Lighting Systems Buick Rendezvous I

Fastener Tightening Specifications

Fastener Tightening Specifications

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A/T Shift Lever Position Indicator Lamp Connector End (Pontiac) Connector Part Information 12162711 2-Way Pin Wire Color Circuit No. Function A GRY 8 Instrument Panel Lamp Supply Voltage B BLK 1450 Ground

Backup Lamp Connector End - Left (Buick) Connector Part Information 12110053 2-Way Lamp Socket Wedge Base W3 Right Angle (LT GRY) Pin Wire Color Circuit No. Function A BRN - Backup Lamp Supply Voltage B BLK - Ground

Backup Lamp Connector End - Right (Buick) Connector Part Information 12110053 2-Way Lamp Socket Wedge Base W3 Right Angle (LT GRY) Pin Wire Color Circuit No. Function A WHT - Backup Lamp Supply Voltage B BLK - Ground

Backup Lamp Connector End - Left (Pontiac) Connector Part Information 12160393 2-Way Lamp Socket Wedge Base W3 Right Angle (LT GRY) Pin Wire Color Circuit No. Function A LT GRN 24 Backup Lamp Supply Voltage G BLK 850 Ground

Backup Lamp Connector End - Right (Pontiac) Connector Part Information 12160393 2-Way Lamp Socket Wedge Base W3 Right Angle (LT GRY) Pin Wire Color Circuit No. Function A LT GRN 24 Backup Lamp Supply Voltage G BLK 1850 Ground

Cargo Lamp Connector End (Pontiac) Connector Part Information 12047662 2-Way F Metri-Pack 150 Series (BLK) Pin Wire Color Circuit No. Function A ORN 1732 Courtesy Lamps Supply Voltage B GRY/BLK 690 Courtesy Lamp Control

Cargo Lamp Connector End (Buick) Connector Part Information 12047781 3-Way F Metri-Pack 150 Series (BLK) Pin Wire Color Circuit No. Function A ORN 1732 Courtesy Lamps Supply Voltage B BLK 650 Ground C GRY/BLK 690 Courtesy Lamp Control

Center High Mounted Stop Lamp (CHMSL) Connector End Connector Part Information 12047663 2-Way M Metri-Pack 150 Series (BLK) Pin Wire Color Circuit No. Function A WHT 17 Stop Lamp Switch Signal B BLK 650 Ground

Console Compartment Lamp Connector End (Buick) Connector Part Information 12124652 2-Way TPA Wedge Base Pin Wire Color Circuit No. Function A YEL 9732 Console Compartment Lamps Supply Voltage B BLK 150 Ground

Console Compartment Lamp Switch Connector End (Buick) Connector Part Information 12124652 2-Way TPA Wedge Base Pin Wire Color Circuit No. Function A ORN 1732 Courtesy Lamps Supply Voltage B YEL 9732 Console Compartment Lamps Supply Voltage

Daytime Running Lamps (DRL) Ambient Light Sensor Connector End Connector Part Information 12047662 2-Way F Metri-Pack 150 Series (BLK) Pin Wire Color Circuit No. Function A LT GRN/BLK 1137 Ambient Light Sensor Signal B YEL/BLK 1138 Ambient Light Sensor Low Reference

Fog Lamp Connector End - Left Connector Part Information 12020599 2-Way F Metri-Pack 280 Series (BLK) Pin Wire Color Circuit No. Function A PPL 34 Front Fog Lamps Supply Voltage B BLK 1350 Ground

Fog Lamp Connector End - Right Connector Part Information 12020599 2-Way F Metri-Pack 280 Series (BLK) Pin Wire Color Circuit No. Function A PPL 34 Front Fog Lamps Supply Voltage B BLK 1250 Ground

Headlamp Switch Connector End Connector Part Information 15324433 18-Way F SOC (GRN) Pin Wire Color Circuit No. Function 1 PNK 1444 5-Volt Reference 2 PNK/BLK 1597 Interior Lamp Switch On Signal 3 PPL 328 Interior Lamp Defeat Switch Signal 4 BLK 1550 Ground 5-6 - - Not Used 7 ORN 192 Fog Lamp Switch Signal 8 LT BLU 13 Headlamp Switch Park Lamps Signal 9 BRN/WHT 230 Instrument Panel Lamps Dimming Control 10 GRY/BLK 1798 Low Reference 11 - - Not Used 12 GRY 8 Instrument Panel Lamp Supply Voltage 13 PPL 34 Fog Lamps Supply Voltage 14-15 - - Not Used 16 BLK 1450 Ground 17 YEL 10 Headlamp Switch Signal 18 - - Not Used

Headlamp Connector End - High Beam - Left Connector Part Information 12059182 2-Way F Metri-Pack 280 Series Sealed (BLK) Pin Wire Color Circuit No. Function A DK GRN/ WHT 711 Left Headlamp High Beam Supply Voltage B BLK 1350 Ground

Headlamp Connector End - High Beam - Right Connector Part Information 12059182 2-Way F Metri-Pack 280 Series Sealed (BLK) Pin Wire Color Circuit No. Function A LT GRN/BLK 311 Right Headlamp High Beam Supply Voltage B DK BLU 593 DRL Headlamp High Beam Supply Voltage

Headlamp Connector End - Low Beam - Left Connector Part Information 12059180 2-Way F Metri-Pack 280 Series Sealed (GRY) Pin Wire Color Circuit No. Function A YEL 712 Left Headlamp Low Beam Supply Voltage B BLK 1350 Ground

Headlamp Connector End - Low Beam - Right Connector Part Information 12059180 2-Way F Metri-Pack 280 Series Sealed (GRY) Pin Wire Color Circuit No. Function A TAN/WHT 312 Right Headlamp Low Beam Supply Voltage B BLK 150 Ground

I/P Courtesy Lamp Connector End - Left Connector Part Information 12162711 2-Way Metri-Pack 150 Series (BLK) Pin Wire Color Circuit No. Function A ORN 1732 Courtesy Lamps Supply Voltage B GRY/BLK 690 Courtesy Lamp Control

I/P Courtesy Lamp Connector End - Right Connector Part Information 12162711 2-Way Metri-Pack 150 Series (BLK) Pin Wire Color Circuit No. Function A ORN 1732 Courtesy Lamps Supply Voltage B GRY/BLK 690 Courtesy Lamp Control

License Plate Lamp Connector End Connector Part Information 12146418 2-Way Lamp Socket (WHT) Pin Wire Color Circuit No. Function A BRN 9 Park Lamp Supply Voltage (Pontiac) GRN 9 Park Lamp Supply Voltage (Buick) B BLK 450 Ground

C900 Connector End Connector Part Information 12146046 4-Way F Metri-Pack 150 Series (GRY) Pin Wire Color Circuit No. Function A BRN 9 Park Lamp Supply Voltage B LT GRN 24 Backup Lamp Supply Voltage C LT GRN 24 Backup Lamp Supply Voltage D - - Not Used E BLK 1150 Ground

Marker Lamp Connector End - LF (Buick) Connector Part Information 12110053 2-Way F (GRY) Pin Wire Color Circuit No. Function A BRN 9 Headlamp Switch Park Lamps Signal B BLK 1350 Ground

Marker Lamp Connector End - RF (Buick) Connector Part Information 12110053 2-Way F (GRY) Pin Wire Color Circuit No. Function A BRN 9 Headlamp Switch Park Lamps Signal B BLK 1250 Ground

Marker Lamp Connector End - LR (Buick) Connector Part Information 12110053 2-Way F (GRY) Pin Wire Color Circuit No. Function A DK GRN 9 Headlamp Switch Park Lamps Signal B BLK 850 Ground

Marker Lamp Connector End - RR (Buick) Connector Part Information 12110053 2-Way F (GRY) Pin Wire Color Circuit No. Function A DK GRN 9 Headlamp Switch Park Lamps Signal B BLK 1850 Ground

Park/Stop/Turn Signal Lamp Connector End - LR Connector Part Information 12160394 3-Way F Lamp Socket Wedge Base W3 Right Angle (WHT) Pin Wire Color Circuit No. Function A DK GRN/YEL 18 Left Rear Stop/Turn Lamp Supply Voltage B BRN 9 Park Lamp Supply Voltage G BLK 850 Ground

Park/Stop/Turn Signal Lamp Connector End - RR Connector Part Information 12160394 3-Way F Lamp Socket Wedge Base W3 Right Angle (WHT) Pin Wire Color Circuit No. Function A DK GRN/YEL 19 Right Rear Stop/Turn Lamp Supply Voltage B BRN 9 Park Lamp Supply Voltage G BLK 1850 Ground

Park/Turn Signal Lamp Connector End - LF Connector Part Information 12092379 3-Way F Lamp Socket Wedge Base W3 (BLK) Pin Wire Color Circuit No. Function A LT BLU 14 Left Turn Signal Lamps Supply Voltage B BRN 9 Park Lamp Supply Voltage G BLK 1350 Ground

Park/Turn Signal Lamp Connector End - RF Connector Part Information 12092379 3-Way F Lamp Socket Wedge Base W3 (BLK) Pin Wire Color Circuit No. Function A LT BLU 15 Right Turn Signal Lamps Supply Voltage B BRN 9 Park Lamp Supply Voltage G BLK 1250 Ground

Roof Rail Reading Lamp Connector End - Left (C79 or 1SE) Connector Part Information 12047781 3-Way F Metri-Pack 150 Series (BLK) Pin Wire Color Circuit No. Function A BLK 650 Ground B WHT 1732 Courtesy Lamps Supply Voltage C RED 690 Courtesy Lamp Control

Roof Rail Reading Lamp Connector End - Right (C79 or 1SE) Connector Part Information 12047781 3-Way F Metri-Pack 150 Series (BLK) Pin Wire Color Circuit No. Function A BLK 650 Ground B WHT 1732 Courtesy Lamps Supply Voltage C RED 690 Courtesy Lamp Control

Stop Lamp Switch Connector End - C1 Connector Part Information 12033701 2-Way F Metri-Pack 480 Series (GRY) Pin Wire Color Circuit No. Function A ORN 1840 Battery Positive Voltage B WHT 17 Stop Lamp Switch Signal

Stop Lamp Switch Connector End - C2 Connector Part Information 12033706 4-Way F Metri-Pack 280 Series (BLU) Pin Wire Color Circuit No. Function A ORN/BLK 1786 Park/Neutral Signal B DK GRN/ WHT 1135 A/T Shift Lock Control Solenoid Supply Voltage C PNK 1239 Ignition 1 Voltage D PPL 420 TCC Brake Switch/Cruise Release Switch Signal

Tail Lamp Connector End - LR (Buick X2) Connector Part Information 12110053 2-Way F Lamp Socket Wedge BAse Assembly (LT GRY) Indexing May Vary Pin Wire Color Circuit No. Function A LT GRN - Rear Park Lamps Supply Voltage B BLK - Ground

Tail Lamp Connector End - RR (Buick X2) Connector Part Information 12110053 2-Way F Lamp Socket Wedge BAse Assembly (LT GRY) Indexing May Vary Pin Wire Color Circuit No. Function A LT GRN - Rear Park Lamps Supply Voltage B BLK - Ground

Turn Signal/Multifunction Switch Connector End - C1 Connector Part Information 12064862 8-Way F Metri-Pack 150 Series (BLK) Pin Wire Color Circuit No. Function A-B - - Not Used C BLK 1550 Ground D LT BLU/WHT 1414 Turn Signal Switch Left Signal E PNK 539 Ignition 1 Voltage F DK BLU/ WHT 1415 Turn Signal Switch Right Signal G BLK 28 Horn Relay Control H TAN 2144 Hazard Switch Signal

Turn Signal/Multifunction Switch Connector End - C2 Connector Part Information 12059800 5-Way F Metri-Pack 150 Series (BLK) Pin Wire Color Circuit No. Function A BLK/WHT 1969 Headlamp High Beam Relay Control B BLK 1450 Ground C PNK/WHT 1970 Headlamp Low Beam Relay Control D BLK 910 Headlamp Low/High Beam Relay Control E BLK/WHT 1969 Headlamp High Beam Relay Control

Turn Signal/Multifunction Switch C3 Connector End Connector Part Information 15339058 7-Way F Metri-Pack 150 Series (GRY) Pin Wire Color Circuit No. Function G-H - - Not Used J RED 228 Windshield Washer Pump Control K YEL 243 Accessory Voltage L GRY 112 Windshield Wiper Switch Signal 1 M DK GRN 113 Windshield Wiper Switch Signal 2 N PPL 92 Windshield Wiper Motor High Speed

Turn Signal/Multifunction Switch C4 (K34) Connector End Connector Part Information 12047786 4-Way M 150 Series (BLK) Pin Wire Color Circuit No. Function A PNK 39 Ignition 1 Voltage B GRY 397 Cruise Control On Switch Signal C GRY/BLK 87 Cruise Control Resume/Accel Switch Signal D DK BLU 84 Cruise Control Set/Coast Switch Signal

Vanity Mirror Connector End - Left (DH9) Connector Part Information 12047663 2-Way M Metri-Pack 150 Series (BLK) Pin Wire Color Circuit No. Function A GRY 1732 Courtesy Lamps Supply Voltage B BLK 650 Ground

Vanity Mirror Connector End - Right (DH9) Connector Part Information 12047663 2-Way M Metri-Pack 150 Series (BLK) Pin Wire Color Circuit No. Function A GRY 1732 Courtesy Lamps Supply Voltage B BLK 650 Ground

Begin the system diagnosis with Diagnostic System Check - Lighting Systems . The Diagnostic System Check will provide the following information

1. The identification of the control module(s) which command the system.
2. The ability of the control module(s) to communicate through the serial data circuit.
3. The identification of any stored diagnostic trouble codes (DTCs) and their status.

The use of the Diagnostic System Check will identify the correct procedure for diagnosing the system and where the procedure is located.

Test Description

The number(s) below refer to the step number(s) on the diagnostic table.

1. 2: Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.
2. 5: The presence of DTCs which begin with "U" indicate some other module is not communicating. The specified procedure will compile all the available information before tests are performed.

Diagnostic System Check - Lighting Systems

Scan Tool Output Controls

Body Control Module (BCM) Scan Tool Output Controls

Scan Tool Data List

Scan Tool Data List

BCM Scan Tool Data Definitions

The BCM Scan Tool Data Definitions contains a brief description of all Lighting System related BCM parameters available on the scan tool.

Diagnostic Trouble Code (DTC) List

Diagnostic Trouble Code (DTC) List

Circuit Description

The BCM controls the following courtesy lamps when the door switch is ON and an door is opened

1. The instrument panel courtesy lamp, LH
2. The instrument panel courtesy lamp, RH
3. The inside rear view mirror lamps
4. The cargo lamp
5. The roof rail reading lamp, LH
6. The roof rail reading lamp, RH
7. The sunshade lighted vanity mirror lamps, LH
8. The sunshade lighted vanity mirror lamps, LH

The BCM monitors all but the sunshade lighted vanity mirror lamps for a open in the ground circuit.

Conditions for Running the DTC

Voltage supplied to the module is in the normal operating range (approximately 10-16V).

Conditions for Setting the DTC

1. The BCM detects an open in the controlled ground circuit of the courtesy lamps.
2. The condition is present for more then 3 ms.

Action Taken When the DTC Sets

The BCM stores DTC B1354 in memory.

DTC B1354

The BCM controls the dimming operation of the interior lamps. The BCM applies a 12-volt reference signal to the IP dimming switch. When you move the IP dimming switch, the BCM uses this varying voltage signal in order to apply a pulse width modulation (PWM) voltage which controls the brightness of the interior illumination lamps.

1. Voltage supplied to the module is in the normal operating range (approximately 9-16 volts).
2. The interior lamps must be ON.

1. The BCM detects a short to ground or an open in the dimming reference voltage circuit.
2. The condition is present for longer than 3 ms.

The BCM stores DTC B1397 in memory.

Conditions for Clearing the MIL/DTC

1. A current DTC B1397 clears when the BCM no longer detects an open or a short to ground in the dimming reference voltage circuit.
2. A history DTC B1397 clears after 100 consecutive ignition cycles.

Diagnostic Aids

1. If the DTC B1397 is a history DTC, the fault may be intermittent. Refer to «Testing for Intermittent Conditions and Poor Connections»(/buick/rendezvous/i-2001-2007/remont/body-electrical/#wiring-systems-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) in Wiring Systems.
2. An intermittent short to ground or an open in the following locations may cause an intermittent malfunction to occur: The dimming reference voltage circuit The IP dimming switch The body control module (BCM)

The number(s) below refer to the step number(s) on the diagnostic table.

1. 2: This step verifies that the body control module is providing reference voltage to the headlamp switch.
2. 3: This step tests the dimming return circuit for a high resistance or an open.

DTC B1397

The BCM controls the dimming operation of the interior lamps. The BCM applies a 12-volt reference signal to the IP dimming switch. When you move the IP dimming switch, the BCM uses this varying voltage signal in order to apply a pulse width modulation (PWM) voltage in order to control the brightness of the interior illumination lamps

1. Voltage supplied to the module is in the normal operating range (approximately 10-16 volts).
2. The interior lamps must be ON.

1. The BCM detects a short to battery positive voltage in the dimming reference voltage circuit.
2. The condition is present for longer than 3 ms.

The BCM stores DTC B1398 in memory.

1. A current DTC B1398 clears when the BCM no longer detects a short to battery positive voltage in the dimming reference voltage circuit.
2. A history DTC B1398 clears after 100 consecutive ignition cycles.

1. If the DTC B1398 is a history DTC, the fault may be intermittent. Refer to «Testing for Intermittent Conditions and Poor Connections»(/buick/rendezvous/i-2001-2007/remont/body-electrical/#wiring-systems-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) in Wiring Systems.
2. An intermittent short to battery positive voltage in the following locations may cause an intermittent malfunction to occur: The dimming reference voltage circuit The IP dimming switch The body control module (BCM)

The number(s) below refer to the step number(s) on the diagnostic table.

1. 2: This step tests the dimming reference circuit for a short to battery positive voltage.
2. 3: This step tests the dimming return circuit for a short to battery positive voltage.

DTC B1398

When the headlamp switch is turned to the PARK or HEAD position, the body control module (BCM) applies battery positive voltage to the I/P courtesy lamps. When a door is opened, the door latch assembly applies a ground to the BCM. The BCM supplies battery positive voltage to the courtesy lamp supply voltage circuit and applies a ground to the courtesy lamps control circuit.

Voltage supplied to the BCM is in the normal operating range, approximately 9-14 volts.

1. The BCM detects a low when a high is expected in either the instrument panel lamps supply voltage circuit or the courtesy lamp supply voltage circuit.
2. The condition above must be present for more then 0.1 seconds

1. The BCM L Fuse opens.
2. The courtesy lamps are inoperative.
3. The I/P courtesy lamps are inoperative.
4. The BCM stores DTC B1482 in memory.
5. The BCM store DTC B2627 in memory.

1. A current DTC B1482 and B2627 clears when the BCM no longer detects a short to ground in the instrument panel lamps supply voltage circuit or the courtesy lamps supply voltage circuit.
2. A history DTC B1482 and B2627 clears after 100 consecutive ignition cycles.

1. The BCM L Fuse opens when there is a short to ground in either the instrument panel lamps supply voltage circuit or the courtesy lamps supply voltage circuit and must be replaced before doing any diagnostics.
2. If the DTC B1482 or B2627 is a history DTC, the fault may be intermittent. Refer to «Testing for Intermittent Conditions and Poor Connections»(/buick/rendezvous/i-2001-2007/remont/body-electrical/#wiring-systems-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) in Wiring Systems.
3. The following conditions may cause an intermittent malfunction to occur: An intermittent short to ground in the instrument panel lamps supply voltage circuit or the courtesy lamps supply voltage circuit. The BCM is intermittently shorted to ground.

DTC B1482

The BCM controls the operation of the fog lamps. When the park lamps are on, and the fog lamp switch is turned ON, the BCM grounds the control circuit of the fog lamp relay in order to illuminate the fog lamps.

1. Voltage supplied to the module is in the normal operating range (approximately 9-16 volts).
2. The front fog lamp feature is enabled.

1. The BCM detects a short to ground or an open in the control circuit of the fog lamp relay when the fog lamps are not commanded ON.
2. The condition is present for longer than 3 ms.

The BCM stores DTC B2532 in memory.

1. A current DTC B2532 clears when the BCM no longer detects an open or a short to ground in the control circuit of the fog lamp relay.
2. A history DTC B2532 clears after 100 consecutive ignition cycles.
3. A DTC B2532 will clear when commanded by a scan tool.

1. If the DTC B2532 is a history DTC, the fault may be intermittent. Refer to «Testing for Intermittent Conditions and Poor Connections»(/buick/rendezvous/i-2001-2007/remont/body-electrical/#wiring-systems-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) in Wiring Systems.
2. An intermittent short to ground or an open in the following locations may cause an intermittent malfunction to occur: The control circuit of the fog lamps relay The fog lamps relay The body control module (BCM)

DTC B2532

The BCM controls the operation of the fog lamps. When the park lamps are on, and the fog lamp switch is turned ON, the BCM grounds the control circuit of the fog lamps relay in order to illuminate the fog lamps.

1. Voltage supplied to the module is in the normal operating range (approximately 9-16 volts).
2. The front fog lamp feature is enabled.

1. The BCM detects a short to battery positive voltage in the control circuit of the fog lamps relay when the fog lamps are commanded ON.
2. The condition is present for longer than 3 ms.

The BCM stores DTC B2533 in memory.

1. A current DTC B2533 clears when the BCM no longer detects a short to battery positive voltage in the control circuit of the fog lamps relay.
2. A history DTC B2533 clears after 100 consecutive ignition cycles when the condition is no longer present.
3. A DTC B2533 will clear when commanded by a scan tool.

1. If the DTC B2533 is a history DTC, the fault may be intermittent. Refer to «Testing for Intermittent Conditions and Poor Connections»(/buick/rendezvous/i-2001-2007/remont/body-electrical/#wiring-systems-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) in Wiring Systems.
2. An intermittent short to voltage in the following locations may cause an intermittent malfunction to occur: The control circuit of the fog lamps relay The fog lamps relay The body control module (BCM)

DTC B2533

The body control module (BCM) controls the backup lamp relay. The BCM grounds the backup lamp relay control circuit energizing the backup lamp relay. The BCM connects directly to the center console fuse block with no external wiring between them.

Any of the following conditions may be present.

1. The transaxle is not in the REVERSE position.
2. The ignition switch is not in the OFF position.

1. The fault code will set when the backup lamp relay control circuit is inactive and a short to ground or open is present.
2. The condition above must be present for more than 0.3 seconds.

The backup lamps will not illuminate, or will remain ON.

Conditions for Clearing the DTC

1. A current DTC will clear if the BCM no longer detects a short to ground or open in the backup lamp relay control circuit.
2. A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.
3. Current and history DTCs can be cleared when the BCM receives a clear code command from a scan tool.

1. If the DTC is a history DTC, the fault may be intermittent. Refer to «Testing for Intermittent Conditions and Poor Connections»(/buick/rendezvous/i-2001-2007/remont/body-electrical/#wiring-systems-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) in Wiring Systems.
2. The following conditions may cause an intermittent malfunction to occur: An intermittent short to ground or open in the backup lamp control circuit. The backup lamp relay coil is intermittently shorted to ground or open. The BCM is intermittently shorted to ground or open.

The numbers below refer to the step numbers on the diagnostic table.

1. 4: Tests if ground is constantly being applied to the backup lamp relay.

DTC B2552

The body control module (BCM) controls the backup lamp relay. The BCM grounds the backup lamps relay control circuit energizing the backup lamp relay. The BCM connects directly to the center console fuse block with no external wiring between them.

1. The transaxle must be in the REVERSE position.
2. The ignition switch must not be in the OFF position.

1. The BCM detects a short to voltage in the backup lamp relay control circuit when the BCM tries to energize the backup lamp relay.
2. The condition above must be present for more than 0.3 seconds.

The backup lamps will not illuminate.

1. A current DTC will clear when the BCM no longer detects a short to battery in the backup lamp relay control circuit.
2. A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.
3. Current and history DTCs can be cleared when the BCM receives a clear code command from a scan tool.

1. If the DTC is a history DTC, the fault may be intermittent. Refer to «Testing for Intermittent Conditions and Poor Connections»(/buick/rendezvous/i-2001-2007/remont/body-electrical/#wiring-systems-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) in Wiring Systems.
2. The following conditions may cause an intermittent malfunction to occur: An intermittent short to battery in backup lamp relay control circuit. The backup lamp relay coil is intermittently shorted to the battery. The BCM is intermittently shorted to the battery.

The numbers below refer to the step numbers on the diagnostic table.

1. 3: Verifies that the BCM or backup lamp relay is at fault.

DTC B2553

The body control module (BCM) controls the headlamp relay by grounding the control circuit of the headlamp.

Voltage supplied to the module is in the normal operating voltage range (approximately 9-16 volts).

1. The BCM detects a short to ground or an open in the control circuit of the headlamp relay coil or the low beam headlamp control circuit relay when the BCM is not energizing the headlamp relay.
2. The condition is present for more than 3 ms.

1. The BCM stores DTC B2577 in memory.
2. The SERVICE VEHICLE SOON telltale illuminates.
3. With the ignition in the RUN position, the BCM deactivates the daytime running lamps and turns on the park lamps.

1. A current DTC B2577 clears if the BCM no longer detects a short to ground or an open in the control circuit of the headlamp relay control circuit of the low beam relay headlamp control circuit.
2. A history DTC B2577 clears after 100 consecutive ignition cycles.
3. The BCM receives the Clear Code commend from the scan tool.

1. If the DTC B2577 is a history DTC, the fault may be intermittent. Refer to «Testing for Intermittent Conditions and Poor Connections»(/buick/rendezvous/i-2001-2007/remont/body-electrical/#wiring-systems-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) in Wiring Systems.
2. An intermittent short to ground or an open in the following locations may cause an intermittent malfunction to occur: The low beam headlamp relay control circuit The headlamp relay control circuit The headlamp relay The BCM

DTC B2577

The body control module (BCM) controls the headlamp relay by grounding the control circuit of the headlamp relay coil.

1. Voltage supplied to the module is in the normal operating voltage range (approximately 10-16 volts).
2. The headlamps must be ON.

1. The BCM detects a short to voltage in the headlamp relay control circuit or the low beam headlamp relay control circuit when the BCM energizes the headlamp relay.
2. The condition must be present for more than 3 ms.

1. The BCM stores DTC B2578 in memory.
2. The SERVICE VEHICLE SOON telltale illuminates.
3. The BCM activates the daytime running lamps.

1. A current DTC B2578 clears if the BCM no longer detects a short to battery positive voltage in the low beam headlamp relay control circuit or the headlamp relay control circuit.
2. A history DTC B2578 clears after 100 consecutive ignition cycles.
3. The BCM receives the clear code commend from the scan tool.

1. If the DTC B2578 is a history DTC, the fault may be intermittent. Refer to «Testing for Intermittent Conditions and Poor Connections»(/buick/rendezvous/i-2001-2007/remont/body-electrical/#wiring-systems-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) in Wiring Systems.
2. An intermittent short to voltage in the following locations may cause an intermittent malfunction to occur: The headlamp relay control circuit The headlamp relay The BCM

DTC B2578

The body control module (BCM) controls the park lamp relay by grounding the control circuit of the park lamp relay when the headlamp switch is turned to the PARK or the HEAD position. This energizes the park lamp relay, illuminating the park lamps.

Voltage supplied to the module is in the normal operating range (approximately 10-16 volts).

1. The BCM detects a short to ground or an open in the control circuit of the park lamp relay coil when the BCM is not commanding the park lamps ON.
2. The condition must be present for more than 3 ms.

The BCM stores DTC B2587 in memory.

1. A current DTC B2587 clears if the BCM no longer detects a short to ground or an open in the control circuit of the park lamp relay.
2. A history DTC B2587 clears after 100 consecutive ignition cycles.
3. The BCM receives the Clear Code commend from the scan tool.

1. If the DTC B2587 is a history DTC, the fault may be intermittent. Refer to «Testing for Intermittent Conditions and Poor Connections»(/buick/rendezvous/i-2001-2007/remont/body-electrical/#wiring-systems-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) in Wiring Systems.
2. An intermittent short to ground or an open in the following locations may cause an intermittent malfunction to occur: The control circuit of the park lamp relay The park lamp relay The BCM

DTC B2587

The body control module (BCM) controls the park lamp relay by grounding the control circuit of the park lamp relay when the headlamp switch is turned to the PARK or the HEAD position. This energizes the park lamp relay, illuminating the park lamps.

Voltage supplied to the module is in the normal operating range (approximately 10-16 volts).

1. The BCM detects a short to battery positive voltage in the control circuit of the park lamp relay when the BCM is commanding the park lamps ON.
2. The condition must be present for more than 3 ms.

The BCM stores DTC B2588 in memory.

1. A current DTC B2588 clears when the BCM no longer detects a short to battery positive voltage in the control circuit of the park lamp relay.
2. A history DTC B2588 clears after 100 consecutive ignition cycles.
3. The BCM receives the Clear Code commend from the scan tool.

1. If the DTC B2588 is a history DTC, the fault may be intermittent. Refer to «Testing for Intermittent Conditions and Poor Connections»(/buick/rendezvous/i-2001-2007/remont/body-electrical/#wiring-systems-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) in Wiring Systems.
2. An intermittent short to battery positive voltage in the following locations may cause an intermittent malfunction to occur: The control circuit of the park lamp relay The park lamp relay The BCM

DTC B2588

The body control module (BCM) controls the DRL relay by grounding the control circuit of the DRL relay coil.

1. Voltage supplied to the module is in the normal operating voltage range (approximately 10-16 volts).
2. The DRL feature must be enabled.

1. The BCM detects a short to ground or an open in the control circuit of the DRL relay coil when the daytime running lamps are inactive.
2. The condition must be present for more than 3 ms.

1. The BCM stores DTC B2602 in memory.
2. The BCM may store DTC B3857 in memory.
3. The SERVICE VEHICLE SOON telltale illuminates.

1. A current DTC B2602 clears if the BCM no longer detects a short to ground or an open in the control circuit of the DRL relay coil.
2. A current DTC B3857 clears if the BCM no longer detects a short to ground in the DRL relay control circuit.
3. A history DTC B2602 clears after 100 consecutive ignition cycles.
4. The BCM receives the Clear Code commend from the scan tool.

1. If the DTC B2602 is a history DTC, the fault may be intermittent. Refer to «Testing for Intermittent Conditions and Poor Connections»(/buick/rendezvous/i-2001-2007/remont/body-electrical/#wiring-systems-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) in Wiring Systems.
2. An intermittent short to ground or an open in the following locations may cause an intermittent malfunction to occur: The control circuit of the DRL relay coil The DRL relay The BCM

DTC B2602

The body control module (BCM) controls the DRL relay by grounding the control circuit of the DRL relay coil.

1. Voltage supplied to the module is in the normal operating voltage range (approximately 10-16 volts).
2. The DRL feature must be enabled.
3. The DRLs must be commanded ON.

1. The BCM detects a short to battery positive voltage in the control circuit of the DRL relay coil when the DRLs are ON.
2. The condition above must be present for more than 3 ms.

1. The BCM stores DTC B2603 in memory.
2. The SERVICE VEHICLE SOON telltale illuminates.

1. A current DTC B2603 clears if the BCM no longer detects a short to battery positive voltage in the control circuit of the DRL relay coil.
2. A history DTC B2603 clears after 100 consecutive ignition cycles.
3. The BCM receives the Clear Code commend from the scan tool.

1. If the DTC B2603 is a history DTC, the fault may be intermittent. Refer to «Testing for Intermittent Conditions and Poor Connections»(/buick/rendezvous/i-2001-2007/remont/body-electrical/#wiring-systems-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) in Wiring Systems.
2. An intermittent short to voltage in the following locations may cause an intermittent malfunction to occur: The control circuit of the DRL relay coil The DRL relay The BCM

DTC B2603

The body control module (BCM) uses a varying voltage signal from the IP dimmer switch in order to determine the rate of pulse width modulation of the control circuit of the illumination lamps. The pulse width modulation rate determines the brightness of the illumination lamps.

Voltage supplied to the module is in the normal operating range (approximately 10-16 volts).

1. The BCM detects one of the following conditions: A short to voltage in the 12-volt reference circuit of the IP dimmer switch. A short to voltage in the dimming circuit of the IP dimmer switch. An open in the low reference circuit of the IP dimmer switch.
2. The condition is present for longer than 1.0 second.

1. The BCM stores DTC B2613 in memory.
2. The illumination lamps remain at full brightness until the code is cleared.

1. A current DTC B2613 clears when the BCM no longer detects one of the above conditions.
2. A history DTC B2613 clears after 100 consecutive ignition cycles.
3. The BCM receives the Clear Code commend from the scan tool.

1. If the DTC B2613 is a history DTC, the fault may be intermittent. Refer to «Testing for Intermittent Conditions and Poor Connections»(/buick/rendezvous/i-2001-2007/remont/body-electrical/#wiring-systems-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) in Wiring Systems.
2. An intermittent condition in the following locations may cause an intermittent malfunction to occur: The 12-volt reference circuit of the IP dimmer switch, the signal circuit of the IP dimmer switch, or the low reference circuit of the IP dimmer switch The IP dimmer switch The BCM

DTC B2613

The BCM controls the following lamps when the IP dimmer switch is ON or any door is opened

1. The instrument panel courtesy lamp, LH
2. The instrument panel courtesy lamp, RH
3. The inside rear view mirror lamps
4. The cargo lamp
5. The roof rail reading lamp, LH
6. The roof rail reading lamp, RH
7. The sunshade lighted vanity mirror lamps, LH
8. The sunshade lighted vanity mirror lamps, RH

The BCM monitors all but the sunshade lighted vanity mirror lamps for a short to ground or a short to voltage.

Voltage supplied to the module is in the normal operating range (approximately 10-16 volts).

1. The BCM detects a short to ground in the courtesy lamps supply voltage circuit of the interior lamps when the dimmer switch is in the OFF position, and the doors are not open.
2. The condition is present for more than 3 ms.

The BCM stores DTC B2617 in memory.

1. A current DTC B2617 clears if the BCM no longer detects a short to ground.
2. A history DTC B2617 clears after 100 consecutive ignition cycles.
3. The BCM receives the Clear Code commend from the scan tool.

1. If the DTC B2617 is a history DTC, the fault may be intermittent. Refer to «Testing for Intermittent Conditions and Poor Connections»(/buick/rendezvous/i-2001-2007/remont/body-electrical/#wiring-systems-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) in Wiring Systems.
2. An intermittent short to ground in the following locations may cause an intermittent malfunction to occur: The courtesy lamps supply voltage circuit The BCM

DTC B2617

The BCM controls the following lamps when the IP dimmer switch is ON or any door is opened

1. The instrument panel courtesy lamp, LH
2. The instrument panel courtesy lamp, RH
3. The inside rear view mirror lamps
4. The cargo lamp
5. The roof rail reading lamp, LH
6. The roof rail reading lamp, RH
7. The sunshade lighted vanity mirror lamps, LH
8. The sunshade lighted vanity mirror lamps, RH

The BCM monitors all but the sunshade lighted vanity mirror lamps for a short to ground or a short to battery positive voltage.

Voltage supplied to the module is in the normal operating range (approximately 10-16 V).

1. The BCM detects a short to voltage in the courtesy lamps supply voltage circuit of the interior lamps when the dimmer switch is in the ON position or the doors are open.
2. The condition is present for more than 3 ms.

The BCM stores DTC B2618 in memory.

1. A current DTC B2618 clears if the BCM no longer detects a short to battery positive voltage.
2. A history DTC B2618 clears after 100 consecutive ignition cycles.
3. The BCM receives the Clear Code commend from the scan tool.

1. If the DTC B2618 is a history DTC, the fault may be intermittent. Refer to «Testing for Intermittent Conditions and Poor Connections»(/buick/rendezvous/i-2001-2007/remont/body-electrical/#wiring-systems-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) in Wiring Systems.
2. An intermittent short to voltage in the following locations may cause an intermittent malfunction to occur: The courtesy lamps supply voltage circuit of the interior lamps The BCM

DTC B2618

When the headlamp switch is turned to the PARK or HEAD position, the body control module (BCM) applies battery positive voltage to the I/P courtesy lamps. When a door is opened, the door latch assembly applies a ground to the BCM. The BCM supplies battery positive voltage to the courtesy lamp supply voltage circuit and applies a ground to the courtesy lamps control circuit.

Voltage supplied to the BCM is in the normal operating range, approximately 9-14 volts.

1. The BCM detects a low when a high is expected in either the instrument panel lamps supply voltage circuit or the courtesy lamp supply voltage circuit.
2. The condition above must be present for more then 0.1 seconds

1. The BCM L Fuse opens.
2. The courtesy lamps are inoperative.
3. The I/P courtesy lamps are inoperative.
4. The BCM stores DTC B1482 in memory.
5. The BCM store DTC B2627 in memory.

1. A current DTC B1482 and B2627 clears when the BCM no longer detects a short to ground in the instrument panel lamps supply voltage circuit or the courtesy lamps supply voltage circuit.
2. A history DTC B1482 and B2627 clears after 100 consecutive ignition cycles.

1. The BCM L Fuse opens when there is a short to ground in either the instrument panel lamps supply voltage circuit or the courtesy lamps supply voltage circuit and must be replaced before doing any diagnostics.
2. If the DTC B1482 or B2627 is a history DTC, the fault may be intermittent. Refer to «Testing for Intermittent Conditions and Poor Connections»(/buick/rendezvous/i-2001-2007/remont/body-electrical/#wiring-systems-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) in Wiring Systems.
3. The following conditions may cause an intermittent malfunction to occur: An intermittent short to ground in the instrument panel lamps supply voltage circuit or the courtesy lamps supply voltage circuit. The BCM is intermittently shorted to ground.

DTC B2627

The BCM controls the illumination of the following lamps through pulse width modulation when the park lamps or the headlamps are ON

1. The automatic transmission control position illumination lamp
2. The left glass window release switch illumination lamp
3. The electronic traction control switch illumination lamp
4. The door lock theft deterrent defeat switch illumination lamp
5. The heater A/C control switch illumination lamp
6. The instrument cluster illumination lamps
7. The headlamp switch illumination lamp
8. The radio switches illumination lamps
9. The driver information display switch illumination lamp
10. The heated seat switch illumination lamp
11. The door lock switches illumination lamps
12. The window switches illumination lamps
13. The steering wheel controls illumination lamps

Voltage supplied to the module is in the normal operating range (approximately 10-16 volts).

1. The BCM detects a short to voltage in the instrument panel lamps supply voltage circuit. When the park lamps or the headlamps are on, and the dimmer switch is in the OFF position.
2. The condition is present for more than 3 ms.

The BCM stores DTC B2628 in memory.

1. A current DTC B2628 clears if the BCM no longer detects a short to battery positive voltage in the instrument panel lamps supply voltage circuit of the illumination lamps.
2. A history DTC B2628 clears after 100 consecutive ignition cycles if the condition is no longer present.
3. The BCM receives the Clear Code command from the scan tool.

1. If the DTC B2628 is a history DTC, the fault may be intermittent. Refer to «Testing for Intermittent Conditions and Poor Connections»(/buick/rendezvous/i-2001-2007/remont/body-electrical/#wiring-systems-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) in Wiring Systems.
2. An intermittent short to voltage in the following conditions may cause an intermittent malfunction to occur: The instrument panel lamps supply voltage circuit of the illumination lamps The BCM

DTC B2628

The body control module (BCM) uses the ambient light sensor signal in order to control the daytime running lamp system. The ambient light sensor is connected to the BCM through the signal circuit and the reference circuit of the ambient light sensor.

1. Voltage supplied to the module is in the normal operating range (approximately 10-16 volts).
2. The DRL feature must be enabled.

1. The BCM detects a short to battery positive voltage in the ambient light sensor reference voltage circuit.
2. The condition is present for longer than 3 ms.

1. The BCM stores DTC B2645 in memory.
2. The SERVICE VEHICLE SOON telltale illuminates.

1. A current DTC B2645 clears when the BCM no longer detects an short to battery positive voltage in the ambient light sensor reference voltage circuit.
2. A history DTC B2645 clears after 100 consecutive ignition cycles.

1. If the DTC B2645 is a history DTC, the fault may be intermittent. Refer to «Testing for Intermittent Conditions and Poor Connections»(/buick/rendezvous/i-2001-2007/remont/body-electrical/#wiring-systems-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) in Wiring Systems.
2. An intermittent short to battery positive voltage in the following locations may cause an intermittent malfunction to occur: The ambient light sensor reference voltage circuit The ambient light sensor The body control module (BCM)

The number below refers to the step number on the diagnostic table.

1. 2: This step tests the ambient light sensor reference voltage circuit for a short to battery positive voltage.

DTC B2645

The body control module (BCM) uses the ambient light sensor signal in order to control the daytime running lamps system. The ambient light sensor is connected directly to the BCM through the signal circuit and the reference circuit of the ambient light sensor.

1. Voltage supplied to the module is in the normal operating range (approximately 10-16 volts).
2. The DRL feature must be enabled.

1. The BCM detects a short to ground or a short to battery positive voltage in the signal circuit of the DRL ambient light sensor.
2. The BCM detects a short to ground in the low reference circuit of the DRL ambient light sensor.
3. The condition must be present for more than 1.0 second.

1. The BCM stores DTC B2647 in memory.
2. The SERVICE VEHICLE SOON telltale illuminates.
3. The headlamps, the park lamps, the tail lamps and the marker lamps illuminate to night intensity.

1. The BCM no longer detects a fault in the signal circuit of the DRL ambient light sensor for more than 1.0 second.
2. The BCM no longer detects a fault in the low reference circuit of the DRL ambient light sensor for more than 1.0 second.
3. A history DTC B2647 clears after 100 consecutive ignition cycles.
4. The BCM receives the Clear Code command from the scan tool.

1. If the DTC B2647 is a history DTC, the fault may be intermittent. Refer to «Testing for Intermittent Conditions and Poor Connections»(/buick/rendezvous/i-2001-2007/remont/body-electrical/#wiring-systems-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) in Wiring Systems.
2. The following conditions may cause an intermittent malfunction to occur: An intermittent short to ground or a short to battery positive voltage in the signal circuit of the DRL ambient light sensor. An intermittent short to ground in the low reference circuit of the DRL ambient light sensor. An intermittent internal short to ground in the ambient light sensor. An intermittent internal short to ground in the BCM.

The number(s) below refer to the step number(s) on the diagnostic table.

1. 3: This step tests for the proper operation of the circuit in the high voltage range.
2. 4: This step tests for the proper operation of the circuit in the low voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to voltage.

DTC B2647

The body control module (BCM) uses the ambient light sensor signal to control the daytime running lamps system. The ambient light sensor is connected directly to the BCM.

1. Voltage supplied to the module is in the normal operating voltage range (approximately 10-16 volts).
2. The DRL feature must be enabled.

1. The BCM detects a short to battery positive voltage or an open the DRL ambient light sensor low reference circuit.
2. The BCM detects a open in the ambient light sensor signal circuit.
3. The condition must be present for more than 1.0 second.

1. The BCM stores DTC B2648 in memory
2. The SERVICE VEHICLE SOON telltale illuminates
3. The headlamps, the park lamps, the tail lamps and the marker lamps illuminate to low light intensity

1. A current DTC B2648 clears when the BCM no longer detects the fault in the signal circuit or the low reference circuit of the DRL ambient light sensor.
2. A history DTC B2648 clears after 100 consecutive ignition cycles.
3. The BCM receives the Clear Code command from the scan tool.

1. If the DTC B2648 is a history DTC, the fault may be intermittent. Refer to «Testing for Intermittent Conditions and Poor Connections»(/buick/rendezvous/i-2001-2007/remont/body-electrical/#wiring-systems-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) in Wiring Systems.
2. An intermittent short to voltage or an open in the following locations may cause an intermittent malfunction to occur: The low reference circuit of the DRL ambient light sensor The sensor circuit of the DRL ambient light sensor. The ambient light sensor The BCM

DTC B2648

The headlamp switch provides a direct ground input into the body control module (BCM) for the headlamp switch input when the switch is activated. This input is used by the BCM in order to control the headlamps when the headlamp switch is in the HEAD position.

1. Voltage supplied to the module is in the normal operating range (approximately 10-16 volts).
2. The headlamps must be ON.

The BCM detects a short to ground in the headlamps signal circuit of the headlamp switch when the headlamp switch is in the HEAD position.

The BCM stores DTC B2665 in memory.

1. A current DTC B2665 clears if the BCM no longer detects a short to ground.
2. A history DTC B2665 clears after 100 consecutive ignition cycles.
3. The BCM receives the Clear Code command from the scan tool.

1. If the DTC B2665 is a history DTC, the fault may be intermittent. Refer to «Testing for Intermittent Conditions and Poor Connections»(/buick/rendezvous/i-2001-2007/remont/body-electrical/#wiring-systems-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) in Wiring Systems.
2. An intermittent short to ground in the following locations may cause an intermittent malfunction to occur: The headlamps signal circuit of the headlamp switch The headlamp switch The BCM

DTC B2665

The BCM controls the fog lamps by grounding the coil side of the fog lamp relay when the fog lamp switch is pressed momentarily.

Voltage supplied to the module is in the normal operating range (approximately 10-16 volts).

1. The BCM detects a short to ground in the signal circuit of the fog lamp switch when the fog lamps are ON.
2. The condition must be present for at least 60 seconds.

1. The BCM stores B2742 in memory.
2. The fog lamps will not operate.

1. A current DTC B2742 clears when the BCM no longer detects a short to ground in the signal circuit of the fog lamp switch.
2. A history DTC B2742 clears after 100 consecutive ignition cycles.
3. The BCM receives the Clear Code command from the scan tool.

1. If the DTC B2742 is a history DTC, the fault may be intermittent. Refer to «Testing for Intermittent Conditions and Poor Connections»(/buick/rendezvous/i-2001-2007/remont/body-electrical/#wiring-systems-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) in Wiring Systems.
2. An intermittent short to ground in the following locations may cause an intermittent malfunction to occur: The signal circuit of the fog lamp switch The fog lamp switch The BCM

DTC B2742

The body control module (BCM) monitors the activity of the park lamp relay switch with the headlamp switch in either the PARK position or the HEAD position.

Voltage supplied to the module is in the normal operating voltage range (approximately 10-16 volts).

The BCM detects an open or a short to ground in the park lamp supply voltage circuit with the headlamp switch in either the PARK position or the HEAD position.

The BCM stores DTC B3840 in memory.

1. A current DTC B3840 clears if the BCM no longer detects an open or a short to ground.
2. A history DTC B3840 clears after 100 consecutive ignition cycles.
3. The BCM receives the clear code command from the scan tool.

1. If the DTC B3840 is a history DTC, the fault may be intermittent. Refer to «Testing for Intermittent Conditions and Poor Connections»(/buick/rendezvous/i-2001-2007/remont/body-electrical/#wiring-systems-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) in Wiring Systems.
2. An intermittent open or short to ground in the following locations may cause an intermittent malfunction to occur: The park lamp supply voltage circuit The park lamp relay The BCM

DTC B3840

The body control module (BCM) monitors the activity of the park lamp relay switch with the headlamp switch in either the PARK position or the HEAD position.

Voltage supplied to the module is in the normal operating voltage range (approximately 10-16 volts).

The BCM detects a short to voltage in the park lamp supply voltage circuit when the headlamp switch is in the OFF position.

The BCM stores DTC B3841 in memory.

1. A current DTC B3841 clears if the BCM no longer detects a short to battery positive voltage.
2. A history DTC B3841 clears after 100 consecutive ignition cycles.
3. The BCM receives the clear code command from the scan tool.

1. If the DTC B3841 is a history DTC, the fault may be intermittent. Refer to «Testing for Intermittent Conditions and Poor Connections»(/buick/rendezvous/i-2001-2007/remont/body-electrical/#wiring-systems-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) in Wiring Systems.
2. An intermittent short to battery positive voltage in the following locations may cause an intermittent malfunction to occur: The park lamp supply voltage circuit The park lamp relay The BCM

DTC B3841

The body control module (BCM) monitors the high beam headlamp signal circuit by verifying the high beam input.

1. Voltage supplied to the module is in the normal operating voltage range (approximately 10-16 volts).
2. The high beam headlamps must be ON.

1. The BCM detects a short to voltage, short to ground or an open in the high beam headlamp signal circuit.
2. The condition must be present for more than 3 ms.

1. The BCM stores DTC B3857 in memory.
2. The SERVICE VEHICLE SOON telltale illuminates.

1. A current DTC B3857 will clear if the BCM no longer detects a short to battery voltage, short to ground or an open in the high beam headlamp signal circuit.
2. A history DTC B3857 will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.
3. A DTC B3857 will clear when commanded by a scan tool.

1. If the DTC B3857 is a history DTC, the fault may be intermittent. Refer to «Testing for Intermittent Conditions and Poor Connections»(/buick/rendezvous/i-2001-2007/remont/body-electrical/#wiring-systems-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) in Wiring Systems.
2. The following conditions may cause an intermittent malfunction to occur: An intermittent short to voltage in the high beam headlamp signal circuit. An intermittent short to ground in the high beam headlamp signal circuit. An intermittent open in the high beam headlamp signal circuit. An intermittent short to voltage in the BCM.

The numbers below refer to the step numbers on the diagnostic table.

1. 2: Test for a short to battery positive voltage in the high beam headlamp signal circuit.
2. 3: Test for a short to ground or an open in the high beam headlamp signal circuit.

DTC B3857

The engine control module (ECM) monitors the stop lamp switch signal circuit and the torque converter clutch (TCC) brake switch/cruise control release signal circuit every 100 ms. The ECM monitors the status of the stop lamp switch signal circuit and the TCC brake switch/cruise control signal circuit to see if they match when the brake pedal is pressed or released.

The ignition is ON.

The status of the stop lamp switch input to the ECM, and the TCC brake switch/cruise control input to the ECM do not match for at least 2 seconds continuously, for 10 occurrences. Each time the signals match then do not match a counter increments. When the counter reaches 10 the DTC will set.

When DTC P0504 is set the following will occur

1. The cruise control is disabled.
2. The ECM will function as if the brake pedal is not pressed.
3. The control module stores the DTC information into memory when the diagnostic runs and fails.
4. The malfunction indicator lamp (MIL) will not illuminate.
5. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.

1. The DTC will clear when the status of the stop lamp switch input to the ECM, and the TCC brake switch/cruise control input to the ECM match for at least 2 seconds continuously for both the pressed position and the released position.
2. A current DTC Last Test Failed clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
4. Clear the DTC with a scan tool.

1. Inspect for proper adjustment of the stop lamp switch. Refer to «Stop Lamp Switch Adjustment»(/buick/rendezvous/i-2001-2007/remont/exterior-lights/#lighting-systems__stop-lamp-switch-adjustment) .
2. Check for internments and poor connections. Refer to «Testing for Intermittent Conditions and Poor Connections»(/buick/rendezvous/i-2001-2007/remont/body-electrical/#wiring-systems-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) in Wiring Systems

DTC P0504

1. Perform «Diagnostic System Check - Lighting Systems»(/buick/rendezvous/i-2001-2007/remont/exterior-lights/#lighting-systems) before using the Symptom Tables in order to verify that all of the following are true: No DTCs are set. The control module can communicate via the serial data link.
2. Review the system operation in order to familiarize yourself with the system functions. Refer to «Exterior Lighting Systems Description and Operation»(/buick/rendezvous/i-2001-2007/remont/exterior-lights/#lighting-systems) and «Interior Lighting Systems Description and Operation»(/buick/rendezvous/i-2001-2007/remont/exterior-lights/#lighting-systems) .

Visual/Physical Inspection

1. Inspect for aftermarket devices which could affect the operation of the Lighting System. Refer to «Checking Aftermarket Accessories»(/buick/rendezvous/i-2001-2007/remont/body-electrical/#wiring-systems-diagnostic-information-and-procedures__checking-aftermarket-accessories) in Wiring Systems.
2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittent

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

Symptom List

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

1. «Backup Lamps Always On»(/buick/rendezvous/i-2001-2007/remont/exterior-lights/#lighting-systems__backup-lamps-always-on)
2. «Backup Lamps Inoperative»(/buick/rendezvous/i-2001-2007/remont/exterior-lights/#lighting-systems__backup-lamps-inoperative)
3. «Courtesy Lamps Inoperative»(/buick/rendezvous/i-2001-2007/remont/exterior-lights/#lighting-systems__courtesy-lamps-inoperative)
4. «Courtesy Lamps Always On»(/buick/rendezvous/i-2001-2007/remont/exterior-lights/#lighting-systems__courtesy-lamps-always-on)
5. «Daytime Running Lamps (DRL) Inoperative»(/buick/rendezvous/i-2001-2007/remont/exterior-lights/#lighting-systems__daytime-running-lamps-drl-inoperative)
6. «Fog Lamps Always On»(/buick/rendezvous/i-2001-2007/remont/exterior-lights/#lighting-systems__fog-lamps-always-on)
7. «Fog Lamps Inoperative»(/buick/rendezvous/i-2001-2007/remont/exterior-lights/#lighting-systems__fog-lamps-inoperative)
8. «Hazard Lamps Inoperative»(/buick/rendezvous/i-2001-2007/remont/exterior-lights/#lighting-systems__hazard-lamps-inoperative)
9. «Hazard Lamps Always On»(/buick/rendezvous/i-2001-2007/remont/exterior-lights/#lighting-systems__hazard-lamps-always-on)
10. «Headlamps Always On - Low or High Beam»(/buick/rendezvous/i-2001-2007/remont/exterior-lights/#lighting-systems__headlamps-always-on-low-or)
11. «Headlamps Inoperative - Low Beams»(/buick/rendezvous/i-2001-2007/remont/exterior-lights/#lighting-systems__headlamps-inoperative-low-beams)
12. «Headlamps Inoperative - High Beams»(/buick/rendezvous/i-2001-2007/remont/exterior-lights/#lighting-systems__headlamps-inoperative-high-beams)
13. «Headlamps Inoperative - Low and High Beams»(/buick/rendezvous/i-2001-2007/remont/exterior-lights/#lighting-systems__headlamps-inoperative-low-and-high)
14. «High Beam Indicator Inoperative»(/buick/rendezvous/i-2001-2007/remont/exterior-lights/#lighting-systems__high-beam-indicator-inoperative)
15. «Interior Backlighting Inoperative»(/buick/rendezvous/i-2001-2007/remont/exterior-lights/#lighting-systems__interior-backlighting-inoperative)
16. «Illuminated Entry Lamps Inoperative»(/buick/rendezvous/i-2001-2007/remont/exterior-lights/#lighting-systems__illuminated-entry-lamps-inoperative)
17. «Interior Lamps Off Switch Inoperative»(/buick/rendezvous/i-2001-2007/remont/exterior-lights/#lighting-systems__interior-lamps-off-switch-inoperative)
18. «Park Lamp Out Indicator Inoperative»(/buick/rendezvous/i-2001-2007/remont/exterior-lights/#lighting-systems__park-lamp-out-indicator-inoperative)
19. «Park Lamps Always On»(/buick/rendezvous/i-2001-2007/remont/exterior-lights/#lighting-systems__park-lamps-always-on)
20. «Park Lamps Inoperative»(/buick/rendezvous/i-2001-2007/remont/exterior-lights/#lighting-systems__park-lamps-inoperative)
21. «Park Lamps Inoperative - Output at Trailer/Upfitter Connector»(/buick/rendezvous/i-2001-2007/remont/exterior-lights/#lighting-systems__park-lamps-inoperative-output-at)
22. «Reading Lamp(s) Inoperative»(/buick/rendezvous/i-2001-2007/remont/exterior-lights/#lighting-systems__reading-lamps-inoperative)
23. «Stop Lamps Always On»(/buick/rendezvous/i-2001-2007/remont/exterior-lights/#lighting-systems__stop-lamps-always-on)
24. «Stop Lamps Inoperative»(/buick/rendezvous/i-2001-2007/remont/exterior-lights/#lighting-systems__stop-lamps-inoperative)
25. «Turn Signal Lamps and/or Indicators Inoperative»(/buick/rendezvous/i-2001-2007/remont/exterior-lights/#lighting-systems__turn-signal-lamps-andor-indicators-inoperative)
26. «Turn Signal Lamps Inoperative - Output at Trailer/Upfitter Connector»(/buick/rendezvous/i-2001-2007/remont/exterior-lights/#lighting-systems__turn-signal-lamps-inoperative-output)

Backup Lamps Always On

Backup Lamps Always On

Backup Lamps Inoperative

Backup Lamps Inoperative

Courtesy Lamps Always On

Courtesy Lamps Always On

Courtesy Lamps Inoperative

Courtesy Lamps Inoperative

Daytime Running Lamps (DRL) Inoperative

Daytime Running Lamps (DRL) Inoperative

Fog Lamps Always On

Fog Lamps Always On

Fog Lamps Inoperative

Fog Lamps Inoperative

Hazard Lamps Always On

Hazard Lamps Always On

Hazard Lamps Inoperative

Hazard Lamps Inoperative

Headlamps Always On - Low or High Beam

Headlamps Always On - Low or High Beam

Headlamps Inoperative - High Beams

Headlamps Inoperative - High Beams

Headlamps Inoperative - Low Beams

Headlamps Inoperative - Low Beams

Headlamps Inoperative - Low and High Beams

Headlamps Inoperative - Low and High Beams

High Beam Indicator Inoperative

High Beam Indicator Inoperative

Illuminated Entry Lamps Inoperative

Illuminated Entry Lamps Inoperative

Interior Backlighting Inoperative

Interior Backlighting Inoperative

Interior Lamps Off Switch Inoperative

Interior Lamps Off Switch Inoperative

Park Lamps Always On

Park Lamps Always On

Park Lamps Inoperative

Park Lamps Inoperative

Park Lamp Out Indicator Inoperative

Park Lamp Out Indicator Inoperative

Park Lamps Inoperative - Output at Trailer/Upfitter Connector

Park Lamps Inoperative - Output at Trailer/Upfitter Connector

Reading Lamp(s) Inoperative

Reading Lamp(s) Inoperative

Stop Lamps Always On

Stop Lamps Always On

Stop Lamps Inoperative

Stop Lamps Inoperative

Turn Signal Lamps and/or Indicators Inoperative

Turn Signal Lamps and/or Indicators Inoperative

Turn Signal Lamps Inoperative - Output at Trailer/Upfitter Connector

Turn Signal Lamps Inoperative - Output at Trailer/Upfitter Connector

Stop Lamp Switch Adjustment

Note. Proper stoplamp switch adjustment is essential. Improper stoplamp switch adjustment may cause brake drag, heat buildup and excessive brake lining wear.

1. Insert the stop lamp switch and the cruise control switch if equipped into the brake pedal bracket (2).
2. Install the stop lamp switch and the cruise control switch (3) if equipped into the slotted grooves until the switches are fully depressed against the brake pedal, then turn the switches clockwise approximately 1/4 turn, the switches should now be installed and adjusted.
3. Inspect the stop lamps and the cruise control for proper operation.

Removal Procedure

1. Remove the left side instrument panel insulator. Refer to «Closeout/Insulator Panel Replacement - Left»(/buick/rendezvous/i-2001-2007/remont/gauges-instrument-panels/#instrument-panel-system-displays-gauges-and-console) in Instrument Panel, Gages and Console.
2. Disconnect the electrical connectors.
3. Remove the stop lamp switch (1) from the brake pedal bracket by turning the switch counterclockwise approximately 1/4 turn, and pulling back.

Installation Procedure

1. Install the stop lamp switch (1) into the slotted grooves until switch is fully depressed against the brake pedal (2), then turn the switch clockwise approximately 1/4 turn, the switch should now be installed and adjusted.
2. Connect the electrical connectors.
3. Install the left side instrument panel insulator. Refer to «Closeout/Insulator Panel Replacement - Left»(/buick/rendezvous/i-2001-2007/remont/gauges-instrument-panels/#instrument-panel-system-displays-gauges-and-console) in Instrument Panel, Gages and Console.
4. If necessary, adjust the stop lamp switch. Refer to «Stop Lamp Switch Adjustment»(/buick/rendezvous/i-2001-2007/remont/exterior-lights/#lighting-systems__stop-lamp-switch-adjustment) .

1. Remove the instrument panel (I/P) cluster trim plate bezel. Refer to «Trim Plate Bezel Replacement - Instrument Panel (I/P) Cluster (Aztek)»(/buick/rendezvous/i-2001-2007/remont/gauges-instrument-panels/#instrument-panel-system-displays-gauges-and-console) or «Trim Plate Bezel Replacement - Instrument Panel (I/P) Cluster (Rendezvous)»(/buick/rendezvous/i-2001-2007/remont/gauges-instrument-panels/#instrument-panel-system-displays-gauges-and-console) in Instrument Panel, Gages and Console.
2. Grasp the headlamp switch and pull firmly to release the retaining tabs from the I/P carrier.
3. Disconnect the electrical connector from the headlamp switch.
4. Remove the headlamp switch.

1. Connect the electrical connector to the headlamp switch.
2. Position the headlamp switch to the retainers in the I/P carrier.
3. Install the headlamp switch to the I/P carrier. Press the switch into place until fully seated.
4. Install the I/P l cluster trim plate bezel. Refer to «Trim Plate Bezel Replacement - Instrument Panel (I/P) Cluster (Aztek)»(/buick/rendezvous/i-2001-2007/remont/gauges-instrument-panels/#instrument-panel-system-displays-gauges-and-console) or «Trim Plate Bezel Replacement - Instrument Panel (I/P) Cluster (Rendezvous)»(/buick/rendezvous/i-2001-2007/remont/gauges-instrument-panels/#instrument-panel-system-displays-gauges-and-console) in Instrument Panel, Gages and Console.

1. Remove the instrument panel (I/P) cluster trim plate bezel. Refer to «Trim Plate Bezel Replacement - Instrument Panel (I/P) Cluster (Aztek)»(/buick/rendezvous/i-2001-2007/remont/gauges-instrument-panels/#instrument-panel-system-displays-gauges-and-console) or «Trim Plate Bezel Replacement - Instrument Panel (I/P) Cluster (Rendezvous)»(/buick/rendezvous/i-2001-2007/remont/gauges-instrument-panels/#instrument-panel-system-displays-gauges-and-console) in Instrument Panel, Gages and Console.
2. Grasp the fog lamp switch and pull firmly to release the retaining tabs from the I/P carrier.
3. Disconnect the electrical connector from the fog lamp switch.
4. Remove the fog lamp switch.

1. Connect the electrical connector to the fog lamp switch.
2. Position the fog lamp switch to the retainers in the I/P carrier.
3. Install the fog lamp switch to the I/P carrier. Press the switch into place until fully seated.
4. Install the I/P cluster trim plate bezel. Refer to «Trim Plate Bezel Replacement - Instrument Panel (I/P) Cluster (Aztek)»(/buick/rendezvous/i-2001-2007/remont/gauges-instrument-panels/#instrument-panel-system-displays-gauges-and-console) or «Trim Plate Bezel Replacement - Instrument Panel (I/P) Cluster (Rendezvous)»(/buick/rendezvous/i-2001-2007/remont/gauges-instrument-panels/#instrument-panel-system-displays-gauges-and-console) in Instrument Panel, Gages and Console.

1. Remove the instrument panel upper trim pad. Refer to «Trim Pad Replacement - Instrument Panel (I/P) Upper (Aztek)»(/buick/rendezvous/i-2001-2007/remont/gauges-instrument-panels/#instrument-panel-system-displays-gauges-and-console) or «Trim Pad Replacement - Instrument Panel (I/P) Upper (Rendezvous)»(/buick/rendezvous/i-2001-2007/remont/gauges-instrument-panels/#instrument-panel-system-displays-gauges-and-console) in Instrument Panel, Gages and Console.
2. Remove the daytime running lamp ambient light sensor socket from instrument panel trim pad by twisting 1/4 turn counterclockwise.
3. Remove the daytime running lamp ambient light sensor from the daytime running lamp ambient light connector.

1. Install the Daytime running lamp ambient light sensor to the daytime running lamp ambient light sensor socket.
2. Install the daytime running lamp ambient light sensor socket to instrument panel trim pad twisting 1/4 turn clockwise.
3. Install the instrument panel upper trim pad. Refer to «Trim Pad Replacement - Instrument Panel (I/P) Upper (Aztek)»(/buick/rendezvous/i-2001-2007/remont/gauges-instrument-panels/#instrument-panel-system-displays-gauges-and-console) or «Trim Pad Replacement - Instrument Panel (I/P) Upper (Rendezvous)»(/buick/rendezvous/i-2001-2007/remont/gauges-instrument-panels/#instrument-panel-system-displays-gauges-and-console) in Instrument Panel, Gages and Console.

1. Remove the fuse panel cover from the right side floor console.
2. Remove the hazard and turn signal flasher from the fuse panel.

1. Install the hazard and turn signal flasher into the fuse panel.
2. Install the fuse panel cover.

1. Gently pry the lens from the bulb housing.
2. Release the locking tabs in order to remove the bulb and socket from the lens.
3. Pull the bulb straight out of the socket.

1. Install the bulb to the socket.
2. Carefully snap the lens into position.

1. Remove the left instrument panel insulator. Refer to «Closeout/Insulator Panel Replacement - Left»(/buick/rendezvous/i-2001-2007/remont/gauges-instrument-panels/#instrument-panel-system-displays-gauges-and-console) in Instrument Panel, Gages and Console.
2. Remove the instrument panel courtesy lamp socket, turning counterclockwise.
3. Remove the bulb from the instrument panel courtesy lamp socket.

1. Install the bulb to the instrument panel courtesy lamp socket.
2. Install the instrument panel courtesy lamp socket turning clockwise.
3. Install the left instrument panel insulator. Refer to «Closeout/Insulator Panel Replacement - Left»(/buick/rendezvous/i-2001-2007/remont/gauges-instrument-panels/#instrument-panel-system-displays-gauges-and-console) in Instrument Panel, Gages and Console.

1. Remove the right instrument panel insulator. Refer to «Closeout/Insulator Panel Replacement - Right»(/buick/rendezvous/i-2001-2007/remont/gauges-instrument-panels/#instrument-panel-system-displays-gauges-and-console) in Instrument Panel, Gages and Console.
2. Remove the instrument panel courtesy lamp socket, turning counterclockwise.
3. Remove the bulb from the instrument panel courtesy lamp socket.

1. Install the bulb to the instrument panel courtesy lamp socket.
2. Install the instrument panel courtesy lamp socket turning clockwise.
3. Install the right instrument panel insulator. Refer to «Closeout/Insulator Panel Replacement - Right»(/buick/rendezvous/i-2001-2007/remont/gauges-instrument-panels/#instrument-panel-system-displays-gauges-and-console) in Instrument Panel, Gages and Console.

Scheme 29

1. Open the instrument panel compartment door.
2. Using a small flat-bladed tool depress retainers on instrument panel compartment lamp switch.
3. Remove the instrument panel compartment lamp switch from the instrument panel compartment.
4. Disconnect the electrical connector from the instrument panel compartment lamp switch.
5. Pull the bulb from the instrument panel compartment lamp switch socket.

1. Press the bulb into the instrument panel compartment lamp switch socket.
2. Connect the electrical connector to the instrument panel compartment lamp switch.
3. Align the instrument panel compartment lamp switch into instrument panel compartment.
4. Install the instrument panel compartment lamp switch. Press the instrument panel compartment lamp switch until retainers are fully seated.

1. Lower the sunshade and raise the mirror and the lamp cover (the door).
2. Insert a small flat-bladed tool at the lower edge of the vanity mirror lamp lens then press down to release the lens.
3. Remove the vanity mirror lamp lens from the sunshade.
4. Remove the bulb from the socket.

1. Install the bulb into the socket.
2. Position the vanity mirror lamp lens to the sunshade. Align the lens tabs into the housing slots and insert the upper edge of the lens first.
3. Insert a small flat-bladed tool at the lower edge of the vanity mirror lamp lens then press up to fully install the lens.
4. Close the lamp cover door and raise the sunshade.

1. Open the hood.
2. Disconnect the headlamp retainer, by pulling up.
3. Pull the headlamp from the lower center corner, in order to release the ball studs from the grommet retainers.
4. Remove the headlamp from the upper fascia support.
5. Disconnect the electrical connector from the headlamp.
6. Remove the headlamp from the vehicle.
7. Remove the rubber access cover from the headlamp for the bulb you are replacing, if required.
8. Remove the headlamp bulb from the socket, turning counterclockwise.
9. Remove the headlamp bulb from the socket, if required.

1. Install the headlamp bulb into the socket, if required. Press into place until fully seated.
2. Install the headlamp bulb to the socket, turning clockwise.
3. Install the rubber access cover to the headlamp for the bulb you are replacing, if required.
4. Connect the electrical connector to the headlamp.
5. Position the headlamp electrical connector into the access hole in the upper fascia support.
6. Position the headlamp vertical retainer into the slot.
7. Position the headlamp retainer through hole in the upper fascia support.
8. Position the headlamp ball studs into the grommet retainers.
9. Position the headlamp rubber outer seal to properly fit into the front bumper fascia.
10. Press the headlamp into place until fully seated.
11. Inspect the headlamp for proper fit.
12. Install the headlamp vertical retainer, by sliding downward until fully seated.
13. Check the headlamp aim, if a new headlamp was installed, or if service or repairs in the front end area were made. Refer to «Headlamp Aiming (Aztek)»(/buick/rendezvous/i-2001-2007/remont/exterior-lights/#lighting-systems) or «Headlamp Aiming (Rendezvous)»(/buick/rendezvous/i-2001-2007/remont/exterior-lights/#lighting-systems) .
14. Close the hood.

1. Open the hood.
2. Remove the thumb screw from the back of the headlamp.
3. Release the headlamp retainer by lifting up.
4. Pull the headlamp straight forward, to release the ball stud from the grommet.
5. Remove the headlamp from the upper fascia support.
6. Disconnect the electrical connector from the headlamp.
7. Remove the bulb(s) from the headlamp by rotating counterclockwise.
8. Release the headlamp trim tabs from the headlamp, if required.
9. Remove the headlamp trim from the headlamp, pulling to release the adhesive tape.
10. Clean adhesive from the headlamp trim and headlamp using 3M™ adhesive remover P/N 8984, or equivalent.

1. Install new adhesive tape 3M™ P/N 6382 or equivalent to the headlamp trim, if necessary.
2. Position the headlamp trim to the headlamp, if removed.
3. Install the headlamp trim to the headlamp, pressing until end tabs are fully seated.
4. Install the headlamp bulb(s) to the headlamp by rotating clockwise.
5. Connect the electrical connector to the headlamp.
6. Position the headlamp to the upper fascia support.
7. Press the headlamp into the upper fascia support until the ball stud is fully seated.
8. Install the thumb screw to the rear of the headlamp.
9. Engage the headlamp vertical retainer, by sliding downward until fully seated.
10. Check the headlamp aim, if a new headlamp was installed, or if service or repairs in the front end area were made. Refer to «Headlamp Aiming (Aztek)»(/buick/rendezvous/i-2001-2007/remont/exterior-lights/#lighting-systems) or «Headlamp Aiming (Rendezvous)»(/buick/rendezvous/i-2001-2007/remont/exterior-lights/#lighting-systems) .
11. Close the hood.

Aiming Headlamps (Visual Aim)

Headlamp aim should be checked

1. When a new headlamp capsule is installed
2. If service or repairs to the front end area have (or may have) disturbed the headlamps or their mounting

1. The area will consist of a level surface large enough to allow for a vehicle and an additional 7.62 m (25 feet) measured from face of lamps to the front of the aiming screen.
2. The screen will be 1.52 m (5 ft) high x 3.66 m (12 ft) wide with a matte white surface well shaded from extraneous light, and properly adjusted to the floor on which the vehicle stands. Provisions may be made for moving the screen so it can be aligned parallel with the vehicle.
3. The screen shall be provided with a fixed vertical centerline, two laterally adjustable vertical tapes, and one vertically adjustable horizontal tape.
4. If a regular commercial aiming screen is not available, the screen may consist of a vertical wall having a clear uninterrupted area approximately 1.83 m (6 ft) high and 3.66 m (12 ft) wide. The surface should be finished with a washable non-gloss white paint.
5. After the aiming screen has been set up in its permanent location, it is necessary to paint a reference line on the floor directly under the lens of the lamps to indicate the proper location of the headlamps when they are being aimed: Distance between headlamps (1) Center line of screen (2) Adjustable vertical pointer (3) Adjustable horizontal tape (4) Diagram of light screen (5) Vertical center line ahead of right headlamp pointer position (6) 7.62 m (25 ft) (7) Car axis (8) Adjustable vertical pointer Horizontal center line of lamps Vertical center line ahead of left headlamp

Prior to aiming the headlamps, the following steps must be taken

1. Remove any snow, ice or mud from the vehicle.
2. The vehicle must have a full tank of gas.
3. Stop all other work on the vehicle.
4. If any service has been performed on the vehicle, make sure that all of the components are back in their original place.
5. The vehicle must be on a level surface.
6. The vehicle left tires must be aligned with the reference line extending from the screen with the headlamps aligned with the reference line.
7. Do not load any cargo in the vehicle.
8. The vehicle must contain one person or 72.56 kg (160 lb) on the driver's seat.
9. Inflate the tires to the proper pressure.
10. Simulate the vehicle loads if the intended use of the vehicle is for hauling heavy loads or towing a trailer.
11. Rock the vehicle in order to stabilize the suspension.
12. Turn on the headlamps to low beam and observe the left and the top edges of the high intensity zone on the screen. The edges of the high intensity zone should fall within the specifications.

Scheme 30

1. Open the hood.
2. Measure from the floor to the center of the headlamp bulb. (Some headlamps have an aim dot marked on the headlamp lens).
3. At the screen, measure from the floor and place the horizontal tape at the measured distance.
4. Measure from the reference line on the floor to the left headlamp bulb centerline.
5. At the screen, measure from the reference line and place the vertical tape at the measured distance.
6. Measure from the reference line on the floor to the right headlamp bulb centerline.
7. At the screen, measure from the reference line and place the vertical tape at the measured distance.
8. Turn on the low beam headlamps and block the light from projecting onto the screen from the passenger side headlamp.
9. Adjust the vertical aim of the headlamps to the specifications required by the state and the local authorities, or as shown in step number 8.
10. Rotate the headlamp adjuster (1) to change the vertical aim of the headlamp.
11. Repeat the aiming procedure for the passenger side headlamp while blocking the light from projecting onto the screen from the driver side headlamp.
12. Close the hood.

Headlamp aim should be checked

1. When a new headlamp capsule is installed
2. If service or repairs to the front end area have, or may have disturbed the headlamps or their mounting

1. The area will consist of a level surface large enough to allow for a vehicle and an additional 7.62 m (25 feet) measured from face of lamps to the front of the aiming screen.
2. The screen will be 1.52 m (5 ft) high x 3.66 m (12 ft) wide with a matte white surface well shaded from extraneous light, and properly adjusted to the floor on which the vehicle stands. Provisions may be made for moving the screen so it can be aligned parallel with the vehicle.
3. The screen shall be provided with a fixed vertical centerline, two laterally adjustable vertical tapes, and one vertically adjustable horizontal tape.
4. If a regular commercial aiming screen is not available, the screen may consist of a vertical wall having a clear uninterrupted area approximately 1.83 m (6 ft) high and 3.66 m (12 ft) wide. The surface should be finished with a washable non-gloss white paint.
5. After the aiming screen has been set up in its permanent location, it is necessary to paint a reference line on the floor directly under the lens of the lamps to indicate the proper location of the headlamps when they are being aimed: Distance between headlamps (1) Center line of screen (2) Adjustable vertical pointer (3) Adjustable horizontal tape (4) Diagram of light screen (5) Vertical center line ahead of right headlamp pointer position (6) 7.62 m (25 ft) (7) Car axis (8) Adjustable vertical pointer Horizontal center line of lamps Vertical center line ahead of left headlamp

Prior to aiming the headlamps, the following steps must be taken

1. Remove any snow, ice or mud from the vehicle.
2. The vehicle must have a full tank of gas.
3. Stop all other work on the vehicle.
4. If any service has been performed on the vehicle, make sure that all of the components are back in their original place.
5. The vehicle must be on a level surface.
6. The vehicle left tires must be aligned with the reference line extending from the screen with the headlamps aligned with the reference line.
7. Do not load any cargo in the vehicle.
8. The vehicle must contain one person or 72.56 kg (160 lb) on the drivers seat.
9. Inflate the tires to the proper pressure.
10. Simulate the vehicle loads if the intended use of the vehicle is for hauling heavy loads or towing a trailer.
11. Rock the vehicle in order to stabilize the suspension.
12. Turn ON the headlamps to low beam and observe the left and the top edges of the high intensity zone on the screen. The edges of the high intensity zone should fall within the specifications.

Headlamp Aiming Procedure

1. Open the hood.
2. Measure from the floor to the center of the headlamp bulb. Some headlamps have an aim dot marked on the headlamp lens.
3. At the screen, measure from the floor and place the horizontal tape at the measured distance.
4. Measure from the reference line on the floor to the left headlamp bulb centerline.
5. At the screen, measure from the reference line and place the vertical tape at the measured distance.
6. Measure from the reference line on the floor to the right headlamp bulb centerline.
7. At the screen, measure from the reference line and place the vertical tape at the measured distance.
8. Turn ON the low beam headlamps and block the light from projecting onto the screen from the passenger side headlamp.
9. Adjust the vertical aim of the headlamps to the specifications required by the state and the local authorities, or as shown in step number 8.
10. Rotate the headlamp adjuster (1) to change the vertical aim of the headlamp.
11. Repeat the aiming procedure for the passenger side headlamp while blocking the light from projecting onto the screen from the driver side headlamp.
12. Close the hood.

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/rendezvous/i-2001-2007/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
2. Disconnect the electrical connector from the fog lamp.
3. Remove the nuts from the fog lamp.
4. Remove the fog lamp from the front bumper fascia.
5. Remove the fog lamp bulb from the fog lamp, turning counterclockwise, if required.

1. Install the fog lamp bulb to the fog lamp, turning clockwise, if required.
2. Install the fog lamp to the front bumper fascia.
3. Install the fog lamp nuts to the fog lamp. Tighten: Tighten the fog lamp nuts to 10 N.m (89 lb in).
4. Connect the electrical connector to the fog lamp.
5. Lower the vehicle.
6. Check and adjust the fog lamp aim as necessary. Refer to «Fog Lamp Aiming Procedure»(/buick/rendezvous/i-2001-2007/remont/exterior-lights/#lighting-systems__fog-lamp-aiming-procedure) .

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/rendezvous/i-2001-2007/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
2. Remove the fog lamp socket from the fog lamp by rotating counterclockwise.
3. Disconnect the fog lamp electrical connector from the fog lamp socket, if required.
4. Remove the fog lamp nuts (2) from the fog lamp.
5. Remove the fog lamp from the front bumper fascia.

1. Position the fog lamp to the front bumper fascia.
2. Install the fog lamp nuts (2) to the fog lamp. Tighten: Tighten the fog lamp nuts to 10 N.m (89 lb in).
3. Connect the fog lamp electrical connector to the fog lamp socket, if removed.
4. Install the fog lamp socket (3) to the fog lamp by rotating clockwise.
5. Lower the vehicle.
6. Check and adjust the fog lamp aim as necessary. Refer to «Fog Lamp Aiming Procedure»(/buick/rendezvous/i-2001-2007/remont/exterior-lights/#lighting-systems__fog-lamp-aiming-procedure) .

Fog Lamp Aiming Procedure

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

1. Completely assemble all of the components on the vehicle.
2. Place the vehicle on a level surface.
3. Stop all unnecessary operations or work that could affect the ride height of the vehicle.
4. Close the doors and verify that the luggage compartment is empty.
5. Stabilize the suspension by rocking the vehicle sideways.
6. Ensure that the fuel level is 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 lbs) is in the vehicle driver seat.

Aiming Procedure

1. Park the vehicle 7.6 m (25 ft) away from the target screen.
2. Measure from the center of the fog lamp to the ground line. Using this measurement, mark the horizontal centerline (2) of the fog lamp on the target screen directly in front of the vehicle.
3. Turn ON the fog lamps. The top of the fog lamp beam image (4) on the target screen should be 102 mm (4 in) below the center of the fog lamp lens height.
4. Reach under the rear lower edge of the front fascia to access the fog lamp vertical adjustment nut (1).
5. Adjust the fog lamp as required, using the adjusting nut (1) on the bottom of the fog lamp.
6. Turn OFF the fog lamps.

1. Open the hood.
2. Remove the screws from the front parking/sidemarker lamp.
3. Disconnect the front parking/sidemarker lamp wiring harness from the pinch-weld flange.
4. Remove the front parking/sidemarker lamp from the front fender.
5. Remove the front parking/sidemarker lamp socket, depressing the locking tab and turning counterclockwise.
6. Remove the bulb from the front parking/sidemarker lamp socket, if replacing the bulb.

1. Install the bulb to the front parking/sidemarker lamp socket, if replacing the bulb.
2. Install the front parking/sidemarker lamp socket, turning the socket clockwise until the locking tab is fully seated.
3. Connect the front parking/sidemarker lamp wiring harness to the pinch-weld flange.
4. Align the ball stud of the front parking/sidemarker lamp to the grommet in the fender reinforcement.
5. Position the alignment pins of the front parking/sidemarker lamp to the to the holes in the fender reinforcement.
6. Install the front parking/sidemarker lamp to the front fender, pressing into place until fully seated.
7. Install the screws to the front parking/sidemarker lamp. Tighten: Tighten the front parking/sidemarker lamp screws to 2 N.m (18 lb in).
8. Close the hood.

1. Open the hood.
2. Remove the front parking/sidemarker lamp socket, depressing the locking tab and turning counterclockwise.
3. Remove the bulb from the front parking/sidemarker lamp socket, if replacing the bulb.

1. Install the bulb to the front parking/sidemarker lamp socket, if replacing the bulb.
2. Install the front parking/sidemarker lamp socket, turning the socket clockwise until the locking tab is fully seated.
3. Close the hood.

1. Remove the screws from the high mounted stop lamp.
2. Remove the high mounted stop lamp from the roof panel.
3. Disconnect the electrical connector from the high mounted stop lamp.
4. Remove the high mounted stop lamp plastic retainer nuts from the roof panel, using a small flat-bladed tool.

1. Install the high mounted stop lamp plastic retainer nuts to the roof panel pressing into place until fully seated.
2. Connect the electrical connector to the high mounted stop lamp.
3. Position the high mounted stop lamp retainer tabs to the slots in the roof panel. Press the high mounted stop lamp in place until fully seated.
4. Install the screws to the high mounted stop lamp. Tighten: Tighten the high mounted stop lamp screws to 3.5 N.m (31 lb in).

1. Remove the screws from the high mounted stop lamp.
2. Remove the high mounted stop lamp from the roof panel.
3. Disconnect the electrical connector from the high mounted stop lamp.
4. Remove the high mounted stop lamp from the roof panel.

1. Position the high mounted stop lamp to the roof panel.
2. Connect the electrical to the high mounted stop lamp.
3. Install the high mounted stop lamp screws to the high mounted stop lamp. Tighten: Tighten the high mounted stop lamp screws to 3.5 N.m (31 lb in).

1. Use a small flat-bladed tool in order to remove the rear cargo lamp from the rear upper garnish molding.
2. Disconnect the electrical connectors from the rear cargo lamp.
3. Remove the rear cargo lamp from the rear upper garnish molding.
4. Use a small flat-bladed tool in order to remove the cargo lamp lens from the cargo lamp.
5. Use a small flat-bladed tool in order to remove the bulb from the socket.

1. Press the bulb into the socket.
2. Install the rear cargo lamp lens into the rear cargo lamp, pressing into place fully seated.
3. Connect the electrical connectors to the rear cargo lamp.
4. Install the rear cargo lamp into the rear upper garnish molding, pressing into place until fully seated.

1. Remove the lift gate applique. Refer to «Liftgate Applique Replacement»(/buick/rendezvous/i-2001-2007/remont/exterior-body-panels/#body-rear-end) in Body Rear End.
2. Remove the backup lamp bulb/sockets from the applique by rotating counterclockwise.
3. Remove the backup lamp bulbs from the socket, if required.

1. Install the backup lamp bulbs to the socket, if removed.
2. Install the backup lamp bulb/socket to the applique by rotating clockwise.
3. Install the lift gate applique. Refer to «Liftgate Applique Replacement»(/buick/rendezvous/i-2001-2007/remont/exterior-body-panels/#body-rear-end) in Body Rear End.

1. Remove the license plate.
2. Remove the screws from the license plate lamp.
3. Remove the license plate lamp from the end gate.
4. Remove the license plate lamp socket, turning counterclockwise.
5. Remove the bulb from the license plate lamp socket.

1. Install the bulb to the license plate lamp socket.
2. Install the license plate lamp socket, turning clockwise.
3. Install the license plate lamp to the end gate.
4. Install the screws to the license plate lamp. Tighten: Tighten the screws to the license plate lamp to 2 N.m (18 lb in).
5. Install the license plate.

1. Remove the rear lift gate applique. Refer to «Liftgate Applique Replacement»(/buick/rendezvous/i-2001-2007/remont/exterior-body-panels/#body-rear-end) in Body Rear End.
2. Remove the license plate lamp from the applique by pulling rearward from the applique.
3. Remove the license plate lamp socket, turning counterclockwise.
4. Remove the license plate lamp bulb from the license plate lamp socket, if necessary.

1. Install the license plate lamp bulb to the license plate lamp socket, if removed.
2. Install the license plate lamp socket to the license lamp, turning clockwise.
3. Install the license plate lamp to the rear lift gate applique, pressing until fully seated.
4. Install the rear lift gate applique. Refer to «Liftgate Applique Replacement»(/buick/rendezvous/i-2001-2007/remont/exterior-body-panels/#body-rear-end) in Body Rear End.

1. Open the liftgate.
2. Remove the screws from the tail lamp.
3. Pull the tail lamp rearward to disengage it from the ball stud retainers.
4. Disconnect the electrical connector from the tail lamp wiring harness.
5. Remove the tail lamp and backup lamp sockets, depressing the locking tab and rotating counterclockwise.
6. Remove the side marker lamp socket from the tail lamp by rotating counterclockwise.
7. Remove the bulbs from the tail lamp, backup lamp and/or side marker lamp sockets.

1. Install the bulbs to the tail lamp, backup lamp and/or side marker lamp sockets.
2. Install the tail lamp and/or backup lamp sockets to the tail lamp, rotating clockwise until the locking tab is fully seated.
3. Install the side marker lamp socket to the tail lamp, rotating clockwise until fully seated.
4. Connect the electrical connector to the tail lamp wiring harness.
5. Position the tail lamp ball stud retainers to the rear body panel.
6. Press the tail lamp to the rear body panel until fully seated.
7. Install the tail lamp screws to the tail lamp. Tighten: Tighten the tail lamp screws to 2 N.m (18 lb in).
8. Close the liftgate.

1. Open the liftgate.
2. Remove the screws from the tail amp.
3. Slide the tail lamp rearward in order to disengage it from the retainers on the rear body panel.
4. Disconnect the electrical connector from the tail lamp wiring harness.
5. Remove the tail lamp and side marker lamp sockets from the tail lamp, depressing the locking tab and turning counterclockwise.
6. Remove the bulbs from the tail lamp and the side marker lamp sockets, if replacing the bulbs.

1. Install the bulbs to the tail lamp and side marker lamp sockets, if removed.
2. Install the tail lamp and side marker lamp sockets to the tail lamp, turning clockwise until the locking tab is fully seated.
3. Connect the tail lamp electrical connector to the wiring harness.
4. Position the tail lamp retainer slots to the tabs on the rear body panel.
5. Install the tail lamp to the rear body panel, pressing into place until fully seated.
6. Install the tail lamp screws to the taillamp. Tighten: Tighten the tail lamp screws to 2 N.m (18 lb in).
7. Close the liftgate.

1. Using a small, flat-bladed tool, remove the cover of the coat hook access hole from the roof side rail lamp.
2. Using a small, flat-bladed tool, remove the cover from the lamp.
3. Remove the screws from the lamp.
4. Remove the lamp from the roof.
5. Disconnect the electrical connectors from the lamp.

1. Connect the electrical connectors to the roof side rail lamp.
2. Install the lamp to the roof.
3. Install the screws to the lamp. Tighten: Tighten the screws to 2 N.m (18 lb in).
4. Install the cover to the lamp.
5. Install the cover of the coat hook access hole on the lamp.

Exterior Lamps

The exterior lighting consist of the following lamps

1. The headlamps
2. The daytime running lamps (DRL)
3. The fog lamps
4. The park, tail, licence and marker lamps
5. The turn signal lamps
6. The stop lamps
7. The backup lamps

Headlamps

The headlamps may be turned on two different ways. First, when the driver places the headlamp switch is placed in the ON position, for normal operation. Second, with the headlamp switch placed in the OFF position, for automatic lamp control (ALC). During ALC control the headlamps will be in day time running lamp (DRL) operation in daylight conditions, or low beam operation in low light conditions.

Voltage is applied at all times to the coil side and the switched side of both the HDLP Low Beam relay and the HDLP High Beam relay. When the headlamp switch is in the HEAD position, a ground signal is applied from G201 to the headlamp switch. The headlamp switch supplies the ground circuit to the BCM. The BCM then applies a ground through the headlamp relay control circuit to the headlamp dimmer switch. Depending on the switch position, the ground circuit is applied to the coil side of either the HDLP Low beam relay or the HDLP High beam relay. This energizes the coil and closes the switch. Depending on the headlamp switch position, voltage is then applied through the relay to the Low Beam LT and Low Beam RT Fuse or to the High Beam LT and High Beam RT fuse. Voltage is then supplied to the respected headlamps. The left headlamp receives it ground circuit from G101 and the right headlamp high beam receives it ground circuit from G100.

If the headlight switch is left in the ON position, the inadvertent power control feature will turn off the headlights approximately 30 seconds after the ignition switch is turned to the OFF position. If the driver places the headlight switch in the ON position after the ignition switch has been turned OFF, or if the ignition switch is in the ACCY position, the headlights will remain on until turned off or the battery runs dead.

Headlamps On Warning

The radio activates the headlamps on warning as requested by the body control module (BCM). The BCM sends a class 2 message to the radio indicating the chime frequency (fast rate) and duration (continuous). The headlamps on warning sounds when the following occurs

1. The ignition is OFF.
2. The BCM determines that the driver's door is open (signal is low).
3. The BCM determines that the headlamp switch is in the park or head position.

Daytime Running Lamps (DRL)

The ambient light sensor is a light sensitive transistor that varies its voltage signal to the body control module (BCM) in response to changes to the outside (ambient) light level. When the BCM receives this signal it will either turn on the daytime running lamps (DRL) or the headlight relay for auto headlamp operation. Any function or condition that turns on the headlights will cancel the daytime running lamps operation. The daytime running lamps (DRL) illuminate the high beam headlights at a reduced intensity. With the headlight switch in the OFF position, the headlights will either be turned ON or OFF, after an approximate 30 second delay depending on whether daylight or low light conditions are sensed. Voltage is applied at all times to both the switched and coil side of the DRL relay. When the ambient light sensor detects a low light condition, the BCM applies a ground to the DRL relay control circuit. This energizes the relay and applies voltage to the DRL fuse. Current flows from the DRL fuse to the right high beam lamp to the left hand high beam lamp. The high beam headlamps are now in series, and split the voltage. The headlamps illuminate at half intensity. The ground is provided from G101. The DRL operate when the ignition switch is in the RUN position, and the parking brake is not set or the transmission is not in park. When these conditions have been met and the ambient light sensor indicates daytime conditions, the DRL will illuminate.

Fog Lamps

With the ignition switch in the ON position, and the park lamps or low beam headlights on, the fog lights will illuminate when the driver presses the fog lamp switch. The FOG LPS fuse in the underhood fuse block, supplies battery positive voltage to both the fog lamp relay switch contacts and the fog lamp relay coil circuit. The fog lamp relay coil is controlled by the body control module (BCM). When the fog lamp switch is pressed, the BCM fog lamp switch input is grounded. The BCM will then energize the fog lamp relay coil control circuit. The current flow is now from the fog lamp relay to both front fog lamps and to ground G100 and G101. The state of the fog lamps either ON or OFF will remain the same until the front fog lamp switch is pressed again, or the ignition switch is cycled OFF and ON. The park lamps or low beam headlights must be ON in order for the fog lights to be illuminated. Fog lamp operation will be cancelled whenever the park lamps, are turned OFF or the high beam headlights have been selected.

Park, Tail and Marker Lamps

The park, tail and marker lamps, including the license lamps, are turned on when the headlamp switch is placed in either the PARK or HEADLAMP position, or anytime the headlights are requested. The PARK LPS fuse in the underhood fuse block, supplies battery positive voltage to both the park lamp relay switch contacts and park lamp relay coil circuit. The park lamp relay coil is controlled by the body control module (BCM). When the headlamp switch is placed in the PARK position, the BCM will then energize the park lamp relay coil control circuit. Current flow is now from the park lamp relay to the park/tail lamps. The front park lamps are grounded at G100 and G101. The rear park lamps are grounded at G401 and G402. The license plate lamps are a part of the rear park lamp circuit and are grounded at G401. The inadvertent power control feature prevents the park lights from remaining on more than 10 minutes if left on. If the park lights are turned on after the ignition switch has been turned OFF, or is in the ACCY position, they will remain on until turned off or the battery runs dead.

Remote Keyless Entry Exterior Lamp Illumination

When the remote function actuation (RFA) module receives a door unlock command from the remote function actuator transmitter, the RFA module will ground the door unlock signal circuit to the BCM, [send a class 2 message to the body control module (BCM), indicating that an UNLOCK command has been received. The BCM will then flash the park lamps twice. With all the doors closed, and the RKE transmitter is used to lock the doors, the park lamps will flash twice. The park lamps will not flash if the rear compartment is opened using the RKE transmitter.

Turn Signal Lamps

Ignition positive voltage from the TRN SIG fuse in the console fuse block is supplied to the turn signal switch. when the turn signal lever is placed in the turn left or turn right position, voltage is applied to the turn signal lamp flasher assembly in the console fuse block. The turn signal lamps may only be activated with the ignition switch in the ON or ACCY position. When the turn signal switch is placed in either the left or right position, current flow is from the flasher module's output to the turn signal switch assembly. The flasher module then sends an on-off voltage signal to either the left or right turn signals and their instrument cluster (IPC) indicator. For the hazard lamps voltage is applied from the HZDL fuse in the console fuse block to the hazard flasher. When the hazard switch is pressed, all the turn signal lamps will flash including both IPC turn signal indicators. The hazard and turn signal lamp flasher assembly is grounded at G200. The front turn signals are grounded at G100 and G101 and the rear turn signals are grounded at G401 and G402.

Turn Signal Reminder

The radio activates the turn signal warning as requested by the IPC. The IPC sends a class 2 message to the radio indicating the chime frequency (medium rate) and duration (continuous). The turn signal warning sounds when the following occurs

1. The ignition switch is in the RUN position.
2. The turn signal switch is in either turn position, sensing, within 1 second, an open to B+ transition in the turn signal control circuit (left or right turn).
3. The vehicle has traveled a distance of 1.2 km (3/4 mi) by counting pulses on the vehicle speed input circuit.

The IPC turns off the turn signal reminder when either the ignition switch is turned to the OFF position, or the turn signal switch returns to the OFF position, sensing, within 1 second, no transitions from open to B+ in either of the turn signal control circuits (left turn or right turn).

Stop Lamps

The HZDL fuse in the console fuse block supplies battery positive voltage to the normally open stoplamp switch. When the driver presses the brake pedal, the switch contacts close and battery positive voltage is supplied to both left and right stop lamp assemblies and to the center high mounted stop lamp (CHMSL). The CHMSL is grounded at G301. The left stop lamp is grounded at G401 and the right stop lamp is grounded at G402.

Backup Lamps

The TURN SIG fuse in the console fuse block supplies battery positive voltage to park neutral position switch. When the gear selector lever is in the REVERSE position, power is supplied to both of the backup lamps. The backup lamps are grounded at G401 and G402.

Battery Rundown Protection / Inadvertent Power

The body control module (BCM) controls the lighting system through circuits that enable both the exterior lamp functions of the park lamps, the headlamps, and the fog lamps, as well as the interior lamps. The BCM opens these enabling circuits 20 minutes 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 20-minute period, the timer resets for another 20 minutes.

High Beam

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

Park Lamp Out

The IPC illuminates the park lamp out indicator in the message center when the BCM determines a park lamp out condition exists. The IPC receives a class 2 message from the BCM requesting illumination.

The IPC sends a class 2 message to the radio in order to activate an audible warning.

Turn Signals

The IPC illuminates the right or left turn signal indicator when the IPC detects a turn signal request or a hazard request. If the IPC determines that the turn signal is active for more than 1.21 km (0.75 mi), the IPC sends a class 2 message to the radio in order to activate the audible warning.

Interior Lamps

The interior lighting consist of two groups. This first group includes lamps that may not be dimmed.

1. The courtesy/reading lamps
2. The cargo lamp
3. The vanity mirror lamps
4. The IP compartment lamps
5. The instrument panel (IP) courtesy lamps

Courtesy Lamps

The courtesy lamps, include the roof rail/reading lamps, the footwell lamps, dome and rear view mirror lamps. The courtesy lamps, may be manually turned on by placing the interior lamp switch in the DOME position, or by opening a door. After all the doors have been closed the courtesy lamps will remain illuminated approximately 15 seconds after the last door closes. The courtesy lamps will also turn on prior to any door being opened, and remain illuminated approximately 30 seconds when the driver removes the ignition key.

The BCM L fuse in the console fuse block, supplies battery positive voltage to the body control module (BCM). The courtesy lamps supply voltage circuit of the BCM supplies battery positive voltage to all interior courtesy lamps. When any door is opened the door open switch contacts close and a door open input is received by the BCM. If a door lock or unlock input is received by the BCM, it will activate the inadvertent power relay inside of the BCM, providing battery positive voltage to all interior courtesy lamps. Some of the courtesy lamps may also be used as reading lamps by placing the lamps switch in the ON or OFF position.

The courtesy lamps will normally turn off using the theater dimming feature. The BCM provides a pulse width modulated ground to all courtesy/reading, dome and inside rear view mirror lamps for the theater dimming feature. The BCM will immediately turn off the courtesy lamps if a door lock command is received with all the doors closed, or if the ignition switch is turned to either the ON or RUN position.

The courtesy lamps will also turn on after an air bag deployment for approximately 15 seconds.

Keyless Entry Interior Illumination

When the driver uses the door key in order to unlock the doors, the body control module (BCM) receives a door unlock signal. The BCM must have inputs that indicate that the ignition switch is OFF, the courtesy lamp switch is OFF and all the doors are closed. The BCM will then activate the interior lamps. The courtesy lamps will remain on, approximately 15 seconds after the door is closed. The BCM will then turn them off through the theater dimming feature. If the door locks are activated to the LOCK position, or if the ignition switch is turned to either the RUN or CRANK position the courtesy lamps will turn off immediately.

When the driver uses the remote function actuator transmitter to unlock the doors, trunk or presses the panic button, the BCM will keep the courtesy lamps on approximately 30 seconds. If the door locks are activated to the UNLOCK or LOCK position, or if the ignition switch is turned to either the RUN or CRANK position the courtesy lamps will turn off immediately. The BCM will also keep the courtesy lamps on approximately 40 seconds, after an alarm event is completed.

Vanity Lamps

The courtesy lamps supply voltage circuit also provides battery positive voltage to each vanity mirror lamp. When the vanity mirror cover on the sunshade is opened, its switch closes to provide a ground circuit and the vanity lamp illuminates.

IP Compartment Lamp

The courtesy lamps supply voltage circuit also provides battery positive voltage to the instrument panel compartment lamp. When the IP compartment is opened, its switch closes to provide a ground circuit and the IP compartment lamp illuminates.

Cargo Lamp

The courtesy lamps supply voltage circuit also provides battery positive voltage to the cargo lamp. When the rear compartment is opened, its switch closes to provide a ground circuit and the cargo lamp illuminates.

Interior Lamps Dimming

The second group includes lamps which may be dimmed. This group may use a combination of vacuum fluorescent (VF) illumination and of incandescent lamps.

1. The door switches and the window switches
2. The HVAC control head assembly
3. The radio
4. The instrument panel cluster (IPC)
5. The steering wheel controls
6. The heated seat switch
7. The HUD switch
8. The lift glass window release switch and traction control switch

When the ignition switch is turned to the ON position, the vacuum fluorescent (VF) displays (radio and HVAC control assembly), incandescent lamps, turn on at maximum brightness. When the park lamps are on and the ambient light sensor indicates low light conditions, all incandescent back lighting turn on at the dimming level indicated by the IP dimmer switch. At the same time all vacuum fluorescent (VF) displays dim to match the indicated dimming level. The BCM L fuse in the console fuse block, supplies battery positive voltage to the BCM. The I/P courtesy lamps supply voltage circuit of the BCM, supplies battery positive voltage to all the dimmable lamps. When the headlamp switch is placed in the PARK position, the BCM will then dim the interior lamps to the dimming level indicated by the IP dimmer switch. When the driver selects a dimming setting by moving, the IP dimming switch potentiometer, all incandescent back lighting lamps are provided with a specific voltage. The incandescent back lighting lamps are then grounded at G200, G301 and G302. When the IP dimmer switch is moved from MIN to MAX, all vacuum fluorescent (VF) displays, as well as all incandescent back lighting respond from Minimum intensity to maximum brightness in response to the IP dimmer switch.

The driver may select parade mode by manually turning on the park lamps during daylight conditions. The front park lamp circuit supplies voltage to the instrument panel cluster, radio and HVAC assembly for a park lamp on input, and the displays will become full bright.

The body control module (BCM) controls the lighting system through circuits that enable both the exterior lamp functions of the park lamps, the headlamps, and the fog lamps, as well as the interior lamps. The BCM opens these enabling circuits 20 minutes 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 20-minute period, the timer resets for another 20 minutes.

See also:
• Scan Tool Does Not Power Up
• Power Mode Mismatch
• Diagnostic Trouble Code (DTC) List
• Diagnostic Trouble Code (DTC) List
• Master Electrical Component List
• Testing for Intermittent Conditions and Poor Connections
• Circuit Testing
• Wiring Repairs
• Connector Repairs
• Relay Replacement (Attached to Wire Harness)
• Cruise Control Schematics
• Engine Control Module (ECM) Replacement
• Checking Aftermarket Accessories
• Lock Replacement - Rear Door
• Latch Replacement - Liftgate (Aztek)
• Multifunction, Turn Signal Switch Replacement
• Instrument Panel Cluster (IPC) Replacement
• Steering Wheel Control Switch Assembly Replacement
• Lifting and Jacking the Vehicle
• Fastener Notice
• Diagnostic System Check - Lighting Systems
• Diagnostic Trouble Code (DTC) List
• Stop Lamp Switch Adjustment
• Backup Lamps Always On
• Backup Lamps Inoperative
• Courtesy Lamps Inoperative
• Courtesy Lamps Always On
• Daytime Running Lamps (DRL) Inoperative
• Fog Lamps Always On
• Fog Lamps Inoperative
• Hazard Lamps Inoperative
• Hazard Lamps Always On
• Headlamps Always On - Low or High Beam
• Headlamps Inoperative - Low Beams
• Headlamps Inoperative - High Beams
• Headlamps Inoperative - Low and High Beams
• High Beam Indicator Inoperative
• Interior Backlighting Inoperative
• Illuminated Entry Lamps Inoperative
• Interior Lamps Off Switch Inoperative
• Park Lamp Out Indicator Inoperative
• Park Lamps Always On
• Park Lamps Inoperative
• Park Lamps Inoperative - Output at Trailer/Upfitter Connector
• Reading Lamp(s) Inoperative
• Stop Lamps Always On
• Stop Lamps Inoperative
• Turn Signal Lamps and/or Indicators Inoperative
• Turn Signal Lamps Inoperative - Output at Trailer/Upfitter Connector
• Fog Lamp Aiming Procedure