in a desired brightness position, reference voltage is applied through the dimmer switch rheostat and the I/P lamps dimmer switch signal circuit to the BCM. The BCM interprets this voltage signal, then applies a pulse width modulated (PWM) voltage through the instrument panel lamp control circuit, the backlight lamp control circuit, and the LED dimming control circuit illuminating the LED and I/P panel lamps.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON, observe the scan tool Dimming Control Signal parameter while operating the dimmer switch from high to low. The reading should change from a high percent to a low percent as the switch is rotated. If the reading does not change, refer to Dimmer Switch Malfunction below.
  2. Command the Incandescent Dimming to change intensity with the scan tool. The appropriate incandescent lighting items should change in intensity. If any incandescent lighting items do not change in intensity, refer to Interior Backlighting Malfunction below.
  3. Command the LED Dimming to change intensity with the scan tool. The appropriate LED dimming items should change in intensity. If any LED lighting items do not change in intensity, refer to Interior Backlighting Malfunction below.

Dimmer Switch Malfunction

  1. Ignition OFF, disconnect the harness connector at the headlamp switch.
  2. Ignition OFF, verify that a test lamp illuminates between the ground circuit terminal 8 and B+. If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
  3. Ignition ON, test for 11.8-12.2 V between the 12 V reference circuit terminal 15 and ground. If greater than the specified range, test the 12 V reference circuit for a short to voltage. If the circuit tests normal, replace the BCM. If less than the specified range, test the 12 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  4. Ignition ON, verify the scan tool Dimming Control Signal parameter is less than 0.1 V. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the BCM.
  5. Install a 3 A fused jumper wire between the signal circuit terminal 13 and the voltage reference circuit terminal 15. Verify the scan tool Dimming Control Signal parameter is greater than 11.7 V. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  6. If all circuits test normal, test or replace the headlamp switch.

Interior Backlighting Malfunction

  1. Ignition OFF, disconnect the harness connector at any component with inoperative backlighting.
  2. Ignition OFF, scan tool disconnected, interior lamps OFF, doors CLOSED, test for less than 5 ohms between the ground circuit and ground. If greater than the specified value, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the control circuit terminal and ground.
  4. Command the Incandescent Dimming or LED Dimming ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the component with the inoperative backlighting.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Headlamp Switch Replacement»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  2. Refer to the appropriate replacement procedure for the lighting component that requires replacement.
  3. «Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM, HVAC, IPC, or Radio replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Park Lamp Relay Control21B2585 00
Park Lamp Switch On SignalB257A 0011
Park Lamp Control112
Park Lamp Ground1
Headlamp Switch Ground1
1. Park Lamps Inoperative 2. Park Lamps Always ON

The park, tail, marker, and license lamps are turned ON when the headlamp switch is placed in the PARK or ON position or anytime the headlights are requested. The underhood fuse block supplies B+ to both the park lamp relay switch contacts and the park lamp coil circuit. The body control module (BCM) provides a control circuit to the park lamp circuit. When the park lamps are requested ON, the BCM energizes the park lamp relay. Current flow is from the park lamp relay to the individual park lamp circuit fuses and to their respective park, tail, marker, and license lamps.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON, turn the park lamps ON and OFF using the headlamp switch. The scan tool Park Lamps Switch parameter should cycle between Active and Inactive when changing between the selected states. If the parameter does not cycle between the selected states, refer to Park Lamp Switch Malfunction below.
  2. Turn the park, license plate and tail lamps ON and OFF using the headlamp switch. The park, license plate and tail lamps should turn ON and OFF when changing between the selected states. If any park, license plate or tail lamp does not turn ON and OFF when changing between the selected states, refer to Park, License, and/or Tail Lamps Malfunction below.

Park Lamp Switch Malfunction

  1. Ignition OFF, disconnect the harness connector at the headlamp switch.
  2. Ignition OFF, verify that a test lamp illuminates between B+ and the ground circuit terminal 8. If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool Park Lamps Switch parameter is Inactive. If not the specified value, test the signal circuit terminal 2 for a short to ground. If the circuit tests normal, replace the BCM.
  4. Install a 3 A fused jumper wire between the signal circuit terminal 2 and ground. Verify the scan tool Park Lamps Switch parameter is Active. If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the headlamp switch.

Park, License, and/or Tail Lamps Malfunction

  1. Ignition OFF, disconnect the PRK LAMP relay.
  2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 87 and ground. If the test lamp illuminates, test the control circuit for a short to voltage.
  3. Verify that a test lamp illuminates between the B+ circuit terminal 85 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  4. Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground. If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
  5. Disconnect the harness connector at the appropriate park lamp.
  6. Test for less than 5 ohms between the ground circuit terminal and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  7. Connect the harness connector at the park lamp.
  8. Connect a 10 A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87. Verify the park lamp is activated. If the park lamp does not activate and the circuit fuse is good, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the park lamp. If the park lamp does not activate and the circuit fuse is open, test the control circuit for a short to ground. If the circuit tests normal, test or replace the park lamp.
  9. Connect a test lamp between the B+ circuit terminal 85 and the control circuit terminal 86.
  10. Command the Parking Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM. If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  11. If all circuits test normal, test or replace the PRK LAMP relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Relay Replacement (Within an Electrical Center)»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions__relay-replacement-within-an-electrical-center) , «Relay Replacement (Attached to Wire Harness)»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
  2. «Headlamp Switch Replacement»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  3. Refer to the appropriate replacement procedure for the lighting component that requires replacement.
  4. «Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Brake Position Sensor 5 V ReferenceC0277 06, C0890 03C0277 06C0277 06, C0890 07
Stop Lamp Switch SignalC0277 06C0277 06C0277 07C0277 09, C0277 4B
Brake Position Sensor Low ReferenceC0277 06
CHMSL ControlB3445 0034
Center High Mounted Stop Lamp (CHMSL) Ground3
Stop Lamp Control112
Stop/Turn Lamp Ground1
1. Stop/Turn Lamp Inoperative 2. Stop/Turn Lamp Always ON 3. Center High Mounted Stop Lamp Inoperative 4. Center High Mounted Stop Lamp Always ON

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 B+ to the stop lamps, center high mounted stop lamp (CHMSL), transmission control module (TCM), and engine control module (ECM). The stop lamps will not operate unless the ignition is in the ON position.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON, observe the scan tool BPP Sensor parameter while applying and releasing the brake pedal. The parameter should change between low counts and high counts when changing between the selected states. If the parameter does not change between the selected states, refer to the Brake Pedal Position Sensor Malfunction below.
  2. Observe the left and right stop lamps while pressing and releasing the brake pedal. The stop lamps should turn ON and OFF when changing between the selected states. If the left or right stop lamps do not change between the selected states, refer to the Stop Lamp Malfunction below.
  3. Observe the center high mount stop lamp while pressing and releasing the brake pedal. The center high mount stop lamp should turn ON and OFF when changing between the selected states. If the center high mount stop lamp does not change between the selected states, refer to Center High Mount Stop Lamp Malfunction below.

Brake Pedal Position Sensor Malfunction

  1. Ignition OFF, disconnect the harness connector at the brake pedal position sensor.
  2. Ignition OFF, test for less than 5 ohms between the low reference circuit terminal C and ground. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the BCM.
  3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal A and ground. If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM. If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the BCM.
  4. Test for less than 0.3 V between the signal circuit terminal B and ground. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the BCM.
  5. Test for 4.8-5.2 V between the 5 V reference circuit terminal A and the signal circuit terminal B. If less than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the BCM.
  6. If all circuits test normal, test or replace the brake pedal position sensor.

Stop Lamp Malfunction

  1. Ignition OFF, disconnect the harness connector at the appropriate tail lamp.
  2. Test for less than 5.0 ohms between the ground circuit terminal listed below and ground: With RPO Z88 - terminal D Without RPO Z88 - terminal B If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the control circuit terminal listed below and ground: With RPO Z88 - terminal E Without RPO Z88 - terminal A
  4. Ignition ON, press and release the brake pedal. The test lamp should turn ON and OFF when changing between the selected states. If the test lamp is always ON, test the control circuit for a short to voltage. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance.
  5. If all circuits test normal, test or replace the tail lamp.

Center High Mount Stop Lamp Malfunction

  1. Ignition OFF, disconnect the harness connector at the center high mounted stop lamp.
  2. Test for less than 5 ohms between the ground circuit terminal 1 and ground. If greater than the specified value, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the control circuit terminal 2 and ground.
  4. Ignition ON, press and release the brake pedal. The test lamp should turn ON and OFF when changing between the selected states. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the center high mounted stop lamp.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Brake Pedal Position Sensor Replacement»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system__brake-pedal-position-sensor-replacement)
  2. «High Mount Stop Lamp Replacement (Acadia)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «High Mount Stop Lamp Replacement (Traverse)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «High Mount Stop Lamp Replacement (Enclave)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  3. «Tail Lamp Replacement (Enclave)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system__tail-lamp-replacement-enclave) , «Tail Lamp Replacement (Acadia)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Tail Lamp Replacement (Traverse)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  4. «Tail Lamp Bulb Replacement (Acadia)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Tail Lamp Bulb Replacement (Traverse)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Tail Lamp Bulb Replacement (Enclave)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system__tail-lamp-bulb-replacement-enclave)
  5. «Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach
  3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Front Turn Signal Lamp Control222
Front Park/Turn Signal Lamp Ground2
Rear Stop/Turn Lamp Control333
Tail/Stop and Turn Signal Lamp Ground3
Outside Rearview Mirror Turn Signal Control444
Outside Rearview Mirror Turn Signal Ground4
Left Turn Signal Switch Signal111
Right Turn Signal Switch Signal111
Turn Signal/Multifunction Switch Ground1
1. Turn Signals Malfunction 2. Front Turn Signal Malfunction 3. Rear Turn Signal Malfunction 4. Outside Rearview Mirror Turn Signal Malfunction

The body control module (BCM) controls the vehicle turn signals based on inputs from the turn signal/multifunction switch. With the turn signal/multifunction switch in the left turn position, a ground path is provided on the left turn signal switch signal circuit, indicating a left turn signal request. With the turn signal/multifunction switch in the right turn position, a ground path is provided on the right turn signal switch signal circuit, indicating a right turn signal request. When the specific request is seen, the BCM will pulse the respective turn signal lamp control circuits, illuminating the turn signal lamps.

When a turn signal request is seen by the BCM, a serial data message is sent to the instrument panel cluster (IPC) requesting the respective turn signal indicator be pulsed.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON, observe the scan tool Right Turn Signal Switch and Left Turn Signal Switch parameters while cycling the turn signal switch between the right and left positions. The parameters should change between Active and Inactive when changing between the selected states. If the parameters do not change between the selected states, refer to Turn Signal Switch Malfunction below.
  2. Ignition ON, observe the right and left turn signal lamps while cycling the turn signal switch between the right and left positions. The turn signal lamps turn ON and OFF when changing between the selected states. If the turn signal lamps do not change between the selected states, refer to Turn Signal Lamps Malfunction below.
  3. Command the All Indicators Test ON and OFF with a scan tool. The left and right turn signal indicators should turn ON and OFF when changing between the commanded states. If the left and right turn signal indicators illuminate during the test, replace the BCM. If the left and right turn signal indicators do not illuminate during the test or remain illuminated at all times, replace the instrument cluster.

Turn Signal Switch Malfunction

  1. Ignition OFF, disconnect the X1 harness connector at the turn signal/multi-function switch.
  2. Test for less than 5 ohms between the ground circuit terminal 1 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool Left Turn Signal Switch parameter is Inactive. If not the specified value, test the signal circuit terminal 2 for a short to ground. If the circuit tests normal, replace the BCM.
  4. Verify the scan tool Right Turn Signal Switch parameter is Inactive. If not the specified value, test the signal circuit terminal 3 for a short to ground. If the circuit tests normal, replace the BCM.
  5. Install a 3 A fused jumper wire between the signal circuit terminal 2 and ground. Verify the scan tool Left Turn Signal Switch parameter is Active. If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  6. Install a 3 A fused jumper wire between the signal circuit terminal 3 and ground. Verify the scan tool Right Turn Signal Switch parameter is Active. If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  7. If all circuits test normal, test or replace the turn signal/multi-function switch.

Turn Signal Lamps Malfunction

  1. Ignition OFF, disconnect the harness connector at the appropriate turn signal lamp.
  2. Test for less than 5.0 ohms between the ground circuit terminal listed below and ground. Park/turn signal lamp - terminal B Turn signal lamp - front - terminal 2 (WDA) Turn signal lamp - front - terminal 1 (W49/Z88) Turn signal lamp - lower front - terminal 2 Outside rearview mirror lamp - terminal 10 Tail lamp - terminal D Tail/stop and turn signal lamp - terminal B If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the control circuit terminal listed below and ground. Park/turn signal lamp - terminal A Turn signal lamp - front - terminal 1 (WDA) Turn signal lamp - front - terminal 2 (W49/Z88) Turn signal lamp - lower front - terminal 1 Outside rearview mirror lamp - terminal 5 Tail lamp - terminal E Tail/stop and turn signal lamp - terminal A
  4. Command the appropriate Turn Signal ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, replace the turn signal lamp.

Turn Signal/Multifunction Switch

  1. Ignition OFF, disconnect the harness connector X1 at the turn signal/multifunction switch.
  2. Test for infinite resistance between the following terminals and the ground circuit terminal 1 with the switch in the neutral position. Signal terminal 2 Signal terminal 3 If not the specified value, replace the turn signal/multifunction switch.
  3. Test for less than 2.0 ohms between the signal circuit terminal 2 and the ground circuit terminal E with the switch in the left turn position. If greater than the specified range, replace the turn signal/multifunction switch.
  4. Test for less than 2.0 ohms between the signal circuit terminal 3 and the ground circuit terminal E with the switch in the left turn position. If greater than the specified range, replace the turn signal/multifunction switch.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Turn Signal Multifunction Switch Replacement»(/buick/enclave/i-2007-2013/remont/steering-column-switches/#steering-wheel-and-steering-column)
  2. «Headlamp Replacement (Acadia)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Headlamp Replacement (Traverse with TVP)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Headlamp Replacement (Enclave)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  3. «Parking and Turn Signal Lamp Replacement (Traverse)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  4. «Parking and Turn Signal Lamp Bulb Replacement (Acadia)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Parking and Turn Signal Lamp Bulb Replacement (Enclave)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Parking and Turn Signal Lamp Bulb Replacement (Traverse)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  5. «Tail Lamp Replacement (Enclave)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system__tail-lamp-replacement-enclave) , «Tail Lamp Replacement (Acadia)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Tail Lamp Replacement (Traverse)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)
  6. «Tail Lamp Bulb Replacement (Acadia)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Tail Lamp Bulb Replacement (Traverse)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system) , «Tail Lamp Bulb Replacement (Enclave)»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system__tail-lamp-bulb-replacement-enclave)
  7. «Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM and IPC replacement, programming and setup

Brake Pedal Position Sensor Calibration

Note. Brake system does not use a brake switch, stoplight switch or brakelight switch. System uses a Brake Pedal Position Sensor to control these functions.

Calibration Criteria

IMPORTANTDo not apply the brake pedal during the brake pedal position sensor calibration procedure. Any movement of the brake pedal during this procedure will cause the calibration procedure to fail. If this occurs, the brake pedal position sensor (BPPS) calibration must be repeated.

Brake pedal position sensor calibration must be performed after the brake pedal position sensor or body control module (BCM) have been serviced. The calibration procedure will set the brake pedal position sensor home value. This value is used by the BCM to determine the action of the driver applying the brake system and to provide this information to the vehicle subsystems via the GMLAN communication bus.

Calibration Procedure

  1. Apply the parking brake.
  2. Place the transmission in the PARK position.
  3. Install a scan tool.
  4. Clear all BCM DTCs before proceeding.
  5. Navigate to the Vehicle Control Systems menu.
  6. Select Module Setup menu item.
  7. Select BCM menu item.
  8. Select the BPP Sensor Calibration procedure and follow the directions displayed on the screen.

Brake Pedal Position Sensor Replacement

Note. Brake system does not use a brake switch, stoplight switch or brakelight switch. System uses a Brake Pedal Position Sensor to control these functions.

Scheme 22

Scheme 22: Brake Pedal Position Sensor Replacement
Scheme 22: Brake Pedal Position Sensor Replacement
CalloutComponent Name
Preliminary Procedure Remove the left instrument panel insulator panel. Refer to Instrument Panel Insulator Panel Replacement - Left Side (Enclave) , Instrument Panel Insulator Panel Replacement - Left Side (Acadia) , Instrument Panel Insulator Panel Replacement - Left Side (Traverse) .
1Brake Pedal Position Sensor Bolt CAUTION: Refer to Fastener Caution . Tighten 3 N.m (27 lb in)
2Brake Pedal Position Sensor Procedure Disconnect the brake pedal position sensor electrical connector. After the installation is complete, calibrate the brake pedal position sensor. Refer to Brake Pedal Position Sensor Calibration .
CAUTION
Refer to Fastener Caution .

Brake Pedal Position Sensor Replacement

Scheme 23

Scheme 23: Headlamp Switch Replacement
Scheme 23: Headlamp Switch Replacement
CalloutComponent Name
Preliminary Procedure Remove the driver knee bolster. Refer to Driver Knee Bolster Replacement (Acadia) , Driver Knee Bolster Replacement (Traverse) , Driver Knee Bolster Replacement (Enclave) .
1Headlamp Switch Assembly

Headlamp Switch Replacement

Fog Lamp Switch Replacement

CalloutComponent Name
Preliminary Procedure Remove the driver knee bolster. Refer to Driver Knee Bolster Replacement (Acadia) , Driver Knee Bolster Replacement (Traverse) , Driver Knee Bolster Replacement (Enclave) .
1Headlamp Switch Assembly

Fog Lamp Switch Replacement

Scheme 24

Scheme 24: Hazard Warning Switch Replacement (Enclave/Traverse)
Scheme 24: Hazard Warning Switch Replacement (Enclave/Traverse)
CalloutComponent Name
Preliminary Procedure Remove the instrument panel accessory trim plate. Refer to Instrument Panel Accessory Trim Plate Replacement (Enclave) , Instrument Panel Accessory Trim Plate Replacement (Traverse) .
1Hazard Warning Switch Assembly Procedure Release tab on top and bottom of switch to remove. Disconnect Electrical Connector.

Hazard Warning Switch Replacement (Enclave/Traverse)

Scheme 25

Scheme 25: Hazard Warning Switch Replacement (Acadia)
Scheme 25: Hazard Warning Switch Replacement (Acadia)
CalloutComponent Name
Preliminary Procedure Remove the instrument panel accessory trim plate. Refer to Instrument Panel Accessory Trim Plate Replacement (Acadia) .
1Hazard Warning Switch Assembly Procedure Disconnect the electrical connector.

Hazard Warning Switch Replacement (Acadia)

Scheme 26

Scheme 26: Daytime Running Lamp (DRL) Ambient Light Sensor Replacement (Without UV6)
Scheme 26: Daytime Running Lamp (DRL) Ambient Light Sensor Replacement (Without UV6)
CalloutComponent Name
1Instrument Panel Upper Trim Panel Refer to Instrument Panel Upper Trim Panel with Windshield Defroster Nozzle Grille Replacement (Traverse) , Instrument Panel Upper Trim Panel with Windshield Defroster Nozzle Grille Replacement (Enclave) , Instrument Panel Upper Trim Panel with Windshield Defroster Nozzle Grille Replacement (Acadia w/o RPO UV6) .
2Headlamp Auto Control Ambient Light Sensor Assembly Procedure Twist and pull down to remove. Disconnect electrical connector.

Daytime Running Lamp (DRL) Ambient Light Sensor Replacement (Without UV6)

Scheme 27

Scheme 27: Daytime Running Lamp (DRL) Ambient Light Sensor Replacement (With UV6)
Scheme 27: Daytime Running Lamp (DRL) Ambient Light Sensor Replacement (With UV6)
CalloutComponent Name
1Instrument Panel Upper Trim Panel Refer to Instrument Panel Upper Trim Panel with Windshield Defroster Nozzle Grille Replacement (Acadia w/RPO UV6) , Instrument Panel Upper Trim Panel with Windshield Defroster Nozzle Grille Replacement (Traverse) , Instrument Panel Upper Trim Panel with Windshield Defroster Nozzle Grille Replacement (Enclave) .
2Headlamp Auto Control Ambient Light Sensor Assembly Procedure Twist and pull down to remove. Disconnect electrical connector.

Daytime Running Lamp (DRL) Ambient Light Sensor Replacement (With UV6)

Scheme 28

Scheme 28: Reading Lamp Bulb Replacement
Scheme 28: Reading Lamp Bulb Replacement
CalloutComponent Name
Preliminary Procedure Remove the reading lamp assembly. Refer to Reading Lamp Replacement .
1Dome Lamp Housing Screw (Qty: 3) CAUTION: Refer to Fastener Caution . Tighten 2 N.m(18 lb in)
2Dome Lamp Housing
3Dome Reading Reflector (Qty: 2)
4Reading Lamp Bulb (Qty: 2)
CAUTION
Refer to Fastener Caution .

Reading Lamp Bulb Replacement

Scheme 29

Scheme 29: Reading Lamp Replacement
Scheme 29: Reading Lamp Replacement
CalloutComponent Name
1Reading Lamp Assembly Procedure Carefully use a plastic flat bladed tool, and release the clips retaining the reading lamp assembly to the headliner. Grasp the reading lamp assembly and pull downward to disengage the retainers securing the reading lamp assembly to the vehicle. Disconnect the electrical connectors.

Reading Lamp Replacement

Scheme 30

Scheme 30: Instrument Panel Courtesy Lamp Bulb Replacement - Left Side
Scheme 30: Instrument Panel Courtesy Lamp Bulb Replacement - Left Side
CalloutComponent Name
Preliminary Procedure Remove the instrument panel insulator panel. Refer to Instrument Panel Insulator Panel Replacement - Left Side (Enclave) , Instrument Panel Insulator Panel Replacement - Left Side (Acadia) , Instrument Panel Insulator Panel Replacement - Left Side (Traverse) .
1Courtesy Lamp Assembly Procedure Carefully twist to release the bulb assembly.

Instrument Panel Courtesy Lamp Bulb Replacement - Left Side

Scheme 31

Scheme 31: Instrument Panel Courtesy Lamp Bulb Replacement - Right Side
Scheme 31: Instrument Panel Courtesy Lamp Bulb Replacement - Right Side
CalloutComponent Name
Preliminary Procedure Remove the instrument panel insulator panel. Refer to Instrument Panel Insulator Panel Replacement - Right Side (Traverse) , Instrument Panel Insulator Panel Replacement - Right Side (Acadia) , Instrument Panel Insulator Panel Replacement - Right Side (Enclave) .
1Courtesy Lamp Assembly Procedure Carefully twist to release the bulb assembly.

Instrument Panel Courtesy Lamp Bulb Replacement - Right Side

Scheme 32

Scheme 32: Sunshade Illuminated Mirror Lamp Bulb Replacement
Scheme 32: Sunshade Illuminated Mirror Lamp Bulb Replacement
CalloutComponent Name
1Sunshade Illuminated Mirror Lamp Lens Procedure Carefully use a flat bladed tool, and release the tabs retaining the lamp lens to the sunshade assembly.
2Sunshade Illuminated Mirror Lamp Bulb

Sunshade Illuminated Mirror Lamp Bulb Replacement

Scheme 33

Scheme 33: Outside Rearview Mirror Turn Signal Lamp Replacement (Except Enclave)
Scheme 33: Outside Rearview Mirror Turn Signal Lamp Replacement (Except Enclave)
CalloutComponent Name
Preliminary Procedure Remove the outside rear view mirror glass. Refer to Outside Rearview Mirror Glass Replacement .
1Outside Rearview Mirror Turn Signal Lamp Screw (Qty: 2)
2Outside Rearview Mirror Turn Signal Lamp Assembly Procedure Disconnect the electrical connector. Slide the turn signal assembly downward from the outside rearview mirror mounting holes. Remove the outside rearview mirror turn signal lamp from the mirror assembly housing.

Outside Rearview Mirror Turn Signal Lamp Replacement (Except Enclave)

Scheme 34

Scheme 34: Headlamp Replacement (Traverse with TVP)
Scheme 34: Headlamp Replacement (Traverse with TVP)
CalloutComponent Name
Preliminary Procedure Remove the front bumper fascia. Refer to Front Bumper Fascia Replacement (Traverse) .
1Fender Brace Bolt to Headlamp CAUTION: Refer to Fastener Caution . Tighten 2 N.m (18 lb in)
2Headlamp Bolt Tighten 6 N.m (53 lb in)
3Headlamp Horizontal and Vertical Adjusting Cam Nut Bolt (Qty: 2) Procedure Set the cam adjusting nuts to the nominal setting of 6 turns off fully seated prior to installing the new headlamp assembly. Check the front bumper fascia to headlamp finish fit and adjust the cam nuts accordingly to achieve an even fit.
4Headlamp Assembly WARNING: Refer to Halogen Bulb Warning . Procedure Gently pull forward the headlamp assembly. Disconnect the forward lamp harness electrical connector from the headlamp assembly electrical connector. Remove the headlamp from vehicle. Transfer the headlamp electrical harness with bulb sockets as needed. Aim the headlamps. Refer to Headlamp Aiming .
CAUTION
Refer to Fastener Caution .
WARNING
Refer to Halogen Bulb Warning .

Headlamp Replacement (Traverse with TVP)

Scheme 35

Scheme 35: Headlamp Replacement (Acadia)
Scheme 35: Headlamp Replacement (Acadia)
CalloutComponent Name
Preliminary Procedure Remove the front bumper fascia. Refer to Front Bumper Fascia Replacement (Acadia) .
1Headlamp Screws (Qty: 4) CAUTION: Refer to Fastener Caution . Tighten 6 N.m (53 lb in)
2Fender Brace Screw to Headlamp Tighten 2 N.m (18 lb in)
3Headlamp Horizontal and Vertical Adjustment Nuts (Qty: 2) Procedure Set the cam adjusting nuts to the nominal setting of 6 turns off fully seated prior to installing the new headlamp assembly. Check the front bumper fascia to headlamp finish fit and adjust the cam nuts accordingly to achieve an even fit.
4Headlamp Vertical Adjusting Bolt Bushing
5Headlamp Assembly Procedure Gently pull forward the headlamp assembly. Disconnect the forward lamp harness from the headlamp assembly electrical connector. Remove the headlamp from vehicle.
CAUTION
Refer to Fastener Caution .

Headlamp Replacement (Acadia)

Scheme 36

Scheme 36: Headlamp Replacement (Enclave)
Scheme 36: Headlamp Replacement (Enclave)
CalloutComponent Name
Preliminary Procedure Remove the front bumper fascia. Refer to Front Bumper Fascia Replacement (Enclave) .
1Headlamp Bolt (Qty: 4) CAUTION: Refer to Fastener Caution . Tighten 6 N.m (53 lb in)
2Fender Brace Bolt to Headlamp Tighten 2 N.m (18 lb in)
3Headlamp Horizontal and Vertical Adjustment Nuts (Qty: 2) Procedure Set the cam adjusting nuts to the nominal setting of 6 turns off fully seated prior to installing the new assembly. Check the front bumper fascia to headlamp finish fit and adjust the cam nuts accordingly to achieve an even fit.
4Headlamp Vertical Adjusting Bolt Bushing
5Headlamp Assembly Procedure Gently pull forward the headlamp assembly. Disconnect the forward lamp harness from the headlamp assembly electrical connector. Remove the headlamp from vehicle.
CAUTION
Refer to Fastener Caution .

Headlamp Replacement (Enclave)

Scheme 37

Scheme 37: High Intensity Discharge Headlamp Starter/Arc Tube Replacement (Enclave TVC TSH)
Scheme 37: High Intensity Discharge Headlamp Starter/Arc Tube Replacement (Enclave TVC TSH)
CalloutComponent Name
WARNING: The high intensity discharge system produces high voltage and current. In order to reduce the risk of severe shocks and burns, the battery negative cable must be disconnected any time service work is being performed on or around the high intensity discharge system. WARNING: The high intensity discharge system produces high voltage and current. To reduce the risk of severe shocks and burns: Never open the high intensity discharge system ballast or the arc tube assembly starter. Never probe between the high intensity discharge system ballast output connector and the arc tube assembly. Preliminary Procedure Remove the headlamp assembly. Refer to Headlamp Capsule Replacement (Enclave TVC TSH) .
1Headlamp Bulb and Ballast Locking Ring Procedure Shown in the locked position, using your 2 fingers, rotate the locking ring counter-clockwise to unlock the bulb and ballast.
2Headlamp Bulb and Ballast Locking Ring Procedure Position and secure the electrical wire harness connector to the headlamp bulb and ballast. Position and secure the headlamp ballast and bulb assembly to the headlamp. Rotate the locking ring in a clockwise position in order to secure the ballast and bulb assembly to the headlamp capsule.
WARNING
The high intensity discharge system produces high voltage and current. In order to reduce the risk of severe shocks and burns, the battery negative cable must be disconnected any time service work is being performed on or around the high intensity discharge system.
WARNING
The high intensity discharge system produces high voltage and current. To reduce the risk of severe shocks and burns: Never open the high intensity discharge system ballast or the arc tube assembly starter. Never probe between the high intensity discharge system ballast output connector and the arc tube assembly.

High Intensity Discharge Headlamp Starter/Arc Tube Replacement (Enclave TVC TSH)

Scheme 38

Scheme 38: Headlamp Ballast Replacement (Acadia TVD)
Scheme 38: Headlamp Ballast Replacement (Acadia TVD)
CalloutComponent Name
WARNING: The high intensity discharge system produces high voltage and current. To reduce the risk of severe shocks and burns: Never open the high intensity discharge system ballast or the arc tube assembly starter. Never probe between the high intensity discharge system ballast output connector and the arc tube assembly. Preliminary Procedure Remove the wheelhouse liner. Refer to Front Wheelhouse Front Liner Replacement (Enclave - Acadia) .
1Headlamp Ballast Assembly Screws (Qty: 2) CAUTION: Refer to Fastener Caution . Tighten 3 N.m (27 lb in)
2Headlamp Ballast Assembly Procedure Disconnect the electrical connector. Slide the ballast rearward from the headlamp composite assembly.
WARNING
The high intensity discharge system produces high voltage and current. To reduce the risk of severe shocks and burns: Never open the high intensity discharge system ballast or the arc tube assembly starter. Never probe between the high intensity discharge system ballast output connector and the arc tube assembly.
CAUTION
Refer to Fastener Caution .

Headlamp Ballast Replacement (Acadia TVD)

Scheme 39

Scheme 39: Headlamp Ballast Replacement (Enclave TVC TSH)
Scheme 39: Headlamp Ballast Replacement (Enclave TVC TSH)
CalloutComponent Name
WARNING: The high intensity discharge system produces high voltage and current. To reduce the risk of severe shocks and burns: Never open the high intensity discharge system ballast or the arc tube assembly starter. Never probe between the high intensity discharge system ballast output connector and the arc tube assembly. Preliminary Procedure Remove the wheelhouse liner. Refer to Front Wheelhouse Front Liner Replacement (Enclave - Acadia) .
1Headlamp Ballast Assembly Screw (Qty: 2) CAUTION: Refer to Fastener Caution . Tighten 3 N.m (27 lb in)
2Headlamp Ballast Assembly Procedure Disconnect the electrical connector. Slide the ballast rearward from the headlamp composite assembly.
WARNING
The high intensity discharge system produces high voltage and current. To reduce the risk of severe shocks and burns: Never open the high intensity discharge system ballast or the arc tube assembly starter. Never probe between the high intensity discharge system ballast output connector and the arc tube assembly.
CAUTION
Refer to Fastener Caution .

Headlamp Ballast Replacement (Enclave TVC TSH)

Scheme 40

Scheme 40: Headlamp Bulb Replacement (Traverse with TVP)
Scheme 40: Headlamp Bulb Replacement (Traverse with TVP)
CalloutComponent Name
Preliminary Procedure Remove the front wheelhouse front liner. Refer to Front Wheelhouse Front Liner Replacement (Traverse) .
1Headlamp Bulb Accessory Cover (Qty: 2) TIP: Rotate counterclockwise the accessory covers and remove.
2Headlamp Bulb Low Beam / DRL Bulb WARNING: Refer to Halogen Bulb Warning . TIP: Disconnect the electrical connector in order to remove the low beam / DRL bulb.
3Headlamp Bulb High Beam TIP: Disconnect the electrical connector in order to remove the high beam headlamp bulb.
WARNING
Refer to Halogen Bulb Warning .

Headlamp Bulb Replacement (Traverse with TVP)

Scheme 41

Scheme 41: Headlamp Bulb Replacement (High Beam without T96)
Scheme 41: Headlamp Bulb Replacement (High Beam without T96)
CalloutComponent Name
Preliminary Procedure Remove the front wheelhouse liner. Refer to Front Wheelhouse Front Liner Replacement (Enclave - Acadia) , Front Wheelhouse Front Liner Replacement (Traverse) .
1Headlamp Bulb Accessory Cover TIP: Rotate the cover counterclockwise and remove.
2Headlamp Bulb (High Beam) WARNING: Refer to Halogen Bulb Warning . Procedure Disconnect the electrical connector from the bulb socket. Disconnect the bulb socket from the headlamp assembly. Discard the bulb.
WARNING
Refer to Halogen Bulb Warning .

Headlamp Bulb Replacement (High Beam without T96)

Scheme 42

Scheme 42: Headlamp Bulb Replacement (Low Beam without T96)
Scheme 42: Headlamp Bulb Replacement (Low Beam without T96)
CalloutComponent Name
Preliminary Procedure Remove the front wheelhouse liner. Refer to Front Wheelhouse Front Liner Replacement (Enclave - Acadia) , Front Wheelhouse Front Liner Replacement (Traverse) .
1Headlamp Bulb Accessory Cover TIP: Rotate the cover counterclockwise and remove.
2Headlamp Bulb (Low Beam) WARNING: Refer to Halogen Bulb Warning . Procedure Disconnect the electrical connector from the bulb socket. Release the bulb from the headlamp assembly. Discard the bulb.
WARNING
Refer to Halogen Bulb Warning .

Headlamp Bulb Replacement (Low Beam without T96)

Headlamp Capsule Replacement (Acadia TVD)

CalloutComponent Name
WARNING: The high intensity discharge system produces high voltage and current. In order to reduce the risk of severe shocks and burns, the battery negative cable must be disconnected any time service work is being performed on or around the high intensity discharge system. WARNING: The high intensity discharge system produces high voltage and current. To reduce the risk of severe shocks and burns: Never open the high intensity discharge system ballast or the arc tube assembly starter. Never probe between the high intensity discharge system ballast output connector and the arc tube assembly. Preliminary Procedure Remove the front bumper fascia. Refer to Front Bumper Fascia Replacement (Acadia) .
1Headlamp Assembly Bolts (Qty: 4) CAUTION: Refer to Fastener Caution . Tighten 6 N.m (53 lb in)
2Fender Brace to Headlamp Screw Tighten 2 N.m (18 lb in)
3Headlamp Horizontal and Vertical Adjustment Nuts Procedure Set the cam adjusting nuts to the nominal setting of 6 turns off fully seated prior to installing the new headlamp assembly. Check the front bumper fascia to headlamp finish fit and adjust the cam nuts accordingly to achieve an even fit.
4Headlamp Vertical Adjuster Bolt Bushing
5Headlamp Capsule Assembly Procedure Gently pull forward the headlamp capsule assembly. Disconnect the forward lamp harness electrical connector from the headlamp. Remove the headlamp capsule from the vehicle.
WARNING
The high intensity discharge system produces high voltage and current. In order to reduce the risk of severe shocks and burns, the battery negative cable must be disconnected any time service work is being performed on or around the high intensity discharge system.
WARNING
The high intensity discharge system produces high voltage and current. To reduce the risk of severe shocks and burns: Never open the high intensity discharge system ballast or the arc tube assembly starter. Never probe between the high intensity discharge system ballast output connector and the arc tube assembly.
CAUTION
Refer to Fastener Caution .

Headlamp Capsule Replacement (Acadia TVD)

Headlamp Capsule Replacement (Enclave TVC TSH)

CalloutComponent Name
WARNING: The high intensity discharge system produces high voltage and current. In order to reduce the risk of severe shocks and burns, the battery negative cable must be disconnected any time service work is being performed on or around the high intensity discharge system. WARNING: The high intensity discharge system produces high voltage and current. To reduce the risk of severe shocks and burns: Never open the high intensity discharge system ballast or the arc tube assembly starter. Never probe between the high intensity discharge system ballast output connector and the arc tube assembly. Preliminary Procedure Remove the front bumper fascia. Refer to Front Bumper Fascia Replacement (Enclave) .
1Headlamp Assembly Bolts (Qty: 4) CAUTION: Refer to Fastener Caution . Tighten 6 N.m (53 lb in)
2Fender Brace to Headlamp Screw Tighten 2 N.m (18 lb in)
3Headlamp Horizontal and Vertical Adjustment Nuts Procedure Set the cam adjusting nuts to the nominal setting of 6 turns off fully seated prior to installing the new headlamp assembly. Check the front bumper fascia to headlamp finish fit and adjust the cam nuts accordingly to achieve an even fit.
4Headlamp Vertical Adjuster Bolt Bushing
5Headlamp Capsule Assembly Procedure Gently pull forward the headlamp capsule assembly. Disconnect the forward lamp harness electrical connector from the headlamp. Remove the headlamp capsule from the vehicle.
WARNING
The high intensity discharge system produces high voltage and current. In order to reduce the risk of severe shocks and burns, the battery negative cable must be disconnected any time service work is being performed on or around the high intensity discharge system.
WARNING
The high intensity discharge system produces high voltage and current. To reduce the risk of severe shocks and burns: Never open the high intensity discharge system ballast or the arc tube assembly starter. Never probe between the high intensity discharge system ballast output connector and the arc tube assembly.
CAUTION
Refer to Fastener Caution .

Headlamp Capsule Replacement (Enclave TVC TSH)

Headlamp Aiming

The vehicle has a visual optical headlamp aiming system. The aim has been preset at the factory and should need no further adjustment

However, If the vehicle is damaged in an accident, the headlamp aim may be affected and adjustment may be necessary.

If oncoming vehicles flash their high beams at you, this may also mean the vertical aim needs to be adjusted.

It is recommended that the vehicle is taken to your dealer for service if the headlamps need to be re-aimed. It is possible however, to re-aim the headlamps as described in the following procedure.

The vehicle should be properly prepared as follows

  1. The vehicle should be placed so the headlamps are 25 ft (7.6 m) from a light colored wall or other flat surface.
  2. The vehicle must have all four tires on a perfectly level surface which is level all the way to the wall or other flat surface.
  3. The vehicle should be placed so it is perpendicular to the wall or other flat surface.
  4. The vehicle should not have any snow, ice or mud on it.
  5. The vehicle should be fully assembled and all other work stopped while headlamp aiming is being done.
  6. The vehicle should be normally loaded with a full tank of fuel and one person or 160 lbs (75 kg) on the driver seat.
  7. Tires should be properly inflated.

Headlamp aiming is done with the vehicle low-beam headlamps. The high-beam headlamps will be correctly aimed if the low-beam headlamps are aimed properly.

  1. To adjust the vertical aim on the headlamps, open the hood, and complete the following
  2. Measure the distance from the ground to the center of the lamp. Record the vertical distance.
  3. At the wall or other flat surface, measure from the ground upward the recorded vertical distance and draw or tape a horizontal line the width of the vehicle.
  4. Turn on the low-beam headlamps and place a piece of cardboard or equivalent in front of the headlamp not being aimed. This should allow only the beam of light from the headlamp being aimed to be seen on the flat surface.
  5. Adjust the vertical headlamp adjustment screw until the Hot Spot (Center of mass of the Bright Area) is set at 8.0 inches (2) below the headlamp horizontal access (1) within +/- 2 inches when measured at 25 feet.
  6. Adjust the vertical headlamp adjustment screw until the Right Gradient Line (Cutoff Line) is set at the Horizontal Axis within +/- 2.0 inches (2) measured at 25 feet.
  7. Repeat steps 5 and 6 for the opposite headlamp.

Scheme 43

Scheme 43: Front Fog Lamp Replacement (Acadia)
Scheme 43: Front Fog Lamp Replacement (Acadia)
CalloutComponent Name
Preliminary Procedures Remove the wheelhouse liner. Refer to Front Wheelhouse Front Liner Replacement (Enclave - Acadia) . Remove the fog lamp bezel. Refer to Front Fog Lamp Bezel Replacement (Acadia) . Disconnect the electrical connector. From the inside of the front bumper fascia, using a blunt instrument, pinch the retainers and push outward on the 2 upper mounting studs for the fog lamp. Using the same blunt instrument, pinch the retainer and push outward on the adjustment screw for the fog lamp.
1Fog Lamp Retainer (Qty: 3) Procedure Ensure the retainers are repositioned into the front bumper fascia mounting holes prior to the installation of the new fog lamp if they become dislodged during the removal of the lamp.
2Fog Lamp Assembly WARNING: Refer to Halogen Bulb Warning . Procedure Remove the bulb socket from the lamp assembly and transfer as necessary.
WARNING
Refer to Halogen Bulb Warning .

Front Fog Lamp Replacement (Acadia)

Scheme 44

Scheme 44: Front Fog Lamp Replacement (Enclave)
Scheme 44: Front Fog Lamp Replacement (Enclave)
CalloutComponent Name
Preliminary Procedure Remove the front wheelhouse liner. Refer to Front Wheelhouse Front Liner Replacement (Enclave - Acadia) .
1Front Fog Lamp Bulb WARNING: Refer to Halogen Bulb Warning . Procedure Rotate the bulb socket counterclockwise and remove the bulb assembly from the fog lamp.
2Front Fog Lamp Screw (Qty: 2) CAUTION: Refer to Fastener Caution . Tighten 2 N.m (18 lb in)
3Front Fog Lamp Adjuster Screw Retainer TIP: Ensure the retainer is secure to the fog lamp housing ring.
4Front Fog Lamp Adjuster Screw Procedure Remove the fog lamp adjuster screw out the front of the lower front bumper fascia. Count the number of turns outward when removing the screw in order to re-install the screw close to the same position. Adjust the front fog lamp assembly after the replacement. Refer to Fog Lamp Aiming (Acadia) , Fog Lamp Aiming (Enclave) .
5Front Fog Lamp Assembly Procedure Remove the fog lamp housing from the fog lamp retainer ring.
WARNING
Refer to Halogen Bulb Warning .
CAUTION
Refer to Fastener Caution .

Front Fog Lamp Replacement (Enclave)

Scheme 45

Scheme 45: Front Fog Lamp Bulb Replacement (Acadia)
Scheme 45: Front Fog Lamp Bulb Replacement (Acadia)
CalloutComponent Name
Preliminary Procedures Remove the wheelhouse liner. Refer to Front Wheelhouse Front Liner Replacement (Enclave - Acadia) . Disconnect the electrical connector from the fog lamp bulb socket.
1Front Fog Lamp Bulb WARNING: Refer to Halogen Bulb Warning . Procedure Twist the bulb socket counterclockwise and remove the fog lamp bulb.
WARNING
Refer to Halogen Bulb Warning .

Front Fog Lamp Bulb Replacement (Acadia)

Scheme 46

Scheme 46: Front Fog Lamp Bulb Replacement (Enclave)
Scheme 46: Front Fog Lamp Bulb Replacement (Enclave)
CalloutComponent Name
Preliminary Procedure Remove the front wheelhouse liner. Refer to Front Wheelhouse Front Liner Replacement (Enclave - Acadia) .
1Front Fog Lamp Bulb Socket Electrical Connector Procedure Disengage the electrical connector from the fog lamp bulb socket.
2Front Fog Lamp Bulb Socket WARNING: Refer to Halogen Bulb Warning . Procedure Rotate the bulb socket counterclockwise and remove from the fog lamp assembly.
WARNING
Refer to Halogen Bulb Warning .

Front Fog Lamp Bulb Replacement (Enclave)

Fog Lamp Aiming (Acadia)

The front fog lamps must be aimed for proper illumination of the road. The front fog lamp aim should be checked when a new front fog lamp assembly is installed, or if service or repairs in the front end area may have disturbed the front fog lamp mounting.

Preparation Procedure

IMPORTANTHorizontal aim is not adjustable on this vehicle. Vertical aim is adjusted by an adjusting screw located on the bottom rear of the fog lamp. Prior to aiming the fog lamps, perform the following steps
  1. Completely assemble all of the components on the vehicle.
  2. Park the vehicle on a level surface.
  3. Stop all unnecessary operations or work on the vehicle that affect the vehicle trim.
  4. Close the doors and ensure that the vehicle has no load other than the driver.
  5. Stabilize the suspension by rocking the vehicle sideways.
  6. Ensure that the fuel level is 1/2 full.
  7. Ensure that the tires are inflated to the proper pressure.
  8. Ensure that the driver or a similar weight, approximately 75 kg (165 lb), is in the vehicle driver seat.

Aiming Procedure

  1. Park the vehicle on a level surface 7.6 m (25 ft) (3) away from a wall or other flat surface.
  2. Measure the distance from the floor to the center of the fog lamp (5).
  3. Using this measurement, mark the horizontal centerline of the fog lamp (1) on the flat surface directly in front of the vehicle.
  4. Remove the front portion of the front wheel liner in order to access the adjusting screw.
  5. Turn ON the fog lamps.
  6. Reach inside of the front portion of the fender liner in order to access the fog lamp vertical adjustment screw on the bottom of the fog lamp.
  7. Adjust the fog lamp so that the top edge of the fog lamp beam pattern is 100 mm (4 in) below the horizontal centerline (2).
  8. Turn OFF the fog lamps.
  9. Secure the forward edge of the front fender liner.

Fog Lamp Aiming (Enclave)

The front fog lamps must be aimed for proper illumination of the road. The front fog lamp aim should be checked when a new front fog lamp assembly is installed, or if service or repairs in the front end area may have disturbed the front fog lamp mounting.

IMPORTANTHorizontal aim is not adjustable on this vehicle. Vertical aim is adjusted by an adjusting screw located on the lower exterior bumper fascia, located at the top side of the lamp projector. Prior to aiming the fog lamps, perform the following steps
  1. Completely assemble all of the components on the vehicle.
  2. Park the vehicle on a level surface.
  3. Stop all unnecessary operations or work on the vehicle that affect the vehicle trim.
  4. Close the doors and ensure that the vehicle has no load other than the driver.
  5. Stabilize the suspension by rocking the vehicle sideways.
  6. Ensure that the fuel level is 1/2 full.
  7. Ensure that the tires are inflated to the proper pressure.
  8. Ensure that the driver or a similar weight, approximately 75 kg (165 lb), is in the vehicle driver seat.
  1. Park the vehicle on a level surface 7.6 m (25 ft) (3) away from a wall or other flat surface.
  2. Measure the distance from the floor to the center of the fog lamp (5).
  3. Using this measurement, mark the horizontal centerline of the fog lamp (1) on the flat surface directly in front of the vehicle.
  4. Turn ON the fog lamps.
  5. Turn the external adjusting screw until the fog lamp pattern properly set.
  6. Adjust the fog lamp so that the top edge of the fog lamp beam pattern is 100 mm (4 in) below the horizontal centerline (2).
  7. Turn OFF the fog lamps.

Scheme 47

Scheme 47: Daytime Running Lamp Bulb Replacement (Enclave)
Scheme 47: Daytime Running Lamp Bulb Replacement (Enclave)
CalloutComponent Name
Preliminary Procedure Remove the front wheelhouse liner. Refer to Front Wheelhouse Front Liner Replacement (Enclave - Acadia) .
1Daytime Running Lamp Socket Assembly TIP: Rotate counterclockwise the bulb socket and pull downward.
2Daytime Running Lamp Bulb WARNING: Refer to Halogen Bulb Warning . TIP: Pull the bulb straight from the socket assembly.
WARNING
Refer to Halogen Bulb Warning .

Daytime Running Lamp Bulb Replacement (Enclave)

Scheme 48

Scheme 48: Daytime Running Lamp Replacement
Scheme 48: Daytime Running Lamp Replacement
CalloutComponent Name
Preliminary Procedure Remove the front fog lamp bezel. Refer to Front Fog Lamp Bezel Replacement (Acadia) , Front Fog Lamp Bezel Replacement (Enclave) .
1Daytime Running Lamp Assembly Screw CAUTION: Refer to Fastener Caution . Tighten (2.5 N.m (22 lb in)
2Daytime Running Lamp Assembly Procedure Rotate the lamp assembly forward and lift upward in order to disengage the lamp tabs from the parking and front fog lamp bracket assembly.
3Parking and Front Fog Lamp Bracket
CAUTION
Refer to Fastener Caution .

Daytime Running Lamp Replacement

Scheme 49

Scheme 49: Front Side Marker Lamp Bulb Replacement (Traverse)
Scheme 49: Front Side Marker Lamp Bulb Replacement (Traverse)
CalloutComponent Name
Preliminary Procedure Remove the front wheelhouse liner front in order to access the front side marker lamp bulb. Refer to Front Wheelhouse Front Liner Replacement (Traverse) .
1Front Side Marker Lamp Bulb Socket Procedure Rotate the bulb socket counter-clockwise and remove the socket from the park turn lamp housing.
2Front Side Marker Lamp Bulb Procedure Pull the marker lamp bulbs straight from the lamp bulb socket.

Front Side Marker Lamp Bulb Replacement (Traverse)

Scheme 50

Scheme 50: Front Side Marker Lamp Bulb Replacement (Acadia)
Scheme 50: Front Side Marker Lamp Bulb Replacement (Acadia)
CalloutComponent Name
Preliminary Procedures Remove the front wheelhouse liner in order to access the front turn signal bulbs. Refer to Front Wheelhouse Front Liner Replacement (Enclave - Acadia) . Disconnect the front marker lamp bulb socket from the headlamp assembly.
1Front Marker Lamp Bulb Procedure Pull the marker lamp bulbs straight from the lamp socket.

Front Side Marker Lamp Bulb Replacement (Acadia)

Scheme 51

Scheme 51: Front Side Marker Lamp Bulb Replacement (Enclave)
Scheme 51: Front Side Marker Lamp Bulb Replacement (Enclave)
CalloutComponent Name
Preliminary Procedures Remove the front wheelhouse liner in order to access the front turn signal bulbs. Refer to Front Wheelhouse Front Liner Replacement (Enclave - Acadia) . Disconnect the front marker lamp bulb socket from the headlamp assembly.
1Front Marker Lamp Bulb Cover Procedure Rotate the cover counterclockwise and remove the cover from the lamp housing.
2Front Marker Lamp Bulb Procedure Pull the marker lamp bulbs straight from the lamp socket.

Front Side Marker Lamp Bulb Replacement (Enclave)

Scheme 52

Scheme 52: Rear Side Marker Lamp Bulb Replacement (Acadia)
Scheme 52: Rear Side Marker Lamp Bulb Replacement (Acadia)
CalloutComponent Name
Preliminary Procedure Remove the tail lamp assembly. Refer to Tail Lamp Replacement (Acadia) .
1Rear Side Marker Lamp Bulb Socket TIP: Rotate one quarter turn to release the socket from the tail lamp assembly.
2Rear Side Marker Lamp Bulb

Rear Side Marker Lamp Bulb Replacement (Acadia)

Scheme 53

Scheme 53: Rear Side Marker Lamp Bulb Replacement (Enclave)
Scheme 53: Rear Side Marker Lamp Bulb Replacement (Enclave)
CalloutComponent Name
Preliminary Procedure Remove the rear tail lamp assembly in order to access the tail lamp bulbs. Refer to Tail Lamp Replacement (Enclave) .
1Rear Tail Lamp Socket Procedure Rotate one quarter turn to release the socket from the tail lamp assembly.
2Rear Park Turn Tail Lamp Bulb WARNING: Refer to Halogen Bulb Warning .
3Rear Marker Lamp Socket
4Rear Marker Lamp Bulb TIP: Pull the bulb straight from the socket.
WARNING
Refer to Halogen Bulb Warning .

Rear Side Marker Lamp Bulb Replacement (Enclave)

Scheme 54

Scheme 54: Parking and Turn Signal Lamp Replacement (Traverse)
Scheme 54: Parking and Turn Signal Lamp Replacement (Traverse)
CalloutComponent Name
Preliminary Procedure Remove the front wheelhouse front liner. Refer to Front Wheelhouse Front Liner Replacement (Traverse) .
1Park and Turn Signal Lamp Assembly Screw (Qty: 4) CAUTION: Refer to Fastener Caution . Tighten 1.5 N.m (13 lb in)
2Park and Turn Signal Lamp Assembly Procedure Disconnect the jumper harness from the forward lamp harness connector. Transfer the jumper harness with bulb sockets and bulbs as needed. Remove the lamp assembly from the upper fascia reinforcement bracket.
CAUTION
Refer to Fastener Caution .

Parking and Turn Signal Lamp Replacement (Traverse)

Scheme 55

Scheme 55: Parking and Turn Signal Lamp Bulb Replacement (Traverse)
Scheme 55: Parking and Turn Signal Lamp Bulb Replacement (Traverse)
CalloutComponent Name
Preliminary Procedures Remove the front wheelhouse liner front in order to access the front turn signal bulb. Refer to Front Wheelhouse Front Liner Replacement (Traverse) . Rotate and disconnect the front turn signal bulb socket from the park, turn lamp assembly.
1Park and Turn Signal Bulb WARNING: Refer to Halogen Bulb Warning . Procedure Pull the bulb straight from the lamp assembly bulb socket.
WARNING
Refer to Halogen Bulb Warning .

Parking and Turn Signal Lamp Bulb Replacement (Traverse)

Scheme 56

Scheme 56: Parking and Turn Signal Lamp Bulb Replacement (Acadia)
Scheme 56: Parking and Turn Signal Lamp Bulb Replacement (Acadia)
CalloutComponent Name
Preliminary Procedures Remove the front wheelhouse liner in order to access the front turn signal bulb. Refer to Front Wheelhouse Front Liner Replacement (Enclave - Acadia) . Disconnect the front turn signal bulb socket from the headlamp assembly. Disconnect the electrical connector.
1Turn Signal Bulb WARNING: Refer to Halogen Bulb Warning . Procedure Discard the bulb and socket assembly.
WARNING
Refer to Halogen Bulb Warning .

Parking and Turn Signal Lamp Bulb Replacement (Acadia)

Scheme 57

Scheme 57: Parking and Turn Signal Lamp Bulb Replacement (Enclave)
Scheme 57: Parking and Turn Signal Lamp Bulb Replacement (Enclave)
CalloutComponent Name
WARNING: The high intensity discharge system produces high voltage and current. To reduce the risk of severe shocks and burns: Never open the high intensity discharge system ballast or the arc tube assembly starter. Never probe between the high intensity discharge system ballast output connector and the arc tube assembly. Preliminary Procedure Remove the front compartment sight shield. Refer to Front Compartment Sight Shields Replacement (Enclave) .
1Headlamp Capsule Park Turn Lamp Electrical Connector
2Headlamp Capsule Park Turn Lamp Bulb WARNING: Refer to Halogen Bulb Warning . Procedure Rotate the bulb socket counter-clockwise and remove from the lamp housing.
WARNING
The high intensity discharge system produces high voltage and current. To reduce the risk of severe shocks and burns: Never open the high intensity discharge system ballast or the arc tube assembly starter. Never probe between the high intensity discharge system ballast output connector and the arc tube assembly.
WARNING
Refer to Halogen Bulb Warning .

Parking and Turn Signal Lamp Bulb Replacement (Enclave)

Removal Procedure

  1. Remove the front wheelhouse liner. Refer to «Front Wheelhouse Front Liner Replacement (Enclave - Acadia)»(/buick/enclave/i-2007-2013/remont/frames-subframes-crossmembers/#frame-and-underbody) .
  2. Remove the front bumper fascia. Refer to «Front Bumper Fascia Replacement (Enclave)»(/buick/enclave/i-2007-2013/remont/exterior-body-panels/#bumpers-and-fascias) .
  3. Remove the lower front bumper fascia to bracket screw (1).
  4. Remove the 3 upper and 3 lower screws (2).
  5. Remove the lower push lock retainer (4) and bolt (3).
  6. Release the two fog lamp bracket tabs from the front bumper fascia, push in order to release the tabs.
  7. Remove the parking and front fog lamp bracket (1) from the front bumper fascia (2).

Installation Procedure

  1. Position and align the parking and front fog lamp bracket (1) to inside the front bumper fascia (2).
  2. Secure the locking tabs to the front bumper fascia.
  3. Install the lower push lock retainer (4) and bolt (3).
  4. Install the 3 upper and 3 lower screws (2).
  5. Install the front bumper lower fascia to bracket screw (1) and tighten to 2.5 N.m (22 lb in).
  6. Install the front bumper fascia. Refer to «Front Bumper Fascia Replacement (Enclave)»(/buick/enclave/i-2007-2013/remont/exterior-body-panels/#bumpers-and-fascias) .
  7. Install the front wheelhouse liner. Refer to «Front Wheelhouse Front Liner Replacement (Enclave - Acadia)»(/buick/enclave/i-2007-2013/remont/frames-subframes-crossmembers/#frame-and-underbody) .

Scheme 58

Scheme 58: High Mount Stop Lamp Replacement (Traverse)
Scheme 58: High Mount Stop Lamp Replacement (Traverse)
CalloutComponent Name
Preliminary Procedures Open the liftgate. Remove the rear spoiler. Refer to Rear Spoiler Replacement (Enclave, Traverse) . Place the rear spoiler on a clean protected surface in order to remove the Light Emitted Diode (LED) high mounted stop lamp.
1High Mount Stop Lamp Screw (Qty: 2) CAUTION: Refer to Fastener Caution . Tighten 2 N.m (18 lb in)
2High Mount Stop Lamp Electrical Connector
3High Mount Stop Lamp Assembly Procedure Remove the high mount (LED) stop lamp from the bottom side of the rear spoiler.
CAUTION
Refer to Fastener Caution .

High Mount Stop Lamp Replacement (Traverse)

Scheme 59

Scheme 59: High Mount Stop Lamp Replacement (Acadia)
Scheme 59: High Mount Stop Lamp Replacement (Acadia)
CalloutComponent Name
Preliminary Procedures Open the liftgate. Remove the interior liftgate garnish molding. Refer to Liftgate Garnish Molding Replacement (TB4) , Liftgate Garnish Molding Replacement (TB5) . Remove the rear spoiler. Refer to Rear Spoiler Replacement (Acadia) .
1High Mounted Stop Lamp Electrical Connector
2High Mounted Stop Lamp Screws (Qty: 2) CAUTION: Refer to Fastener Caution . Tighten 2 N.m (18 lb in)
3High Mount Stop Lamp Assembly Procedure Remove the high mounted stop lamp from the bottom side of the rear spoiler.
CAUTION
Refer to Fastener Caution .

High Mount Stop Lamp Replacement (Acadia)

Scheme 60

Scheme 60: High Mount Stop Lamp Replacement (Enclave)
Scheme 60: High Mount Stop Lamp Replacement (Enclave)
CalloutComponent Name
Preliminary Procedures Open the liftgate. Remove the interior liftgate garnish molding. Refer to Liftgate Garnish Molding Replacement (TB4) , Liftgate Garnish Molding Replacement (TB5) . Remove the rear spoiler. Refer to Rear Spoiler Replacement (Enclave, Traverse) . Place the rear spoiler on a clean protected surface in order to remove the bottom mounted stop lamp.
1High Mount Stop Lamp Screws (Qty: 2) CAUTION: Refer to Fastener Caution . Tighten 2 N.m (18 lb in)
2High Mount Stop Lamp Assembly Procedure Remove the high mount stop lamp from the bottom side of the rear spoiler.
CAUTION
Refer to Fastener Caution .

High Mount Stop Lamp Replacement (Enclave)

Scheme 61

Scheme 61: Backup Lamp Replacement
Scheme 61: Backup Lamp Replacement
CalloutComponent Name
Preliminary Procedure Remove the lift gate interior trim panel. Refer to Liftgate Trim Panel Replacement (Traverse) , Liftgate Trim Panel Replacement (Enclave) , Liftgate Trim Panel Replacement (Acadia)
1Back Up Lamp Applique Nut (Qty: 3) CAUTION: Refer to Fastener Caution . Tighten 6 N.m (53 lb in)
2Integral Clip (Qty: 2)
3Back Up Lamp Applique Assembly TIP: Disconnect the bulb socket from the applique.
CAUTION
Refer to Fastener Caution .

Backup Lamp Replacement

Scheme 62

Scheme 62: Backup Lamp Bulb Replacement (Acadia)
Scheme 62: Backup Lamp Bulb Replacement (Acadia)
CalloutComponent Name
Preliminary Procedure Remove the lift gate interior trim panel. Refer to Liftgate Trim Panel Replacement (Acadia) .
1Back Up Lamp Socket Procedure Rotate and remove the socket from the lamp assembly.
2Back Up Lamp Bulb TIP: Remove the bulb and discard.

Backup Lamp Bulb Replacement (Acadia)

Scheme 63

Scheme 63: Backup Lamp Bulb Replacement (Enclave)
Scheme 63: Backup Lamp Bulb Replacement (Enclave)
CalloutComponent Name
Preliminary Procedure Remove the lift gate interior trim panel. Refer to Liftgate Trim Panel Replacement (Enclave) .
1Back Up Lamp Socket Procedure Rotate and remove the socket from the lamp assembly.
2Back Up Lamp Bulb TIP: Remove the bulb and discard.
3Marker Lamp Socket
4Marker Lamp Bulb

Backup Lamp Bulb Replacement (Enclave)

Scheme 64

Scheme 64: Backup Lamp Bulb Replacement (Traverse)
Scheme 64: Backup Lamp Bulb Replacement (Traverse)
CalloutComponent Name
Preliminary Procedure Remove the lift gate interior trim panel. Refer to Liftgate Trim Panel Replacement (Traverse) .
1Back Up Lamp Socket Procedure Disconnect the back up lamp bulb socket electrical connector. Rotate and remove the socket from the back up lamp applique assembly.
2Back Up Lamp Bulb WARNING: Refer to Halogen Bulb Warning . TIP: Pull the bulb from the lamp socket and discard.
WARNING
Refer to Halogen Bulb Warning .

Backup Lamp Bulb Replacement (Traverse)

Scheme 65

Scheme 65: Backup Lamp Applique Replacement (Traverse)
Scheme 65: Backup Lamp Applique Replacement (Traverse)
CalloutComponent Name
Preliminary Procedure Remove the lift gate interior trim panel. Refer to Liftgate Trim Panel Replacement (Traverse) . Remove the back up lamp assembly bulb socket from the back up lamp applique.
1Back Up Lamp Applique Nut (Qty: 2) CAUTION: Refer to Fastener Caution . Tighten 6 N.m (53 lb in)
2Back Up Lamp Clamp (Qty: 2) TIP: Remove the clamps from the lamp assembly in order to remove the lamp from the liftgate.
3Back Up Lamp Applique Assembly
CAUTION
Refer to Fastener Caution .

Backup Lamp Applique Replacement (Traverse)

  1. Remove the liftgate interior trim panel. Refer to «Liftgate Trim Panel Replacement (Acadia)»(/buick/enclave/i-2007-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling__liftgate-trim-panel-replacement-acadia) .
  2. Disconnect the backup lamp and running lamp electrical connectors.
  3. Remove the screw (1) securing the lamp assembly bracket (2) to the rear auxiliary back up lamp assembly.
  4. Remove the bracket.
  5. Remove the auxiliary back up lamp assembly nuts (1).
  6. Disconnect the backup lamp bulb socket (2) and bulb (3).
  7. Pull the backup lamp assembly (2) from the outer liftgate filler panel.
  8. Remove the lamp assembly gasket (1).
  1. Position the backup lamp gasket (1) to the auxiliary back up lamp assembly (2).
  2. Insert the backup lamp assembly into the holes in the outer liftgate filler panel.
  3. Install the nuts (1). Tighten 5 N.m (44 lb in).
  4. Install the back up lamp bulb (3) into the bulb socket (2).
  5. Install the bulb assembly into the lamp.
  6. Position the auxiliary backup lamp bracket (2) onto the backup lamp assembly.
  7. Install the screw (1). Tighten 2 N.m(18 lb in).
  8. Connect the backup lamp and running lamp electrical connectors.
  9. Install the interior liftgate trim panel. Refer to «Liftgate Trim Panel Replacement (Acadia)»(/buick/enclave/i-2007-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling__liftgate-trim-panel-replacement-acadia) .

Scheme 66

Scheme 66: Backup Lamp Applique Replacement (Enclave)
Scheme 66: Backup Lamp Applique Replacement (Enclave)
CalloutComponent Name
Preliminary Procedure Remove the lift gate interior trim panel. Refer to Liftgate Trim Panel Replacement (Enclave) . Disconnect the electrical connector at the back up lamp applique.
1Back Up Lamp Applique Nut (Qty: 3) CAUTION: Refer to Fastener Caution . Tighten 6 N.m (53 lb in)
2Integral Clips (Qty: 2) TIP: Release the clips securing the lamp assembly to the liftgate outer filler panel and push outward.
3Back Up Lamp Applique Assembly
4Back Up Lamp Applique Assembly Gasket TIP: Ensure the gasket is in place prior to the back up lamp applique installation.
CAUTION
Refer to Fastener Caution .

Backup Lamp Applique Replacement (Enclave)

Scheme 67

Scheme 67: Rear License Plate Lamp Replacement (Acadia)
Scheme 67: Rear License Plate Lamp Replacement (Acadia)
CalloutComponent Name
1Rear License Plate Lamp Screws (Qty: 4) CAUTION: Refer to Fastener Caution . Tighten 2 N.m (18 lb in)
2Rear License Plate Lamp (Qty: 2) Procedure Pull the lamps downward and disconnect the bulb sockets from the lamps.
CAUTION
Refer to Fastener Caution .

Rear License Plate Lamp Replacement (Acadia)

Scheme 68

Scheme 68: Rear License Plate Lamp Bulb Replacement (Enclave)
Scheme 68: Rear License Plate Lamp Bulb Replacement (Enclave)
CalloutComponent Name
Preliminary Procedure Remove the rear license plate lamp.
1Rear License Plate Lamp Bulb Socket (Qty: 2)
2Rear License Plate Lamp Bulb (Qty: 2) Procedure Hold the lamp socket and pull the lamp bulb straight from the lamp socket.

Rear License Plate Lamp Bulb Replacement (Enclave)

Rear License Plate Lamp Bulb Replacement (Acadia)

CalloutComponent Name
1Rear License Plate Lamp Screws (Qty: 4) CAUTION: Refer to Fastener Caution . Tighten 2 N.m (18 lb in)
2Rear License Plate Lamp (Qty: 2) Procedure Pull the lamps downward and disconnect the bulb from the lamp sockets.
CAUTION
Refer to Fastener Caution .

Rear License Plate Lamp Bulb Replacement (Acadia)

Scheme 69

Scheme 69: Rear License Plate Lamp Wiring Harness Replacement (With UVC)
Scheme 69: Rear License Plate Lamp Wiring Harness Replacement (With UVC)
CalloutComponent Name
Preliminary Procedure Remove the rear liftgate applique. Refer to Liftgate Applique Replacement (Enclave) , Liftgate Applique Replacement (Acadia) .
1Applique Outer Retainer Screw (Qty: 2) CAUTION: Refer to Fastener Caution . Procedure Remove the screw from the applique.
2Applique Isolator Procedure Remove the isolator.
3Lift Handle Bracket Screw (Qty: 2) Procedure Remove the bracket screws.
4Rear License Plate Bulb Socket (Qty: 2) Procedure Disengage the bulb sockets from the liftgate applique lamp housing.
5Rear Camera Module Harness Connector Procedure Disconnect the electrical connector.
6Touch Pad Bracket Procedure Release the touch pad from the bracket.
7Rear License Plate Lamp Wiring Harness
CAUTION
Refer to Fastener Caution .

Rear License Plate Lamp Wiring Harness Replacement (With UVC)

Scheme 70

Scheme 70: Rear License Plate Lamp Wiring Harness Replacement (Without UVC)
Scheme 70: Rear License Plate Lamp Wiring Harness Replacement (Without UVC)
CalloutComponent Name
Preliminary Procedure Remove the rear liftgate applique. Refer to Liftgate Applique Replacement (Enclave) , Liftgate Applique Replacement (Acadia) .
1Applique Outer Retainer Screw (Qty: 2) CAUTION: Refer to Fastener Caution . Procedure Remove the screw from the applique.
2Applique Isolator Procedure Remove the isolator.
3Lift Handle Bracket Screw (Qty: 2) Procedure Remove the bracket screws.
4Rear License Plate Bulb Socket (Qty: 2) Procedure Disengage the bulb sockets from the liftgate applique lamp housing.
5Touch Pad Bracket Procedure Release the touch pad from the bracket.
6Rear License Plate Lamp Wiring Harness
CAUTION
Refer to Fastener Caution .

Rear License Plate Lamp Wiring Harness Replacement (Without UVC)

Scheme 71

Scheme 71: Tail Lamp Replacement (Traverse)
Scheme 71: Tail Lamp Replacement (Traverse)
CalloutComponent Name
Preliminary Procedure Open the lift gate in order to access the tail lamp access hole covers.
1Tail Lamp Access Hole Cover (Qty: 2) Procedure Use a small flat-bladed tool in order to disengage, Do Not Remove the covers.
2Tail Lamp Screw (Qty: 2) CAUTION: Refer to Fastener Caution . Tighten 2.5 N.m (22 lb in)
3Tail Lamp Assembly Procedure Grasp the forward outer edge of the lamp assembly and with a quick pull rearward, disengage the locator pin from the quarter outer panel. Pull the lamp assembly from the body pillar outer pocket. Disconnect the electrical connector from the rear lamp harness. Transfer the stop / turn signal and side marker lamp bulb electrical jumper harness as needed.
CAUTION
Refer to Fastener Caution .

Tail Lamp Replacement (Traverse)

Scheme 72

Scheme 72: Tail Lamp Replacement (Acadia)
Scheme 72: Tail Lamp Replacement (Acadia)
CalloutComponent Name
Preliminary Procedure Open the lift gate in order to access the tail lamp access hole covers.
1Tail Lamp Access Hole Cover (Qty: 2) TIP: Use a small flat bladed tool in order to remove the covers.
2Tail Lamp Screw (Qty: 2) CAUTION: Refer to Fastener Caution . Tighten 3 N.m (27 lb in)
3Tail Lamp Assembly TIP: Disconnect the electrical connector prior to removing the tail lamp from the rear body panel.
4Tail Lamp Filler Panel Nut TIP: Inspect the nuts, replace if damaged.
CAUTION
Refer to Fastener Caution .

Tail Lamp Replacement (Acadia)

Tail Lamp Replacement (Enclave)

CalloutComponent Name
Preliminary Procedure Open the lift gate in order to access the tail lamp access hinged hole covers.
1Tail Lamp Access Hinged Hole Cover (Qty: 2) Procedure Use a small flat bladed tool at the topside of the covers in order to release and open the hinged covers.
2Tail Lamp Screw (Qty: 2) CAUTION: Refer to Fastener Caution . Tighten 3 N.m (27 lb in)
3Tail Lamp Assembly Procedure Firmly hold the lamp assembly and with a quick jerk, disengage the locator pin from the rear body panel retainer. Disconnect the electrical connector at the tail lamp prior to removing the tail lamp from the rear body panel.
4Tail Lamp Filler Panel Nuts TIP: Inspect the filler panel nuts, replace if damaged.
CAUTION
Refer to Fastener Caution .

Tail Lamp Replacement (Enclave)

Scheme 73

Scheme 73: Tail Lamp Bulb Replacement (Acadia)
Scheme 73: Tail Lamp Bulb Replacement (Acadia)
CalloutComponent Name
Preliminary Procedure Remove the tail lamp assembly. Refer to Tail Lamp Replacement (Acadia) .
1Stop, Tail, Turn Signal Lamp Bulb Socket Procedure Rotate and remove the lamp socket from the tail lamp housing.
2Stop, Tail, Turn Signal Lamp Bulb TIP: Pull the bulb straight from the lamp socket.

Tail Lamp Bulb Replacement (Acadia)

Tail Lamp Bulb Replacement (Enclave)

CalloutComponent Name
Preliminary Procedure Remove the tail lamp assembly. Refer to Tail Lamp Replacement (Enclave) .
1Stop, Tail, Turn Signal Lamp Bulb Socket Procedure Rotate and remove the lamp socket from the tail lamp housing.
2Stop, Tail, Turn Signal Lamp Bulb TIP: Pull the bulb straight from the lamp socket.
3Rear Side Marker Lamp Socket Procedure Rotate and remove the lamp socket from the tail lamp housing.
4Rear Side Marker Lamp Bulb

Tail Lamp Bulb Replacement (Enclave)

Scheme 74

Scheme 74: Tail Lamp Bulb Replacement (Traverse)
Scheme 74: Tail Lamp Bulb Replacement (Traverse)
CalloutComponent Name
Preliminary Procedure Remove the tail lamp assembly. Refer to Tail Lamp Replacement (Traverse) .
1Stop and Turn Lamp Bulb Socket Procedure Rotate and remove the lamp socket from the tail lamp housing.
2Stop and Turn Lamp Bulb WARNING: Refer to Halogen Bulb Warning . TIP: Pull the bulb straight from the lamp socket.
WARNING
Refer to Halogen Bulb Warning .

Tail Lamp Bulb Replacement (Traverse)

Scheme 75

Scheme 75: Liftgate Courtesy Lamp Replacement
Scheme 75: Liftgate Courtesy Lamp Replacement
CalloutComponent Name
1Liftgate Jumper Wiring Harness Assembly
2Liftgate Courtesy Lamp Assembly Procedure Carefully use a plastic flat-bladed tool, and release the tab retaining the lamp lens to the Liftgate assembly. Disconnect the electrical connection.

Liftgate Courtesy Lamp Replacement

Exterior Lamps

The exterior lighting system consists of the following lamps

  1. The headlamps
  2. The daytime running lamps (DRL)
  3. The adaptive forward lighting system
  4. The front fog lamps
  5. The park, tail, and marker lamps
  6. The turn signal lamps
  7. The stop lamps
  8. The backup lamps

Headlamps (Standard)

Major components of this system are the body control module (BCM), headlamp relay, beam select relay, ambient light sensor, headlamp and panel dimmer switch, turn signal/multifunction switch, park brake switch, and the low and high beam headlamps.

The headlamps may be turned ON in 3 different ways. First, when the driver places the headlamp switch in the ON position, normal operation occurs. Second, when the headlamp switch is placed in the AUTO position, automatic lamp control (ALC) operation occurs. During ALC control, the headlamps will be OFF in daylight conditions or in low/high beam operation in low light conditions. Third is in wiper activated headlamp (WAH) mode. Only when the wiper system is activated while the vehicle is in gear, the wiper blades have completed at least 3 cycles, and then a 35 second time period expires, will the BCM switch from daytime running lamps (DRL) mode to headlamp mode during daylight conditions. When the gearshift lever is placed in the PARK or NEUTRAL position or if the wipers are turned OFF, normal manual or ALC operation will resume after approximately 60 seconds.

The headlamp relay receives battery positive voltage directly from the battery. The BCM supplies a ground signal to the headlamp relay for normal headlight operation. The BCM also supplies voltage to the beam select relay coil for high beam headlight operation. When the driver places the headlamp switch in the ON position and the dimmer switch is in the low beam position, the headlamp relay supplies current flow through the left and right low beam headlamp fuses to both low and high beam headlamps. Both low beam headlights are grounded through the beam select relay. When activated, the dimmer switch sends a ground signal to the BCM in the high beam position and a momentary ground signal in the flash-to-pass (FTP) position. The BCM then energizes the beam select relay which switches the headlamp grounds from the low beam headlight bulbs to the high beam headlight bulbs illuminating the high beam headlights. With the headlights in the low beam position, the high beams may be momentarily turned ON or flashed by activating the FTP portion of the switch.

The instrument panel cluster (IPC) illuminates the high beam indicator when the BCM detects that the high beams are requested. The IPC receives a class 2 message from the BCM requesting illumination.

The Headlamps On at Exit and Perimeter Lighting modes can be adjusted using the steering wheel controls to select the desired function as displayed in the driver information center (DIC). The Headlamps On at Exit selection will allow the driver to customize the period of time that the headlamps remain illuminated upon exiting the vehicle. This period can be adjusted from 0-180 seconds. The Perimeter Lighting feature allows the driver to select if they desire the headlamps and backup lamps to illuminate when the door UNLOCK button on the key fob is activated. This feature can be turned ON or OFF by using the DIC steering wheel control buttons.

High Intensity Discharge (HID) Low Beam Headlamps (Uplevel)

WARNINGThe high intensity discharge system produces high voltage and current. To reduce the risk of severe shocks and burns: Never open the high intensity discharge system ballast or the arc tube assembly starter. Never probe between the high intensity discharge system ballast output connector and the arc tube assembly.

Battery voltage is applied at all times to the coil and switched side of the low beam relay. Ground is applied at all times to the headlamp switch. When the headlamp switch is placed in the HEAD position, ground is applied from the headlamp switch through the headlamps ON signal circuit to the body control module (BCM). The BCM applies ground to the headlamp low beam relay control circuit. This energizes the low beam relay coil, closing the switch side contacts, and applies battery voltage to the LEFT and RIGHT LOW BEAM fuses. Battery voltage is then applied from the fuses, through the low beam voltage supply circuits to the left and right headlamp ballast located in each headlamp assembly. When battery voltage is applied to the headlamp ballast through the low beam voltage supply circuits, the ballast charge the starter to start the lamp. High intensity discharge (HID) headlamps do not have filaments like traditional bulbs, instead the starter uses a high voltage transformer to convert the input voltage into a higher voltage. This increased voltage is used in order to create an arc between the electrodes in the bulb.

Run Up Of The Lamp

Each ballast requires higher amperage in order to ensure normal startup and run up of the lamp. Run up is the term used to describe the extra power level given to the bulb. The input current during the steady state operation is lower that the start up amperage. After the lamp receives the strike from the starter and the arc is established, the ballast uses its operating voltage in order to provide the run up power needed in order to keep the lamp on. The lamp rapidly increases in intensity from a dim glow to a very high-intensity, bright light called a steady state. Within a few seconds of the arc being established in the bulb, the majority of steady state is complete. 100 percent of the steady state is completed shortly there after. A high watt power level is necessary in order to bring the lamp to a steady state in such a short period of time. The high watt power level allows the lamp to meet the SAE light vs. time specification.

When To Change The HID Bulb

Bulb failure, end of life occurs when the bulb gets old and becomes unstable. The bulb may begin shutting itself off sporadically and unpredictably at first, perhaps only once during a 24-hour period. When the bulb begins shutting itself off occasionally, the ballast will automatically turn the bulb back on again within 0.5 seconds. The ballast will re-strike the bulb so quickly that the bulb may not appear to have shut off. As the bulb ages, the bulb may begin to shut off more frequently, eventually over 30 times per minute. When the bulb begins to shut off more frequently, the ballast receives excessive, repetitive current input . Repetitive and excessive restarts or re-strikes, without time for the ballast to cool down, will permanently damage the ballast. As a safeguard, when repetitive re-strikes are detected, the ballast will not attempt to re-strike the lamp. The ballast then shuts down and the bulb goes out.

The following symptoms are noticeable signs of bulb failure

  1. Flickering light, caused in the early stages of bulb failure.
  2. Lights go out, caused when the ballast detects excessive, repetitive bulb re-strike.
  3. Color change-The lamp may change to a dim pink glow.

Input power to the ballast must be terminated in order to reset the ballast's fault circuitry. In order to terminate the input power to the ballast, turn the lights off and back on again. Turning the lights off and back on again resets all of the fault circuitry within the ballast until the next occurrence of excessive, repetitive bulb re-strikes. When excessive, repetitive bulb re-strikes occur, replace the starter/arc tube assembly. The ballast will begin the start-up process when the starter/arc tube assembly is replaced. Repeatedly resetting the input power can overheat the internal components and cause permanent damage to the ballast. Allow a few minutes of cool-down time in between reset attempts.

Bulb failures are often sporadic at first, and difficult to repeat. Technicians can identify bulb failure by observing if the problem gets progressively worse over the next 100 hours of operation.

Light Color

White light has a different color rating than regular headlamps. The range of white light that is acceptable is broad when compared to halogens. Therefore, some variation in headlight coloring between the right and left headlamp will be normal. One high intensity discharge (HID) at the end of the normal range may appear considerably different in color from one at the other end of the range. Difference in color is normal. Replace the arc tube only if the arc tube is determined to be at the bulb failure stage.

Daytime Running Lamps (DRL) without HID

The daytime running lamps (DRL) will illuminate the right and left low beam headlamps continuously. The DRLs will operate when the following conditions are met

  1. The ignition is in the RUN or CRANK position.
  2. The shift lever is out of the PARK position.
  3. The high and low beam headlamps are OFF.

The ambient light sensor is used to monitor outside lighting conditions. The ambient light sensor provides a voltage signal that will vary between 0.2 and 4.9 volts depending on outside lighting conditions. The body control module (BCM) provides a 5 V reference signal to the ambient light sensor. The BCM monitors the ambient light sensor signal circuit to determine if outside lighting conditions are correct for either daytime running lights (DRL) or automatic lamp control (ALC) when the headlamp switch is in the AUTO position. In daylight conditions, the BCM will command the DRLs ON by applying ground to the left and right DRL relays via separate left and right DRL relay control circuits. When the BCM applies ground to the relay control circuits, the left and right DRL relay coils energize causing both relay switch contacts to close. With the left and right DRL relay switch contacts closed, battery voltage flows through the left and right DRL fuses to the left and right DRL lamps or low beam headlamps depending on the vehicles option content. Any function or condition that turns on the headlamps will cancel DRL operation.

Daytime Running Lamps (DRL) with HID

The daytime running lamps (DRL) will illuminate continuously when the following conditions are met

  1. The ignition is in the RUN or CRANK position.
  2. The shift lever is out of the PARK position.
  3. The high and low beam headlamps are OFF.

The ambient light sensor is used to monitor outside lighting conditions. The ambient light sensor provides a voltage signal that will vary between 0.2 and 4.9 volts depending on outside lighting conditions. The body control module (BCM) provides a 5 V reference signal to the ambient light sensor. The BCM monitors the ambient light sensor signal circuit to determine if outside lighting conditions are correct for either daytime running lights (DRL) or automatic lamp control (ALC) when the headlamp switch is in the AUTO position. In daylight conditions, the BCM will command the DRLs ON by applying ground to the left and right DRL relays via separate left and right DRL relay control circuits. When the BCM applies ground to the relay control circuits, the left and right DRL relay coils energize causing both relay switch contacts to close. With the left and right DRL relay switch contacts closed, battery voltage flows through the left and right DRL fuses to the left and right DRL lamps. Any function or condition that turns on the headlamps will cancel DRL operation.

When the DRLs are active and a turn signal function is operated, the DRL associated with the turn signal lamp being commanded ON will cause the DLR lamp the turn OFF. An example of this would be when a left turn signal lamp is turn ON, the left DRL turns OFF. The left DRL will remain OFF until the left turn signal lamp is turned OFF.

On vehicles equipped with adaptive forward lighting, the headlamps can turn left and right to improve visibility during turns. In order for the adaptive forward lighting system to function, the following conditions must be met

  1. Ignition ON.
  2. Gear selector in DRIVE.
  3. Headlamp switch in AUTO position.
  4. The ambient light sensor indicating Night.
  5. Vehicle speed greater than 2 km/h (1.3 mph).
  6. The steering wheel is turned greater than 10 degrees to the right or left.

If turning right, the right headlamp turns a maximum of 15 degrees and the left headlamp a maximum of 5 degrees. If turning left, the left headlamp turns a maximum of 15 degrees and the right headlamp a maximum of 5 degrees. If the highbeam headlamps are on, the headlamps sensitivity/speed is reduced by half.

Demo mode can be activated by turning the ignition ON during the following conditions

  1. Gear selector in PARK.
  2. Headlamp switch in AUTO position.
  3. The ambient light sensor indicating Night.

When the ignition is turned ON during these conditions, the headlamps will cycle outboard and then back to center once. The adaptive forward lighting system is self-contained within the right and left headlamp assemblies. The right headlamp assembly contains the control module that drives the adaptive forward lighting motor for the right and left headlamps via serial data. Both right and left headlamps have no serviceable components with the exception of the headlamp ballast and bulb assemblies.

Fog Lamps

With both the ignition switch in the RUN position and the park lamps or low beam head lamps ON, the fog lights will illuminate when the driver presses the fog lamp switch. The FOG LP fuse in the underhood fuse block supplies battery positive voltage to the fog lamp relay. With the headlamp switch is in either the park or headlamp position and the fog lamp switch is pressed, the body control module (BCM) will energize the fog lamp relay control circuit. The current flow is from the fog lamp relay to both front fog lamps and to ground. The state of the fog lamps, either ON or OFF, will remain the same until the fog lamp switch is pressed again, or the ignition switch is cycled OFF and ON. Fog lamp operation will be cancelled whenever the park lamps are turned OFF or the high beam headlights have been selected.

Rear Fog Lamps

The rear fog lamp relay coil and switch terminals are supplied with battery voltage at all times. Ground is applied at all times to the rear fog lamp switch as part of the headlamp switch. When the rear fog lamp switch is placed in the ON position, ground is applied through the rear fog lamp switch signal circuit to the body control module (BCM). Battery voltage is applied at all times from the REAR FOG LAMP fuse to the REAR FOG LAMP relay. The BCM applies ground through the rear fog lamp relay control circuit to the coil side of the REAR FOG LAMP relay causing the relay coil to energize. When the relay is energized, the switch contacts close and battery voltage is applied from the REAR FOG LAMP fuse through the relay, to the rear fog lamps.

Park, Tail, Marker, License, and Clearance Lamps

The park, tail, marker, and license lamps are turned ON when the headlamp switch is placed in the PARK or ON position or anytime the headlights are requested. The underhood fuse block supplies battery positive voltage to both the park lamp relay switch contacts and the park lamp coil circuit. The body control module (BCM) provides a ground or control circuit to the park lamp relay coil circuit. When the park lamps are requested ON, the BCM energizes the park lamp relay. Current flow is from the park lamp relay to the individual park lamp circuit fuses and to their respective park, tail, marker, and license lamps. If the driver places the headlight switch in the ON position after the ignition switch has been turned OFF, the park, tail, marker, and license lamps will remain ON until turned OFF or the battery runs dead.

Turn Signal Lamps

The LT/TRN/SIG and RT/TRN/SIG fuses in the I/P fuse block supplies battery positive voltage to the body control module (BCM). When the turn signal switch is placed in either the left or right position, a signal is sent to the BCM to illuminate the desired turn signal lamps. The BCM has an internal flasher that sends an ON-OFF voltage signal to either the left or right turn signals and their instrument panel cluster (IPC) indicator. When the hazard switch is pressed, a separate ground signal is sent to the BCM to activate and flash all turn signal lamps including both IPC turn indicators.

The IPC illuminates the TURN SIGNAL ON indicator in the driver information center (DIC) when the IPC determines that the turn signal is active for more than 1.2 km (0.75 mi). The IPC cluster sends a serial data message to the radio in order to activate the audible warning.

Stop Lamps

Note. Brake system does not use a brake switch, stoplight switch or brakelight switch. System uses a Brake Pedal Position Sensor to control these functions.

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 and center high mounted stop lamp (CHMSL) control circuit. The stop lamps on this vehicle will not illuminate unless the ignition is in the accessory, run, or crank positions. When the ignition is in the OFF position the stop lamps will not illuminate when the brake pedal is applied.

Backup Lamps

The BACKUP/STOP fuse in the underhood fuse block supplies battery positive voltage to the normally open park/neutral position (PNP) switch of a vehicle equipped with an automatic transmission or the backup lamp switch if equipped with a manual transmission. When the driver places the gear selector lever is in the REVERSE position, the switch closes and the current flow is from the switch to the backup lamps. The engine may need to be running for the backup lamps to function.

Interior Lamps

The interior lamps consist of 2 groups, those which can dim from the instrument panel (I/P) dimmer switch and those that can not dim.

Courtesy/Illuminated Entry Lamps

The following lamps may be manually turned ON by placing the interior lamp switch in the ON position, or by opening a door while the switch is in the AUTO position.

  1. The dome lamp
  2. The liftgate lamps
  3. Courtesy/map lights

The courtesy lamp supply voltage circuit of the body control module (BCM) supplies battery positive voltage to the dome lamp, the liftgate lamps, and the map lamps. When any door is opened, the door jamb switch contacts close providing a door open input to the BCM. The BCM then provides a ground to the interior lamps with the switch in the AUTO position. The interior lamps receive a ground with the switch in the ON position.

Note. If the liftgate is opened after all the modules go to sleep, the dome light will not come on. The liftgate ajar switch input to the BCM will not wake up the BCM once it has gone to sleep, so the dome light will not come on. Once the BCM gets an input to wake it up, from remote keyless entry (RKE) or a door handle, the dome light will turn on when the liftgate is opened.

If the driver inadvertently leaves any interior lamp ON, the BCM will turn it OFF after a 20 minute time-out.

The courtesy lamps will turn OFF immediately if the ignition switch is turned to the ON position or approximately 20 seconds after all doors are closed.

Keyless Entry Interior Illumination

When the body control module (BCM) receives a door unlock command from the remote keyless entry (RKE) transmitter, the BCM will flash the park lamps several times, illuminate the courtesy and park lamps, and illuminate the low beam headlamps at low intensity. The lamps will remain on until the ignition key is turned from the OFF position, a RKE door lock command is received, or after an approximate 20 second delay.

Interior Lamps Dimming

This group includes lamps which may dim. This group may use a combination of vacuum fluorescent (VF) illumination and incandescent lamps.

  1. HVAC control module, head assembly
  2. Rear HVAC control module, head assembly
  3. Radio
  4. Rear seat Audio
  5. The instrument panel cluster (IPC)
  6. The PRNDL lamp, with the exception of the current gear select position
  7. Power window switches
  8. Various switches

When the ignition switch is turned to the ON position, the VF display, radio, turns ON at maximum brightness. When the park lamps are ON, all incandescent back lighting turn ON at the dimming level indicated by the instrument panel (I/P) dimmer switch. At the same time all VF displays dim to match the indicated dimming level. When the headlamp switch is placed in the PARK position, the park lamp supply voltage circuit provides an input to the body control module (BCM). The BCM then supplies voltage to the I/P dimmer switch through the I/P dimming lamps control circuit. The setting of the I/P dimmer switch determines the amount of voltage that the I/P dimmer switch supplies to the BCM through the I/P dimming lamps low reference circuit. The BCM then sends a pulse width modulation (PWM) voltage to all the interior lamps. All the VF and incandescent back lighting lamps are provided a specific voltage and are then grounded. When the headlight switch is turned to the park lamp or headlamp position, all incandescent back lighting turn ON at the dimming level indicated by the I/P dimmer switch. When the I/P dimmer switch is moved from MIN to MAX, all VF displays, as well as all incandescent back lighting respond from minimum intensity to maximum brightness in response to the I/P dimmer switch.

Inadvertent Power

The body control module (BCM) used in this vehicle controls the lighting system through circuits that enable the interior lamps. The BCM opens these enabling circuits shortly after the ignition switch is turned OFF with no lamp switch activity. If the ignition switch is turned to any position other than OFF, or if a lamp switch is activated during this period, the timer will reset itself.

See also:
• Diagnostic System Check - Vehicle
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• COMPONENT CONNECTOR END VIEWS - INDEX
• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
• Control Module References
• Diagnostic Repair Verification
• Relay Replacement (Within an Electrical Center)
• Relay Replacement (Attached to Wire Harness)
• Symptoms - Park Brake
• Engine Controls Schematics
• Cruise Control Schematics
• Checking Aftermarket Accessories
• Door Ajar Indicator Malfunction (With RPO AXC/AXE)
• Turn Signal Multifunction Switch Replacement
• Instrument Panel Insulator Panel Replacement - Left Side (Enclave)
• Fastener Caution
• Outside Rearview Mirror Glass Replacement
• Front Bumper Fascia Replacement (Traverse)
• Halogen Bulb Warning
• Front Wheelhouse Front Liner Replacement (Enclave - Acadia)
• Front Fog Lamp Bezel Replacement (Acadia)
• Front Compartment Sight Shields Replacement (Enclave)
• Liftgate Garnish Molding Replacement (TB4)
• Rear Spoiler Replacement (Acadia)
• Liftgate Trim Panel Replacement (Acadia)
• DTC B1395
• Brake Pedal Position Sensor Calibration
• Brake Pedal Position Sensor Replacement
• Tail Lamp Replacement (Enclave)
• Tail Lamp Bulb Replacement (Enclave)
• Headlamp Aiming
• Headlamp Capsule Replacement (Enclave TVC TSH)
• Fog Lamp Aiming (Acadia)
• Fog Lamp Aiming (Enclave)