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Contents Wiring diagrams Section: Exterior Lights All sections

Lighting Systems Chevrolet Corvette C6

Exterior Lights 33 illustrations ~24353 words

Fastener Tightening Specifications

ApplicationSpecification
MetricEnglish
Back Up Lamp Screw (Z06)2 N.m18 lb in
Brake Pedal Position Sensor Screw2 N.m18 lb in
Fender Flange Bolt10 N.m89 lb in
Front Fog Lamp Mounting Screws1.5 N.m13 lb in
Headlamp Ballast Screws3 N.m27 lb in
Headlamp Control Module Screws6 N.m53 lb in
Headlamp Mounting Nuts6.5 N.m58 lb in
High-Mounted Stoplamp Retaining Nuts (Base, Z06)6 N.m53 lb in
License Lamp Assembly Retaining Screws2 N.m18 lb in
Rear Spoiler Nuts (Base, Z06)10 N.m89 lb in
Rear Spoiler Nuts (ZR1)4 N.m35 lb in
Tail/Backup Lamp Retaining Screws (Z06)2 N.m18 lb in
Tail/Turn Signal Lamp Retaining Screws2 N.m18 lb in

Scheme 1

Scheme 1: Headlights/Daytime Running Lights (DRL) Schematics
Scheme 1: Headlights/Daytime Running Lights (DRL) Schematics

Scheme 2

Scheme 2
Scheme 2

Scheme 3

Scheme 3: Fog Lights Schematics
Scheme 3: Fog Lights Schematics

Scheme 4

Scheme 4
Scheme 4

Scheme 5

Scheme 5: Exterior Lights Schematics
Scheme 5: Exterior Lights Schematics

Scheme 6

Scheme 6
Scheme 6

Scheme 7

Scheme 7
Scheme 7

Scheme 8

Scheme 8
Scheme 8

Scheme 9

Scheme 9
Scheme 9

Scheme 10

Scheme 10
Scheme 10

Scheme 11

Scheme 11: Interior Lights Schematics
Scheme 11: Interior Lights Schematics

Scheme 12

Scheme 12
Scheme 12

Scheme 13

Scheme 13: Interior Lights Dimming Schematics
Scheme 13: Interior Lights Dimming Schematics

Scheme 14

Scheme 14
Scheme 14

DIAGNOSTIC CODE INDEX

DTCDescription
DTC B1480B1480 00: Battery Rundown Protection Circuit
DTC B2530B2530 02: Front Fog Lamps Control Circuit Short to Ground B2530 05: Front Fog Lamps Control Circuit Open or Short to Voltage
DTC B2540B2540 02: Rear Fog Lamps Control Circuit Short to Ground B2540 05: Rear Fog Lamps Control Circuit Open or Short to Voltage
DTC B2580B2580 01: Headlamp High Beam Control Circuit Short to Voltage B2580 06: Headlamp High Beam Control Circuit Open or Short to Ground
DTC B2585B2585 01: Park Lamp Control Circuit Short to Voltage B2585 06: Park Lamp Control Circuit Open or Short to Ground
DTC B2646B2646: Ambient Light Sensor Circuit Performance
DTC B3948 or B3949B3948 02: Left Front Turn Signal Circuit Short to Ground B3948 05: Left Front Turn Signal Circuit Open or Short to Voltage B3949 02: Right Front Turn Signal Circuit Short to Ground B3949 05: Right Front Turn Signal Circuit Open or Short to Voltage
DTC B3950 or B3951B3950 02: Left Rear Turn Signal Circuit Short to Ground B3950 05: Left Rear Turn Signal Circuit Open or Short to Voltage B3951 02: Right Rear Turn Signal Circuit Short to Ground B3951 05: Right Rear Turn Signal Circuit Open or Short to Voltage
DTC C0277C0277 06: Brake Pedal Position Sensor Circuit Short to Ground or Open C0277 07: Brake Pedal Position Sensor Circuit Voltage Above Threshold C0277 09: Brake Pedal Position Sensor Circuit Rate of Change Above Threshold
DTC C0278C0278 00: Brake Pedal Position Sensor Not Calibrated
DTC C0870C0870 03: Device Voltage Reference Output 1 Circuit Voltage Below Threshold C0870 07: Device Voltage Reference Output 1 Circuit Voltage Above Threshold
DTC P0719P0719: Brake Switch Circuit Low Voltage
DTC P0724P0724: Brake Switch Circuit High Voltage

DIAGNOSTIC CODE INDEX

Diagnostic Starting Point - Lighting

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

  1. The identification of the control modules which command the system
  2. The ability of the control modules 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 - Vehicle will identify the correct procedure for diagnosing the system and where the procedure is located.

Diagnostic Instructions

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Courtesy Lamp Low Control21, 21, 2
Courtesy Lamp ControlB1480 001, 2
Inside Rearview Mirror Ground1
1. Rearview Mirror Lamp(s) Inoperative - Inside 2. Courtesy Lamps Malfunction

Circuit/System Description

The CTSY/LAMP fuse supplies battery voltage to the body control module (BCM). The BCM applies battery voltage to the courtesy lamps through the courtesy lamp supply voltage circuit. When any door is opened, the jam switch contacts close and the BCM receives a door-open input. If the BCM receives a door lock or unlock input or a rear hatch open input, the BCM will activate the courtesy lamp supply voltage circuit, providing battery voltage to all of the instrument panel (I/P) courtesy lamps, rearview mirror lamps, and rear compartment lamps. The BCM also provides a class 2 serial data message to the driver door module (DDM) and passenger door module (PDM) to apply battery voltage to the exterior courtesy lamps. In the event that any of these lamps were to remain illuminated for more than 10 minutes with the ignition switch in the OFF position, the BCM will deactivate the courtesy lamp supply voltage circuit to prevent a total battery discharge condition.

Conditions for Running the DTC

Battery voltage must be between 9-16 volts.

Conditions for Setting the DTC

DTC B1480 will set when the courtesy lamp supply voltage circuit that feeds the courtesy lamps, underhood lamp, IP compartment lamp, console lamp and both visor vanity mirror lamps is shorted to ground for longer than 1 second.

Actions Taken When the DTC Sets

The courtesy lamps, underhood lamp, I/P compartment lamp, and both visor vanity mirror lamps will not operate.

Conditions for Clearing the DTC

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

Reference Information

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

  1. Ignition OFF, disconnect the appropriate harness connector at each component fed by the courtesy lamp supply voltage circuit.
  2. Ignition ON, verify that a test lamp illuminates between the courtesy lamp supply voltage circuit at each component harness connector and ground. If the test lamp does not illuminate, test the courtesy lamp supply voltage circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the BCM.
  3. Connect each component one at a time and verify with a scan tool if the DTC resets as current.
  4. If the DTC resets, test or replace the inoperative component.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Instrument Panel Courtesy Lamp Bulb Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems)
  2. «Instrument Panel Compartment Lamp Switch Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems)
  3. «Cargo Lamp Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems)
  4. «Inside Rearview Mirror Replacement (DD8)»(/chevrolet/corvette/c6-2004-2014/remont/mirrors/#mirror-system) or «Inside Rearview Mirror Replacement (Except DD8)»(/chevrolet/corvette/c6-2004-2014/remont/mirrors/#mirror-system)
  5. «Sunshade Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exteriorinterior-trim/#interior-trim-and-paneling)
  6. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Front Fog Lamp Relay ControlB2530 02B2530 05B2530 05
Front Fog Lamp Voltage Supply111
Front Fog Lamp Switch Signal11
Front Fog Lamp Relay Ground11
Fog Lamp - LF Ground11
Fog Lamp - RF Ground11
Fog Lamp Switch Ground11
1. Front Fog Lamps Malfunction

The front fog lamp switch signal circuit is grounded momentarily by pressing the front fog lamp switch. The body control module (BCM) energizes the front fog lamp relay by applying battery voltage to the front fog lamp relay control circuit. When the front fog lamp relay is energized, battery voltage is applied via the FOG LAMP fuse to the front fog lamp supply voltage circuit which illuminates the front fog lamps.

Battery voltage must be between 9-16 volts.

B2530 02

This DTC will set when the BCM detects a short to ground in the front fog lamp relay control circuit.

B2530 05

This DTC will set when the BCM detects an open or short to voltage in the front fog lamp relay control circuit.

  1. When DTC B2530 02 is present, the front fog lamps will not operate when the park lamps are ON and the front fog lamp switch is active.
  2. When DTC B2530 05 is present, the front fog lamps and/or the front fog lamp indicator will be ON at all times or will not operate.
  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, disconnect the front fog lamp relay.
  2. Ignition OFF, scan tool OFF, exterior lamps OFF, test for less than 5.0 ohms between the ground circuit terminal C3 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the control circuit terminal A4 and ground.
  4. Command the front fog lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM. If the test lamp is always OFF, test the control circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the front fog lamp relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Relay Replacement (Attached to Wire Harness)»(/chevrolet/corvette/c6-2004-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction) or «Relay Replacement (Within an Electrical Center)»(/chevrolet/corvette/c6-2004-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction)
  2. «Underhood Electrical Center or Junction Block Replacement»(/chevrolet/corvette/c6-2004-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction)
  3. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Rear Fog Lamp Relay ControlB2540 02B2540 05B2540 05
Rear Fog Lamp Voltage Supply111
Rear Fog Lamp Switch Signal11
Rear Fog Lamp Relay Voltage Supply11
Fog Lamp - LR Ground11
Fog Lamp - RR Ground11
Fog Lamp Switch Ground11
1. Rear Fog Lamps Malfunction

The rear fog lamp switch signal circuit is grounded momentarily by pressing the rear fog lamp switch. The body control module (BCM) energizes the rear fog lamp relay by applying ground to the rear fog lamp relay control circuit. When the rear fog lamp relay is energized, battery voltage is applied via the REAR FOG/ALDL TOP SW fuse to the rear fog lamp supply voltage circuit which illuminates the rear fog lamps.

Battery voltage must be between 9-16 volts.

B2540 02

This DTC will set when the BCM detects a short to ground in the rear fog lamp relay control circuit.

B2540 05

This DTC will set when the BCM detects an open or short to voltage in the rear fog lamp relay control circuit.

  1. When DTC B2540 02 is present, the rear fog lamps will not operate when the park lamps are ON and the rear fog lamp switch is active.
  2. When DTC B2540 05 is present, the rear fog lamps and/or the rear fog lamp indicator will be ON at all times or will not operate.
  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, disconnect the rear fog lamp relay.
  2. Connect a test lamp between the control circuit terminal A6 and the B+ circuit terminal B4.
  3. Command the rear fog lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM. If the test lamp is always OFF, test the control circuit for a short to voltage or open/high resistance. If the circuit tests normal, replace the BCM.
  4. If all circuits test normal, test or replace the rear fog lamp relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Relay Replacement (Attached to Wire Harness)»(/chevrolet/corvette/c6-2004-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction) or «Relay Replacement (Within an Electrical Center)»(/chevrolet/corvette/c6-2004-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction)
  2. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Flash to Pass Switch Signal111
Headlamp Switch High Beam Signal111
Headlamp Switch Headlamps On Signal111
Headlamp Switch Headlamps Off Signal111
Headlamp High Beam Relay ControlB2580 06B2580 06B2580 01
Headlamp Low Beam Relay Control111
LF High Beam Headlamp Control111
LF Low Beam Headlamp Control111
RF High Beam Headlamp Control111
RF Low Beam Headlamp Control111
LF Headlamp Ground11
RF Headlamp Ground11
Turn Signal/Multifunction Switch Ground11
1. Headlamps Malfunction

When the turn signal/multifunction switch is placed in the headlamps high or flash to pass (FTP) position, ground is applied to the body control module (BCM) through the headlamp high beam signal circuit or the flash to pass switch signal circuit. The BCM then applies ground to the headlamp high beam relay control circuit which energizes the high beam relay, applying battery voltage to the high beam headlamps.

Battery voltage must be between 9-16 volts.

B2580 01

This DTC will set when the BCM detects a short to battery voltage in the headlamp high beam relay control circuit.

B2580 06

This DTC will set when the BCM detects an open or short to ground in the headlamp high beam relay control circuit.

  1. When DTC B2580 01 is present, the high beam headlamps will not operate.
  2. When DTC B2580 06 is present, the high beam headlamps will remain ON.
  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, disconnect the high beam relay.
  2. Connect a test lamp between the control circuit terminal H1 and the B+ circuit terminal F2.
  3. Command the high beam headlamps ON and OFF with the high beam switch. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM. If the test lamp is always OFF, test the control circuit for a short to voltage or open/high resistance. If the circuit tests normal, replace the BCM.
  4. If all circuits test normal, test or replace the high beam relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Underhood Electrical Center or Junction Block Replacement»(/chevrolet/corvette/c6-2004-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction)
  2. «Relay Replacement (Attached to Wire Harness)»(/chevrolet/corvette/c6-2004-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction) or «Relay Replacement (Within an Electrical Center)»(/chevrolet/corvette/c6-2004-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction)
  3. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Park Lamp Switch ON Signal111
Park Lamp Relay ControlB2585 06B2585 06B2585 01
License Lamp Control111
Park Lamp Control111
License Lamp Ground11
Park Lamps - LF Ground11
Park Lamps - RF Ground11
Tail/Stop and Turn Signal Lamps - LR Ground11
Tail/Stop and Turn Signal Lamps - RR Ground11
Turn Signal/Multifunction Switch Ground11
1. Park, License, and/or Tail Lamps Malfunction

Battery positive voltage is applied at all times from the PARK LAMPS fuse to both the coil and switched sides of the PARK LAMP Relay in the underhood electrical center. Ground is applied from G201 to the multifunction switch at all times. When the headlamp switch is placed in either the HEAD or PARK position, ground is applied to the park lamp relay control circuit. This energizes the PARK LAMP Relay and applies battery positive voltage to all of the park, tail, license, and marker lamps.

Battery voltage must be between 9-16 volts.

B2585 01

This DTC will set when the BCM detects a short to battery voltage in the park lamp relay control circuit.

B2585 06

This DTC will set when the BCM detects an open or short to ground in the park lamp relay control circuit.

  1. When DTC B2585 01 is present, the park lamps will not operate.
  2. When DTC B2585 06 is present, the park lamps will remain ON.
  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, disconnect the park lamp relay.
  2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal C9 and ground. If the test lamp illuminates, test the control circuit for a short to voltage.
  3. Verify that a test lamp illuminates between the B+ circuit terminal A9 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the control circuit terminal C9 for a short to ground. If the circuit tests normal, test or replace the park lamp relay.
  4. Verify that a test lamp illuminates between the B+ circuit terminal A8 and ground. If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
  5. Connect a test lamp between the B+ circuit terminal A9 and the control circuit terminal C8.
  6. Command the parks lamps ON and OFF with the park lamp switch. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM. If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  7. If all circuits test normal, test or replace the park lamp relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Relay Replacement (Attached to Wire Harness)»(/chevrolet/corvette/c6-2004-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction) or «Relay Replacement (Within an Electrical Center)»(/chevrolet/corvette/c6-2004-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction)
  2. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Ambient Light Sensor SignalB2646B2646B2646
Driver Sun Load Sensor SignalB0184B0184B0184
Passenger Sun Load Sensor SignalB0189B0189B0189
Left Front Turn Signal Lamp ControlB3948 02B3948 05B3948 05
Right Front Turn Signal Lamp ControlB3949 02B3949 05B3949 05
Sunload Sensor Assembly Low ReferenceB0184 or B0189B0184 or B0189
Turn Signal Lamp - LF Ground11
Turn Signal Lamp - RF Ground11
1. Turn Signal Lamps and/or Indicators Malfunction

The ambient light sensor is used to monitor outside lighting conditions. The ambient light sensor provides a voltage signal that will vary between 0.09 and 4.9 volts depending on outside lighting conditions. The HVAC control module provides a low reference ground and a 5-volt reference signal to the ambient light sensor. The HVAC control module monitors the ambient light sensor signal circuit to determine if outside lighting conditions are correct for either daytime running lights (DRL) or automatic lamp control (ALC) when the headlamp switch is in the AUTO position. The HVAC control module sends a signal to the body control module (BCM) via serial data commanding the BCM to turn the front turn signal lamps on steady (non-flashing). Any function or condition that turns on the headlamps will cancel the DRL operation. With the turn signal/multifunction switch in the OFF position, the turn signal lamps will either be turned ON or OFF after a 30 second delay, depending on whether daylight or low light conditions are sensed by the ambient light sensor.

Battery voltage must be between 9-16 volts.

The HVAC control module detects the ambient light sensor signal circuit is less than 5 counts (0.09 volt) or greater than 250 counts (4.75 volts) for 3 consecutive tests.

The HVAC control module defaults to low light status.

  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 50 consecutive malfunction-free ignition cycles have occurred.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, disconnect the harness connector at the sunload sensor assembly.
  2. Ignition OFF, scan tool OFF, doors CLOSED test for less than 20 ohms between the low reference circuit terminal C and ground. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the HVAC control module.
  3. Ignition ON, verify the scan tool Ambient Light Sensor parameter is greater than 250 counts. If less than the specified range, test the signal circuit terminal D for a short to ground. If the circuit tests normal, replace the HVAC control module.
  4. Install a 3A fused jumper wire between the signal circuit terminal D and the low reference circuit terminal C. Verify the scan tool Ambient Light Sensor parameter is less than 5 counts. If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the HVAC control module.
  5. If all circuits test normal, replace the sun load sensor assembly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Sun Load Temperature Sensor Replacement»(/chevrolet/corvette/c6-2004-2014/remont/automatic-hvac-system/#hvac-system-automatic)
  2. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for HVAC control module replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Hazard Switch Signal222
Left Front Turn Signal Lamp Supply VoltageB3948 02B3948 05B3948 05
Right Front Turn Signal Lamp Supply VoltageB3949 02B3949 05B3949 05
Left Rear Turn Lamp Supply VoltageB3950 02B3950 05B3950 05
Right Rear Turn Lamp Supply VoltageB3951 02B3951 05B3951 05
Left Turn Signal Switch Signal11
Right Turn Signal Switch Signal11
Hazard Switch Ground22
Left Rear Stop/Turn Lamp Ground11
Repeater Lamp-Left Ground11
Repeater Lamp-Right Ground11
Right Rear Stop/Turn Lamp Ground11
Turn Signal/Multifunction Switch Ground11
Turn Signal Lamp - LF Ground11
Turn Signal Lamp - RF Ground11
Turn Signal Lamps and/or Indicators Malfunction. Hazard Lamps Malfunction

Ground is applied at all times at G201 to the turn signal/multifunction switch. The turn signal lamps may only be activated with the ignition switch in the ON or START position. When the turn signal/multifunction switch is placed in either the TURN RIGHT or TURN LEFT position, ground is applied to the body control module (BCM) through either the right turn or left turn signal switch signal circuit. The BCM then applies a pulsating voltage to the front and rear turn signal lamps through their respective voltage supply circuits. Ground for the left front turn signal lamp is supplied at G101. Ground for the right front turn signal lamp is supplied at G102.

Battery voltage must be between 9-16 volts.

B3948 02

This DTC will set when the BCM detects a short to ground in the LF turn signal voltage supply circuit.

B3948 05

This DTC will set when the BCM detects an open or short to voltage in the LF turn signal voltage supply circuit.

B3949 02

This DTC will set when the BCM detects a short to ground in the RF turn signal voltage supply circuit.

B3949 05

This DTC will set when the BCM detects an open or short to voltage in the RF turn signal voltage supply circuit.

When this DTC is present, the LF turn signal lamp will not operate.

When this DTC is present, the LF turn signal lamp will be ON at all times for a short to voltage condition. For an open condition, the LF turn signal lamp will be inoperative.

When this DTC is present, the RF turn signal lamp will not operate.

When this DTC is present, the RF turn signal lamp will be ON at all times for a short to voltage condition. For an open condition, the RF turn signal lamp will be inoperative.

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

Diagnostic Aids

  1. Check the LF turn signal bulb. If the bulb is open, DTC B3948 05 will set as current only.
  2. Check the RF turn signal bulb. If the bulb is open, DTC B3949 05 will set as current only.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

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

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for BCM replacement, setup, and programming

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Hazard Switch Signal222
Left Front Turn Signal Lamp Supply VoltageB3948 02B3948 05B3948 05
Right Front Turn Signal Lamp Supply VoltageB3949 02B3949 05B3949 05
Left Rear Turn Lamp Supply VoltageB3950 02B3950 05B3950 05
Right Rear Turn Lamp Supply VoltageB3951 02B3951 05B3951 05
Left Turn Signal Switch Signal11
Right Turn Signal Switch Signal11
Hazard Switch Ground22
Left Rear Stop/Turn Lamp Ground11
Repeater Lamp-Left Ground11
Repeater Lamp-Right Ground11
Right Rear Stop/Turn Lamp Ground11
Turn Signal/Multifunction Switch Ground11
Turn Signal Lamp - LF Ground11
Turn Signal Lamp - RF Ground11
Turn Signal Lamps and/or Indicators Malfunction. Hazard Lamps Malfunction

Ground is applied at all times at G201 to the turn signal/multifunction switch. The turn signal lamps may only be activated with the ignition switch in the ON or START position. When the turn signal/multifunction switch is placed in either the TURN RIGHT or TURN LEFT position, ground is applied to the body control module (BCM) through either the right turn or left turn signal switch signal circuit. The BCM then applies a pulsating voltage to the front and rear turn signal lamps through their respective voltage supply circuits. Ground for the left rear turn signal lamp is supplied at G301. Ground for the right rear turn signal lamp is supplied at G302.

Battery voltage must be between 9-16 volts.

B3950 02

This DTC will set when the BCM detects a short to ground in the LR turn signal voltage supply circuit.

B3950 05

This DTC will set when the BCM detects an open or short to voltage in the LR turn signal voltage supply circuit.

B3951 02

This DTC will set when the BCM detects a short to ground in the RR turn signal voltage supply circuit.

B3951 05

This DTC will set when the BCM detects an open or short to voltage in the RR turn signal voltage supply circuit.

When this DTC is present, the LR turn signal lamp will not operate.

When this DTC is present, the LR turn signal lamp will be ON at all times for a short to voltage condition. For an open condition, the LR turn signal lamp will be inoperative.

When this DTC is present, the RR turn signal lamp will not operate.

When this DTC is present, the RR turn signal lamp will be ON at all times for a short to voltage condition. For an open condition, the RR turn signal lamp will be inoperative.

  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.
  1. Check the LR turn signal bulb. If the bulb is open, DTC B3950 05 will set as current only.
  2. Check the RR turn signal bulb. If the bulb is open, DTC B3951 05 will set as current only.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

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

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Tail Lamp Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems)
  2. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Brake Position Sensor SignalC0277 06C0277 06C0277 07C0277 09
Stop Lamp Relay Control111
Stop Lamp Switch SignalP0572, P0719P0573, P0719P0573, P0724
Stop Lamp Relay Switch B+11
Brake Position Sensor 5-Volt ReferenceC0870 03C0870 03C0870 07
Brake Position Sensor Low ReferenceC0277 06C0277 07
Left Rear Stop/Turn Lamp Supply Voltage111
Right Rear Stop/Turn Lamp Supply Voltage111
Center High Mounted Stop Lamp (CHMSL) Ground11
Rear Stop/Turn Lamp Ground11
1. Stop Lamps Malfunction

The brake pedal position sensor is used to sense the action of the driver application of the brake pedal. The brake pedal position sensor provides an analog voltage signal that will increase as the brake pedal is applied. The body control module (BCM) provides a low reference signal and a 5-volt reference voltage to the brake pedal position sensor. When the variable signal reaches a voltage threshold indicating the brakes have been applied, the BCM will apply battery positive voltage to the stop lamps, transmission control module (TCM), engine control module (ECM), and stop lamp relay coil side. The BCM also supplies the stop lamp relay coil with ground. When the stop lamp relay receives battery voltage and ground from the BCM, the relay coil is energized and the stop lamp relay switch contacts close applying battery voltage through the STOP/B/U/LPS fuse to illuminate the center high mounted stop lamp (CHMSL).

Battery voltage must be between 9-16 volts.

C0277 06

This DTC will set when the BCM detects an open or short to ground in the brake pedal position sensor signal circuit for 0.5 seconds or greater.

C0277 07

This DTC will set when the BCM detects a short to battery voltage in the brake pedal position sensor signal or low reference circuits for 0.5 seconds or greater.

C0277 09

This DTC will set when the BCM detects the brake pedal position sensor signal is changing faster than possible under normal operating conditions.

  1. The Service Vehicle Soon indicator is commanded ON.
  2. When DTC C0277 is set as current, the vehicle will not start.
  3. If the DTC sets while the vehicle is running, the BCM will activate the brake lights when the vehicles transmission is not in the PARK position and the vehicle is not accelerating.
  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 50 malfunction-free ignition cycles have occurred.
  3. A DTC will not clear the current status until the next ignition cycle.
IMPORTANTThe stop lamps will not illuminate unless the ignition is in the ON position. For more detailed information concerning stop lamp operation, refer to Exterior Lighting Systems Description and Operation .

If DTC C0277 09 is set, replace the brake pedal position sensor. If the DTC resets, replace the BCM.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, disconnect the harness connector at the brake pedal position sensor.
  2. Ignition OFF, verify that a test lamp illuminates between B+ and the low reference circuit terminal A. If the test lamp does not illuminate, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the BCM.
  3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal C and ground. If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM. If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the BCM.
  4. Verify the scan tool BPP sensor signal parameter is less than 0.2 volts. If greater than the specified range, test the signal circuit terminal B for a short to voltage. If the circuit tests normal, replace the BCM.
  5. Install a 3A fused jumper wire between the signal circuit terminal B and the 5-volt reference circuit terminal C. Verify the scan tool BPP sensor signal parameter is greater than 4.75 volts. If less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  6. If all circuits test normal, test or replace the brake pedal position sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Brake Pedal Position Sensor Calibration»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems__brake-pedal-position-sensor-calibration)
  2. «Brake Pedal Position Sensor Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems__brake-pedal-position-sensor-replacement)
  3. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Brake Position Sensor SignalC0277 06C0277 06C0277 07C0277 09
Stop Lamp Relay Control111
Stop Lamp Switch SignalP0572, P0719P0573, P0719P0573, P0724
Stop Lamp Relay Switch B+11
Brake Position Sensor 5-Volt ReferenceC0870 03C0870 03C0870 07
Brake Position Sensor Low ReferenceC0277 06C0277 07
Left Rear Stop/Turn Lamp Supply Voltage111
Right Rear Stop/Turn Lamp Supply Voltage111
Center High Mounted Stop Lamp (CHMSL) Ground11
Rear Stop/Turn Lamp Ground11
1. Stop Lamps Malfunction

The brake pedal position sensor is used to sense the action of the driver application of the brake pedal. The brake pedal position sensor provides an analog voltage signal that will increase as the brake pedal is applied. The body control module (BCM) provides a low reference signal and a 5-volt reference voltage to the brake pedal position sensor. When the variable signal reaches a voltage threshold indicating the brakes have been applied, the BCM will apply battery positive voltage to the stop lamps, transmission control module (TCM), engine control module (ECM), and stop lamp relay coil side. The BCM also supplies the stop lamp relay coil with ground. When the stop lamp relay receives battery voltage and ground from the BCM, the relay coil is energized and the stop lamp relay switch contacts close applying battery voltage through the STOP/B/U/LPS fuse to illuminate the center high mounted stop lamp (CHMSL).

Battery voltage must be between 9-16 volts.

DTC C0278 00 will set when the brake pedal position sensor home position is not learned.

  1. The Service Vehicle Soon indicator is commanded ON.
  2. When DTC C0278 is set as current, the vehicle will not start.
  3. Stop lamps may not activate at the expected brake pedal positions.
  1. A successful brake pedal position sensor calibration has been performed.
  2. The condition responsible for setting the DTC no longer exists.
  3. A history DTC will clear once 50 malfunction-free ignition cycles have occurred.
IMPORTANTThe stop lamps will not illuminate unless the ignition is in the ON position. For more detailed information concerning stop lamp operation, refer to Exterior Lighting Systems Description and Operation .

If DTC C0278 00 is set, recalibrate the brake pedal position sensor.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Verify that the DTC sets under the Conditions for Running and Setting.
  2. Perform the brake pedal position sensor recalibration procedure.
  3. Operate the vehicle within the conditions that the customer experienced and verify the DTC does not reset. If the DTC resets, replace the brake pedal position sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Brake Pedal Position Sensor Calibration»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems__brake-pedal-position-sensor-calibration)
  2. «Brake Pedal Position Sensor Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems__brake-pedal-position-sensor-replacement)
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Brake Position Sensor SignalC0277 06C0277 06C0277 07C0277 09
Stop Lamp Relay Control111
Stop Lamp Switch SignalP0572, P0719BP0573, P0719P0573, P0724
Stop Lamp Relay Switch B+11
Brake Position Sensor 5-Volt ReferenceC0870 03C0870 03C0870 07
Brake Position Sensor Low ReferenceC0277 06C0277 07
Left Rear Stop/Turn Lamp Supply Voltage111
Right Rear Stop/Turn Lamp Supply Voltage111
Center High Mounted Stop Lamp (CHMSL) Ground11
Rear Stop/Turn Lamp Ground11
1. Stop Lamps Malfunction

The brake pedal position sensor is used to sense the action of the driver application of the brake pedal. The brake pedal position sensor provides an analog voltage signal that will increase as the brake pedal is applied. The body control module (BCM) provides a low reference signal and a 5-volt reference voltage to the brake pedal position sensor. When the variable signal reaches a voltage threshold indicating the brakes have been applied, the BCM will apply battery positive voltage to the stop lamps, transmission control module (TCM), engine control module (ECM), and stop lamp relay coil side. The BCM also supplies the stop lamp relay coil with ground. When the stop lamp relay receives battery voltage and ground from the BCM, the relay coil is energized and the stop lamp relay switch contacts close applying battery voltage through the STOP/B/U/LPS fuse to illuminate the center high mounted stop lamp (CHMSL).

Battery voltage must be between 9-16 volts.

C0870 03

This DTC will set when the BCM detects a short to ground in the brake pedal position sensor voltage reference circuit for 0.5 seconds or greater.

C0870 07

This DTC will set when the BCM detects a short to battery voltage in the brake pedal position sensor voltage reference circuits for 0.5 seconds or greater.

  1. The Service Vehicle Soon indicator is commanded ON.
  2. If the DTC sets while the vehicle is running, the BCM will activate the brake lights when the vehicles transmission is not in the PARK position and the vehicle is not accelerating.
  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 50 malfunction-free ignition cycles have occurred.
  3. A DTC will not clear the current status until the next ignition cycle.
IMPORTANTThe stop lamps will not illuminate unless the ignition is in the ON position. For more detailed information concerning stop lamp operation, refer to Exterior Lighting Systems Description and Operation .

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

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

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Brake Pedal Position Sensor Calibration»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems__brake-pedal-position-sensor-calibration)
  2. «Brake Pedal Position Sensor Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems__brake-pedal-position-sensor-replacement)
  3. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Brake Position Sensor SignalC0277 06C0277 06C0277 07C0277 09
Stop Lamp Relay Control111
Stop Lamp Switch SignalP0572, P0719BP0573, P0719P0573, P0724
Stop Lamp Relay Switch B+11
Brake Position Sensor 5-Volt ReferenceC0870 03C0870 03C0870 07
Brake Position Sensor Low ReferenceC0277 06C0277 07
Left Rear Stop/Turn Lamp Supply Voltage111
Right Rear Stop/Turn Lamp Supply Voltage111
Center High Mounted Stop Lamp (CHMSL) Ground11
Rear Stop/Turn Lamp Ground11
1. Stop Lamps Malfunction

The brake pedal position sensor is used to sense the action of the driver application of the brake pedal. The brake pedal position sensor provides an analog voltage signal that will increase as the brake pedal is applied. The body control module (BCM) provides a low reference signal and a 5-volt reference voltage to the brake pedal position sensor. When the variable signal reaches a voltage threshold indicating the brakes have been applied, the BCM will apply battery positive voltage to the stop lamps, transmission control module (TCM), engine control module (ECM), and stop lamp relay coil side. The BCM also supplies the stop lamp relay coil with ground. When the stop lamp relay receives battery voltage and ground from the BCM, the relay coil is energized and the stop lamp relay switch contacts close applying battery voltage through the STOP/B/U/LPS fuse to illuminate the center high mounted stop lamp (CHMSL).

  1. DTCs P0722 or P0723 must not be set as current.
  2. DTC P0724 must not be set as current.
  3. With the brake switch high and vehicle speed less than 8 km/h (5 mph) then vehicle speed is greater than 8 km/h (5 mph), but less than 40 km/h (25 mph) for less than or equal to 6 seconds, then vehicle speed is greater than 40 km/h (25 mph) for 7 seconds.

The TCM detects an open or short to ground on the signal circuit when the serial data message from the BCM indicates the brakes are applied.

  1. The TCM does not request the ECM to illuminate the malfunction indicator lamp (MIL).
  2. The TCM records the operating conditions present when the Conditions for Setting the DTC are met. The TCM records this information as a failure record.
  3. Stores DTC P0719 in TCM memory.
  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 40 malfunction-free ignition cycles have occurred.
IMPORTANTThe stop lamps will not illuminate unless the ignition is in the ON position. For more detailed information concerning stop lamp operation, refer to Exterior Lighting Systems Description and Operation .

Verify that the brake pedal position sensor is properly calibrated.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, disconnect the X400 harness connector at the transmission.
  2. Connect a test lamp between the signal circuit terminal 6 and ground.
  3. Ignition ON, command the stop lamp relay control ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  4. If all circuits test normal, replace the TCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Brake Pedal Position Sensor Calibration»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems__brake-pedal-position-sensor-calibration)
  2. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM or TCM replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Brake Position Sensor SignalC0277 06C0277 06C0277 07C0277 09
Stop Lamp Relay Control111
Stop Lamp Switch SignalP0572, P0719BP0573, P0719P0573, P0724
Stop Lamp Relay Switch B+11
Brake Position Sensor 5-Volt ReferenceC0870 03C0870 03C0870 07
Brake Position Sensor Low ReferenceC0277 06C0277 07
Left Rear Stop/Turn Lamp Supply Voltage111
Right Rear Stop/Turn Lamp Supply Voltage111
Center High Mounted Stop Lamp (CHMSL) Ground11
Rear Stop/Turn Lamp Ground11
1. Stop Lamps Malfunction

The brake pedal position sensor is used to sense the action of the driver application of the brake pedal. The brake pedal position sensor provides an analog voltage signal that will increase as the brake pedal is applied. The body control module (BCM) provides a low reference signal and a 5-volt reference voltage to the brake pedal position sensor. When the variable signal reaches a voltage threshold indicating the brakes have been applied, the BCM will apply battery positive voltage to the stop lamps, transmission control module (TCM), engine control module (ECM), and stop lamp relay coil side. The BCM also supplies the stop lamp relay coil with ground. When the stop lamp relay receives battery voltage and ground from the BCM, the relay coil is energized and the stop lamp relay switch contacts close applying battery voltage through the STOP/B/U/LPS fuse to illuminate the center high mounted stop lamp (CHMSL).

  1. DTCs P0722 or P0723 must not be set as current.
  2. DTC P0719 must not be set as current.
  3. The vehicle speed is greater than 40 km/h (25 mph) for 7 seconds then vehicle speed is less than 40 km/h (25 mph), but greater than 8 km/h (5 mph) for less than 4.75 seconds.

The TCM detects a short to voltage on the signal circuit when the serial data message from the BCM indicates the brakes are not applied.

  1. The TCM does not request the ECM to illuminate the malfunction indicator lamp (MIL).
  2. The TCM records the operating conditions present when the Conditions for Setting the DTC are met. The TCM records this information as a failure record.
  3. Stores DTC P0724 in TCM memory.
  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 40 malfunction-free ignition cycles have occurred.
IMPORTANTThe stop lamps will not illuminate unless the ignition is in the ON position. For more detailed information concerning stop lamp operation, refer to Exterior Lighting Systems Description and Operation .
  1. Verify that the brake pedal position sensor is properly calibrated.
  2. Applying the brake pedal during vehicle acceleration may cause DTC P0724 to set.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, disconnect the X400 harness connector at the transmission.
  2. Connect a test lamp between the signal circuit terminal 6 and ground.
  3. Ignition ON, command the stop lamp relay control ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  4. If all circuits test normal, replace the TCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Brake Pedal Position Sensor Calibration»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems__brake-pedal-position-sensor-calibration)
  2. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM or TCM replacement, setup, and programming

Symptoms - Lighting

IMPORTANTThe following steps must be completed before using a symptom table.
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) before using a symptom table in order to verify that all of the following conditions are true: There are no DTCs set. The control modules can communicate via the serial data link.
  2. Review the system description and operation in order to familiarize yourself with the system functions. Refer to the following: «Exterior Lighting Systems Description and Operation»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems) «Interior Lighting Systems Description and Operation»(/chevrolet/corvette/c6-2004-2014/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»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__checking-aftermarket-accessories) .
  2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittent

Thoroughly inspect the wiring and connectors. An incomplete inspection of the wiring and connectors may result in misdiagnosis causing part replacement with the reappearance of the malfunction. If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections .

Symptom List

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

  1. «Backup Lamps Malfunction (Automatic Transmission)»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems) or «Backup Lamps Malfunction (Manual Transmission)»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems)
  2. «Courtesy Lamps Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems)
  3. «Daytime Running Lamps Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems)
  4. «Front Fog Lamps Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems__front-fog-lamps-malfunction)
  5. «Rear Fog Lamps Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems__rear-fog-lamps-malfunction)
  6. «Hazard Lamps Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems__hazard-lamps-malfunction)
  7. «Headlamps Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems)
  8. «Interior Backlighting Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems__interior-backlighting-malfunction)
  9. «Lights On Indicator Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems)
  10. «Park, License, and/or Tail Lamps Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems__park-license-andor-tail-lamps-malfunction)
  11. «Inside Rearview Mirror Lamp Inoperative»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems)
  12. «Stop Lamps Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems__stop-lamps-malfunction)
  13. «Turn Signal Lamps and/or Indicators Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems)
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Backup Lamp Relay B+11
Backup Lamp Relay Control111
Backup Lamp Control111
Backup Lamp - Left Ground11
Backup Lamp - Right Ground11
1. Backup Lamps Malfunction

The underhood fuse block supplies battery voltage through the STOP/B/U/LPS fuse to the coil and switch terminals of the BCK/UP LAMP Relay located in the body control module (BCM). When the transmission is placed in the REVERSE position, the transmission control module (TCM) sends a serial data message to the BCM. The message indicates that the gear selector is in the REVERSE position. The BCM grounds the back up lamp relay control circuit of the backup lamp relay. This energizes the backup lamp relay, closing the switch side contacts and provides battery voltage to the REVERSE LAMPS fuse through to the backup lamps. The backup lamps are permanently grounded at G302. With both power and ground the backup lamps illuminate. Once the driver moves the gear selector out of the REVERSE position, a message is sent by the TCM via serial data requesting the BCM to remove ground from the back up lamp relay control circuit. This opens the backup lamp relay switch contacts turning OFF the backup lamps.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

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

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Relay Replacement (Attached to Wire Harness)»(/chevrolet/corvette/c6-2004-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction) or «Relay Replacement (Within an Electrical Center)»(/chevrolet/corvette/c6-2004-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction)
  2. «Backup Lamp Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems)
  3. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Backup Lamp Relay B+11
Reverse Lamp Relay Control111
Backup Lamp Relay Control111
Backup Lamp Control111
Reverse Switch Control11
Backup Lamp - Left Ground11
Backup Lamp - Right Ground11
1. Backup Lamps Malfunction

The underhood fuse block supplies battery voltage through the STOP/B/U/LPS fuse to the coil and switch terminals of the BCK/UP LAMP Relay located in the body control module (BCM). The BCM provides the normally open reverse switch with voltage. When the transmission is placed in the reverse position, the reverse switch closes providing a ground path through the reverse lamp relay control circuit to the BCM. The BCM then grounds the back up lamp relay control circuit of the backup lamp relay. This energizes the backup lamp relay, closing the switch side contacts and provides battery voltage to the REVERSE LAMPS fuse through to the backup lamps. The backup lamps are permanently grounded at G302. Once the driver moves the gear selector out of the REVERSE position, the reverse switch opens and the BCM removes ground from the backup lamp relay control circuit. This opens the backup lamp relay switch contacts turning OFF the backup lamps.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, disconnect the backup lamp relay.
  2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 87 and ground. If the test lamp illuminates, test the control circuit for a short to voltage.
  3. Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the control circuit terminal 87 for a short to ground. If the circuit tests normal, test or replace the backup lamp relay.
  4. Verify that a test lamp illuminates between the B+ circuit terminal 85 and ground. If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
  5. Disconnect the harness connector at the inoperative backup lamp.
  6. Ignition OFF, exterior lamps OFF, test for less than 5 ohms between the ground circuit terminal 1 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  7. Connect the harness connector at the inoperative backup lamp.
  8. Connect a 10A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87. Verify the backup lamps are illuminate. If the backup lamps do not illuminate, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the inoperative backup lamp.
  9. Connect a test lamp between the B+ circuit terminal 85 and the control circuit terminal 86.
  10. Command the backup lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM. If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  11. Connect the backup lamp relay.
  12. Command the backup lamps ON and OFF with a scan tool. The backup lamps should turn ON and OFF when changing between the commanded states. If the backup lamps do not activate, replace the backup lamp relay.
  13. Ignition OFF, disconnect the harness connector at the reverse lamp switch.
  14. Ignition OFF, exterior lamps OFF, test for less than 5 ohms between the control circuit terminal 1 and ground. If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If circuits test normal, replace the BCM.
  15. Ignition OFF, disconnect the X2 harness connector at the BCM.
  16. Verify that a test lamp does not illuminate between B+ and the control circuit terminal 1 at the reverse lamp switch harness connector. If the test lamp illuminates, test the control circuit for a short to ground.
  17. Reconnect the X2 harness connector at the BCM.
  18. Ignition ON, verify that a test lamp illuminates between the control circuit terminal 2 and ground. If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  19. If all circuits test normal, test or replace the reverse lamp switch.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Relay Replacement (Attached to Wire Harness)»(/chevrolet/corvette/c6-2004-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction) or «Relay Replacement (Within an Electrical Center)»(/chevrolet/corvette/c6-2004-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction)
  2. «Backup Lamp Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems)
  3. «Backup Lamp Switch Replacement»(/chevrolet/corvette/c6-2004-2014/remont/manual-trans/#manual-transmission-tremec-6-speed)
  4. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Dome Light Switch Signal333
Left Front Door Open Switch Signal444
Right Front Door Open Switch Signal444
Courtesy Lamp ControlB1480 001, 2
Courtesy Lamp Control - Left Door222
Courtesy Lamp Control - Right Door222
Courtesy Lamp Low Control21, 21, 2
I/P Dimmer Switch Ground3
I/P Compartment Lamp Ground2
Rear Compartment Lid Latch Assembly Ground2
Rear Compartment Lid Pull Down Actuator Ground2
Underhood Lamp Ground2
Vanity Mirror Lamp-Right Ground2
Vanity Mirror Lamp-Left Ground2
1. Rearview Mirror Lamp(s) Inoperative - Inside 2. Courtesy Lamps Malfunction 3. Dome Lamp Switch Malfunction 4. Door Open Switch Malfunction

The CTSY/LAMP fuse supplies battery voltage to the body control module (BCM). The BCM applies battery voltage to the courtesy lamps through the courtesy lamp supply voltage circuit. When any door is opened, the jam switch contacts close and the BCM receives a door-open input. If the BCM receives a door lock or unlock input or a rear hatch open input, the BCM will activate the courtesy lamp supply voltage circuit, providing battery voltage to all of the instrument panel (I/P) courtesy lamps, rearview mirror lamps, and rear compartment lamps. The BCM also provides a serial data message to the driver door module (DDM) and passenger door module (PDM) to apply battery voltage to the exterior courtesy lamps.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

  1. Ignition ON, observe the scan tool Dome Lamp Switch parameter while pressing and releasing the dome lamp switch. The parameter should CHANGE between Off and On. If the parameter does not change between the commanded states, refer to «Dome Lamp Switch Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems__dome-lamp-switch-malfunction) .
  2. Observe the scan tool LF Door Open Switch parameter located in Keyless/Remote Start Data while opening and closing the driver door. The parameter should change between Open and Closed. If the parameter does not change between the commanded states, refer to «Door Open Switch Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems__door-open-switch-malfunction) .
  3. Observe the scan tool RF Door Open Switch parameter located in Keyless/Remote Start Data while opening and closing the passenger door. The parameter should change between Open and Closed. If the parameter does not change between the commanded states, refer to «Door Open Switch Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems__door-open-switch-malfunction) .

Dome Lamp Switch Malfunction

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

Door Open Switch Malfunction

  1. Ignition OFF, disconnect the harness connector at the inoperative door latch assembly.
  2. Ignition OFF, interior lamps OFF, doors CLOSED, test for less than 5 ohms between the appropriate ground circuit terminal listed below and ground. Driver door latch ground terminal 8 Passenger door latch ground terminal 3 If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool Door Open Switch parameter is Closed. If not the specified value, test the appropriate signal circuit terminal listed below for a short to ground. If the circuit tests normal, replace the BCM. Driver door open switch signal terminal 7 Passenger door open switch signal terminal 2
  4. Install a 3A fused jumper wire between the appropriate signal circuit terminal listed below and ground. Verify the scan tool Door Open Switch parameter is Door Closed. Driver door open switch signal terminal 7 Passenger door open switch signal terminal 2 If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the inoperative door latch assembly.

Instrument Panel (I/P) Compartment Lamp Malfunction

  1. Ignition OFF, disconnect the harness connector at the I/P compartment lamp.
  2. Ignition OFF, test for less than 1 ohm between the ground circuit terminal B and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the control circuit terminal A and ground. If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  4. If all circuits test normal, replace the I/P compartment lamp switch.

Instrument Panel Courtesy Lamps Malfunction

  1. Ignition OFF, disconnect the harness connector at the inoperative courtesy lamp.
  2. Ignition OFF, test for less than 1 ohm between the control circuit terminal B and ground. If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  3. Ignition ON, verify that a test lamp illuminates between the control circuit terminal A and ground. If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  4. Ignition OFF, connect a test lamp between the control circuit terminal A and the control circuit terminal B.
  5. Command the Interior Lamps ON with a scan tool. The test lamp should turn ON for 5 seconds and then turn OFF. If the test lamps always ON, test the control circuit terminal B for a short to ground. If the circuit test normal, replace the BCM.
  6. If all circuits test normal, replace the inoperative courtesy lamp.

Rear Compartment Courtesy Lamps Malfunction

  1. Ignition OFF, disconnect the harness connector at the inoperative rear compartment lamp.
  2. Ignition OFF, exterior lamps OFF, rear compartment lid OPEN, test for less than 5 ohms between the ground circuit terminal B and ground. If greater than the specified range, test the ground circuit for an open/high resistance, if the circuits test normal, replace the rear compartment lid latch or pull down actuator.
  3. Ignition ON, verify that a test lamp illuminates between the control circuit terminal A and ground. If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  4. If all circuits test normal, replace the inoperative rear compartment lamp.

Underhood Lamp Malfunction

  1. Ignition OFF, disconnect the harness connector at the underhood lamp.
  2. Ignition OFF, test for less than 5 ohms between the ground circuit terminal B and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the control circuit terminal A and ground. If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  4. If all circuits test normal, replace the underhood lamp.

Vanity Mirror Lamps Malfunction

  1. Ignition OFF, disconnect the harness connector at the inoperative vanity mirror.
  2. Ignition OFF, scan tool OFF, interior lamps OFF, test for less than 1 ohm between the ground circuit terminal B and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the control circuit terminal A and ground. If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  4. If all circuits test normal, replace the inoperative vanity mirror.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Door Lock Replacement»(/chevrolet/corvette/c6-2004-2014/remont/door-locks-anti-theft-systems/#door-lock-system-door-handles)
  2. «Sunshade Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exteriorinterior-trim/#interior-trim-and-paneling)
  3. «Cargo Lamp Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems)
  4. «Instrument Panel Courtesy Lamp Bulb Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems)
  5. «Instrument Panel Lamp Dimmer Switch Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems)
  6. «Instrument Panel Compartment Lamp Switch Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems)
  7. «Rear Compartment Lift Window Latch Replacement»(/chevrolet/corvette/c6-2004-2014/remont/heated-glassdefoggers/#fixed-and-moveable-window-system)
  8. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM or IPC replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Ambient Light Sensor SignalB2646B2646B2646
Driver Sun Load Sensor SignalB0184B0184B0184
Passenger Sun Load Sensor SignalB0189B0189B0189
Left Front Turn Signal Lamp ControlB3948 02B3948 05B3948 05
Right Front Turn Signal Lamp ControlB3949 02B3949 05B3949 05
Sunload Sensor Assembly Low ReferenceB0184, B0189, 2B0184, B0189, 2
Turn Signal Lamp - LF Ground11
Turn Signal Lamp - RF Ground11
1. Turn Signal Lamps and/or Indicators Malfunction 2. Daytime Running Lamps Malfunction

The ambient light sensor is used to monitor outside lighting conditions. The ambient light sensor provides a voltage signal that will vary between 0.2-4.9 volts depending on outside lighting conditions. The HVAC control module provides a low reference ground and a 5-volt reference signal to the ambient light sensor. The HVAC control module monitors the ambient light sensor signal circuit to determine if outside lighting conditions are correct for either daytime running lights (DRL) or automatic lamp control (ALC) when the headlamp switch is in the AUTO position. The HVAC control module sends a signal to the body control module (BCM) via serial data commanding the BCM to turn the front turn signal lamps on steady (non-flashing). Any function or condition that turns on the headlamps will cancel the DRL operation. With the turn signal/multifunction switch in the OFF position, the turn signal lamps will either be turned ON or OFF after a 30-second delay, depending on whether daylight or low light conditions are sensed by the ambient light sensor.

IMPORTANTThis diagnostic procedure assumes that the turn signal lamps are operating within specifications. If the turns signal lamps are inoperative, diagnose the turn signal malfunction before proceeding with the following diagnostic. Refer to Turn Signal Lamps and/or Indicators Malfunction .

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, verify with a scan tool the Park Brake Switch parameter displays Released.

  1. If not the specified value, refer to «Symptoms - Hydraulic Brakes»(/chevrolet/corvette/c6-2004-2014/remont/mechanical-hydraulic/#hydraulic-brake-system__symptoms-hydraulic-brakes) .
  1. Ignition OFF, disconnect the harness connector at the sunload sensor assembly.
  2. Ignition OFF, scan tool OFF, doors CLOSED, test for less than 20 ohms between the low reference circuit terminal C and ground. If greater than the specified range, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the HVAC control module.
  3. Install a 3A fused jumper wire between the signal circuit terminal D and the low reference circuit terminal C. Verify the scan tool Day/Night Status parameter is Day. If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  4. If all circuits test normal, replace the sunload sensor assembly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Sun Load Temperature Sensor Replacement»(/chevrolet/corvette/c6-2004-2014/remont/automatic-hvac-system/#hvac-system-automatic)
  2. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM or HVAC control module replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Front Fog Lamp Switch Signal222
Front Fog Lamp Relay ControlB2530 02B2530 05B2530 05
Front Fog Lamp Control111
Front Fog Lamp Relay Ground11
Fog Lamp - LF Ground11
Fog Lamp - RF Ground11
Fog Lamp Switch Ground22
1. Front Fog Lamps Malfunction 2. Front Fog Lamp Switch Malfunction

The front fog lamp switch signal circuit is grounded momentarily by pressing the front fog lamp switch. The body control module (BCM) energizes the front fog lamp relay by applying battery voltage to the front fog lamp relay control circuit. When the front fog lamp relay is energized, battery voltage is applied via the FOG LAMP fuse to the front fog lamp supply voltage circuit which illuminates the front fog lamps. The BCM sends a serial data message to the instrument panel cluster (IPC) to enable the front fog lamp indicator.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, observe the scan tool Front Fog Lamp Switch parameter while pressing and releasing the front fog lamp switch. The reading should toggle between Active and Inactive.

  1. If the reading does not change between the commanded states, refer to «Front Fog Lamp Switch Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems__front-fog-lamp-switch-malfunction) .

Front Fog Lamp Switch Malfunction

  1. Ignition OFF, disconnect the X1 harness connector at the turn signal/multifunction switch.
  2. Verify that a test lamp illuminates between B+ and the ground circuit terminal 3. If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool Front Fog Lamp Switch parameter is Inactive. If not the specified value, test the signal circuit terminal 4 for a short to ground. If the circuit tests normal, replace the BCM.
  4. Install a 3A fused jumper wire between the signal circuit terminal 4 and the ground circuit terminal 3. Verify the scan tool Front Fog Lamp Switch parameter is Active. If not the specified value, test the signal circuit terminal 4 for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the turn signal/multifunction switch.

Front Fog Lamps Malfunction

  1. Ignition OFF, disconnect the front fog lamp relay.
  2. Test for less than 5 ohms between the ground circuit terminal C3 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal C4 and ground. If the test lamp illuminates, test the control circuit for a short to voltage.
  4. Verify that a test lamp illuminates between the B+ circuit terminal A3 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the control circuit terminal C4 for a short to ground. If the circuit tests normal, test or replace the front fog lamp relay.
  5. Disconnect the harness connector at the Inoperative front fog lamp.
  6. Ignition OFF, scan tool OFF, exterior lamps OFF, test for less than 5 ohms between the ground circuit terminal B and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  7. Connect the harness connector at the inoperative front fog lamp.
  8. Connect a 15A fused jumper wire between the B+ circuit terminal A3 and the control circuit terminal C4. Verify the front fog lamps are activated. If the front fog lamps do not activate, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the inoperative front fog lamp.
  9. Connect a test lamp between the control circuit terminal A4 and ground.
  10. Command the front fog lamps ON and OFF with the front fog lamp switch. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM. If the test lamp is always OFF, test the control circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the BCM.
  11. If all circuits test normal, test or replace the front fog lamp relay.

Front Fog Lamp Indicator Malfunction

Ignition ON, with a scan tool perform the display test for the IPC and observe the front fog lamp indicator.

  1. If the front fog lamp indicator illuminates during the test, replace the BCM.
  2. If the front fog lamp indicator does not illuminate during the test or remains illuminated at all times, replace the IPC.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Front Fog Lamp Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems)
  2. «Underhood Electrical Center or Junction Block Replacement»(/chevrolet/corvette/c6-2004-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction)
  3. «Relay Replacement (Attached to Wire Harness)»(/chevrolet/corvette/c6-2004-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction) or «Relay Replacement (Within an Electrical Center)»(/chevrolet/corvette/c6-2004-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction)
  4. «Turn Signal Multifunction Switch Replacement»(/chevrolet/corvette/c6-2004-2014/remont/steering-column-switches/#steering-wheel-and-steering-column)
  5. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM or IPC replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Rear Fog Lamp Relay B+11
Rear Fog Lamp Switch Signal222
Rear Fog Lamp Relay ControlB2540 02B2540 05B2540 05
Rear Fog Lamp Control111
Fog Lamp - LR Ground11
Fog Lamp - RR Ground11
Fog Lamp Switch Ground22
1. Rear Fog Lamps Malfunction 2. Rear Fog Lamp Switch Malfunction

The rear fog lamp switch signal circuit is grounded momentarily by pressing the rear fog lamp switch. The body control module (BCM) energizes the rear fog lamp relay by applying ground to the rear fog lamp relay control circuit. When the rear fog lamp relay is energized, battery voltage is applied via the REAR FOG/ALDL TOP SW fuse to the rear fog lamp supply voltage circuit which illuminates the rear fog lamps.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, observe the scan tool Rear Fog Lamp Switch parameter while pressing and releasing the rear fog lamp switch. The parameter should change between Active and Inactive.

  1. If the parameter does not change between the commanded states, refer to «Rear Fog Lamp Switch Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems__rear-fog-lamp-switch-malfunction) .
  2. If the parameter changes between the commanded states, refer to «Rear Fog Lamps Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems) .

Rear Fog Lamp Switch Malfunction

  1. Ignition OFF, disconnect the X1 harness connector at the turn signal/multifunction switch.
  2. Ignition OFF, verify that a test lamp illuminates between B+ and the ground circuit terminal 3. If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool Rear Fog Lamp Switch parameter is Inactive. If not the specified value, test the signal circuit terminal 2 for a short to ground. If the circuit tests normal, replace the BCM.
  4. Install a 3A fused jumper wire between the signal circuit terminal 2 and the ground circuit terminal 3. Verify the scan tool Rear Fog Lamp Switch parameter is Active. If not the specified value, test the signal circuit terminal 2 for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the turn signal/multifunction switch.

Rear Fog Lamps Malfunction

  1. Ignition OFF, disconnect the rear fog lamp relay.
  2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal B6 and ground. If the test lamp illuminates, test the control circuit for a short to voltage.
  3. Verify that a test lamp illuminates between the relay switch B+ circuit terminal A4 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ fuse is open, test the control circuit terminal B6 for a short to ground. If the circuit tests normal, test or replace the rear fog lamp relay.
  4. Verify that a test lamp illuminates between the B+ circuit terminal B4 and ground. If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
  5. Disconnect the harness connector at the inoperative rear fog lamp.
  6. Ignition OFF, exterior lamps OFF, test for less than 5 ohms between the inoperative rear fog lamp ground circuit terminal 1 and ground If greater than the specified range, test the ground circuit for an open/high resistance.
  7. Connect the harness connector at the inoperative rear fog lamp.
  8. Connect a 10A fused jumper wire between the B+ circuit terminal A4 and the control circuit terminal B6. Verify the rear fog lamps are illuminated. If the rear fog lamps do not illuminate, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the inoperative rear fog lamp.
  9. Connect a test lamp between the B+ circuit terminal B4 and the control circuit terminal A6.
  10. Command the Rear Fog Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM. If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  11. If all circuits test normal, test or replace the rear fog lamp relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Relay Replacement (Attached to Wire Harness)»(/chevrolet/corvette/c6-2004-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction) or «Relay Replacement (Within an Electrical Center)»(/chevrolet/corvette/c6-2004-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction)
  2. «Turn Signal Multifunction Switch Replacement»(/chevrolet/corvette/c6-2004-2014/remont/steering-column-switches/#steering-wheel-and-steering-column)
  3. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Hazard Switch Signal111
Hazard Flasher Signal222
Instrument Panel Lamps Control333
Hazard Switch Ground11
1. Hazard Lamps Malfunction 2. Hazard Lamp Indicators Malfunction 3. Interior Backlighting Malfunction

The hazard flashers may be activated in any power mode. The hazard switch is permanently grounded through G201. When the hazard switch is placed in the ON position, ground is applied through the hazard switch signal circuit to the body control module (BCM). The BCM supplies battery voltage to all four turn signal lamps in an ON and OFF duty cycle. When the hazard switch is activated, the instrument panel cluster (IPC) hazard flasher signal circuit is grounded and the IPC request both turn signal indicators to be cycled ON and OFF.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Hazard Lamps Malfunction

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

Hazard Lamp Indicators Malfunction

  1. Ignition OFF, disconnect the harness connector at the hazard switch.
  2. Ignition OFF, verify that a test lamp illuminates between B+ and the ground circuit terminal 2. If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the signal circuit terminal 4 and ground. If the test lamp does not illuminate, test the signal circuit for a short to ground or an open/high resistance.
  4. Install a 3A fused jumper wire between the signal circuit terminal 4 and ground. Verify the hazard lamp indicators are Illuminated. If the hazard flashers are not illuminated, test the signal circuit for a short to voltage. If the circuit tests normal, replace the IPC.
  5. If all circuits test normal, test or replace the hazard switch.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Hazard Warning Switch Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems)
  2. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM or IPC replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Headlamp Switch High Beam Signal111
Headlamp Switch Headlamps On Signal111
Headlamp Switch Headlamps Off Signal111
Flash to Pass Switch Signal111
Headlamp High Beam Relay ControlB2580 06B2580 06B2580 01
Headlamp Low Beam Relay Control222
LF High Beam Headlamp Control333
LF Low Beam Headlamp Control222
RF High Beam Headlamp Control333
RF Low Beam Headlamp Control222
LF Headlamp Ground2, 32, 3
RF Headlamp Ground2, 32, 3
Turn Signal/Multifunction Switch Ground11
1. Headlamp Switch Malfunction 2. Headlamps Malfunction - Low Beam 3. Headlamps Malfunction - High Beam

With the headlamp switch in the ON position, the headlamp switch headlamp ON signal circuit is grounded through the turn signal/multifunction switch at G201. In response to this input, the body control module (BCM) provides ground to either the headlamp low beam relay control circuit or the headlamp high beam relay control circuit. The position of the headlamp dimmer switch determines which relay coil has ground. The BCM supplies ground to the relay coil circuits, if the headlamps are necessary. The underhood fuse block supplies battery positive voltage to both relay switch circuits. When the headlamp high beam relay coil is energized, current flows through the LT HI BEAM and the RT HI BEAM fuses to the high beam headlamps. With the headlamp dimmer switch in the high beam position the BCM sends a message via serial data to the instrument panel cluster (IPC) requesting the IPC to illuminate the high beam indicator.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON, observe the scan tool Headlamp Off Switch parameter while turning the headlamp switch ON and OFF. The parameter should change between Off and On. If the parameter does not change between the commanded states, refer to «Headlamp Switch Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems__headlamp-switch-malfunction) .
  2. Observe the scan tool Flash To Pass Switch parameter while applying and releasing the flash to pass switch. The parameter should change between Active and Inactive. If the parameter does not change between the commanded states, refer to «Headlamp Switch Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems__headlamp-switch-malfunction) .
  3. Observe the scan tool High Beam Select Switch parameter while applying and releasing the high beam select switch. The parameter should change between Active and Inactive. If the parameter does not change between the commanded states, refer to «Headlamp Switch Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems__headlamp-switch-malfunction) .
  4. Observe the scan tool Headlamp On Switch parameter while turning the headlamp switch ON and OFF. The parameter should change between Active and Inactive. If the parameter does not change between the commanded states, refer to «Headlamp Switch Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems__headlamp-switch-malfunction) .

Headlamp Switch Malfunction

  1. Ignition OFF, disconnect the X2 and X3 harness connectors at the turn signal/multifunction switch.
  2. Ignition OFF, verify that a test lamp illuminates between B+ and the ground circuit terminal K. If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
  3. Ignition OFF, verify that a test lamp illuminates between B+ and the ground circuit terminal B. If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
  4. Ignition ON, verify the scan tool Headlamp Off Switch parameter is Off. If not the specified value, test the signal circuit terminal N for a short to ground. If the circuit tests normal, replace the BCM.
  5. Verify the scan tool Flash To Pass Switch parameter is Inactive. If not the specified value, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the BCM.
  6. Verify the scan tool High Beam Select Switch parameter is Inactive. If not the specified value, test the signal circuit terminal E for a short to ground. If the circuit tests normal, replace the BCM.
  7. Verify the scan tool Headlamp On Switch parameter is Inactive. If not the specified value, test the signal circuit terminal L for a short to ground. If the circuit tests normal, replace the BCM.
  8. Install a 3A fused jumper wire between the signal circuit terminal N and ground. Verify the scan tool headlamp off switch parameter is On. If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  9. Install a 3A fused jumper wire between the signal circuit terminal A and ground. Verify the scan tool flash to pass switch parameter is Active. If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  10. Install a 3A fused jumper wire between the signal circuit terminal E and ground. Verify the scan tool high beam select switch parameter is Active. If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  11. Install a 3A fused jumper wire between the signal circuit terminal L and ground. Verify the scan tool headlamp on switch parameter is Active. If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  12. If all circuits test normal, test or replace the turn signal/multifunction switch.

Headlamps Malfunction-Low Beam

  1. Ignition OFF, disconnect the low beam relay.
  2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal M3 and ground. If the test lamp illuminates, test the control circuit for a short to voltage.
  3. Verify that a test lamp illuminates between the B+ circuit terminal K3 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the control circuit terminal M3 for a short to ground. If the circuit tests normal, test or replace the low beam relay.
  4. Verify that a test lamp illuminates between the B+ circuit terminal K2 and ground. If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
  5. Disconnect the harness connector at the inoperative low beam headlamp.
  6. Ignition OFF, scan tool OFF, exterior lamps OFF, test for less than 5 ohms between the ground circuit terminal B and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  7. Connect the harness connector at the inoperative low beam headlamp.
  8. Connect a 40A fused jumper wire between the B+ circuit terminal K2 and the control circuit terminal M3. Verify the low beam headlamps illuminate. If the low beam headlamps do not illuminate, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the inoperative low beam headlamp.
  9. Connect a test lamp between the B+ circuit terminal K3 and the control circuit terminal M2.
  10. Command the low beam headlamps ON and OFF with the headlamp switch. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM. If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  11. If all circuits test normal, test or replace the low beam relay.

Headlamps Malfunction-High Beam

  1. Ignition OFF, disconnect the high beam relay.
  2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal H2 and ground. If the test lamp illuminates, test the control circuit for a short to voltage.
  3. Verify that a test lamp illuminates between the B+ circuit terminal F1 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the control circuit terminal H2 for a short to ground. If the circuit tests normal, test or replace the high beam relay.
  4. Verify that a test lamp illuminates between the B+ circuit terminal F2 and ground. If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
  5. Disconnect the harness connector at the inoperative high beam headlamp.
  6. Ignition OFF, scan tool OFF, exterior lamps OFF, test for less than 5 ohms between the ground circuit terminal B and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  7. Connect the harness connector at the inoperative high beam headlamp.
  8. Connect a 20A fused jumper wire between the B+ circuit terminal F1 and the control circuit terminal H2. Verify the high beam headlamps illuminate. If the high beam headlamps do not illuminate, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the inoperative high beam headlamp.
  9. Connect a test lamp between the B+ circuit terminal F2 and the control circuit terminal H1.
  10. Command the high beam headlamps ON and OFF with the high beam switch. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM. If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  11. If all circuits test normal, test or replace the high beam relay.

High Beam Indicator Malfunction

Ignition ON, with a scan tool perform the Display Test for the IPC and observe the high beam indicator.

  1. If the high beam indicator illuminates during the test, replace the BCM.
  2. If the high beam indicator does not illuminate during the test or remains illuminated at all times, replace the IPC.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «High Intensity Discharge Headlamp Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems)
  2. «High Intensity Discharge Headlamp Ballast Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems)
  3. «Relay Replacement (Attached to Wire Harness)»(/chevrolet/corvette/c6-2004-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction) or «Relay Replacement (Within an Electrical Center)»(/chevrolet/corvette/c6-2004-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction)
  4. «Underhood Electrical Center or Junction Block Replacement»(/chevrolet/corvette/c6-2004-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction)
  5. «Turn Signal Multifunction Switch Replacement»(/chevrolet/corvette/c6-2004-2014/remont/steering-column-switches/#steering-wheel-and-steering-column)
  6. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM or IPC replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Instrument Panel Lamps Dimmer Select Switch Signal22
Instrument Panel Lamps Dimmer Switch Down Signal222
Instrument Panel Lamps Dimmer Switch Up Signal222
Instrument Panel Lamps Control111
Park Lamp Control313
I/P Dimmer Switch Ground1, 21, 2
1. Interior Backlighting Malfunction 2. Dimmer Switch Malfunction 3. Park, License, and/or Tail Lamps Malfunction

The instrument panel cluster (IPC) receives an input from the I/P dimmer switch. The IPC provides the I/P dimmer switch with battery positive voltage and ground. The I/P dimmer switch is a potentiometer that varies the input signal voltage to the IPC. This input determines the intensity level of the backlighting illumination. The driver may change intensity of the backlighting by positioning the I/P dimmer switch between the minimum and maximum settings. The IPC will default to full intensity if the input from the I/P dimmer switch is not within the specified values. The backlighting illumination intensity is controlled by the IPC by varying the pulse width modulation (PWM) voltage that feeds the dimming signal circuits of the individual lamps. All interior backlighting lamps are permanently grounded.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON, observe the scan tool Dim Down Switch parameter while pressing and releasing the dim down switch. The parameter should change between Active and Inactive. If the parameter g does not change between the commanded states, refer to «Dimmer Switch Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems__dimmer-switch-malfunction) .
  2. Observe the scan tool Dim Up Switch parameter while pressing and releasing the dim up switch. The parameter should change between Active and Inactive. If the parameter does not change between the commanded states, refer to «Dimmer Switch Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems__dimmer-switch-malfunction) .
  3. If the dimmer switch functions as specified, refer to «Interior Backlighting Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems) .

Interior Backlighting Malfunction

  1. Ignition ON, install a scan tool and observe the Park Lamps Signal parameter in the IPC data list while turning the parks lamps ON and OFF. The parameter should change between Off and On. If the parameter is always ON, test the park lamp supply voltage circuit at connector X2 terminal 7 for a short to voltage. If the circuit tests normal, replace the IPC. If the parameter is always OFF, test the park lamp supply voltage circuit at connector X2 terminal 7 for a short to ground or and open/high resistance. If the circuit tests normal, replace the IPC.
  2. Ignition OFF, disconnect the harness connector at the component with the inoperative backlighting.
  3. Ignition OFF, verify that a test lamp illuminates between B+ the ground circuit. If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
  4. Connect a test lamp between the control circuit and ground.
  5. Command the park lamps ON and OFF with the park lamps switch. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the control module associated with the inoperative backlight. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the control module associated with the inoperative backlight.
  6. If all circuits test normal, test or replace the component with the inoperative backlighting.

Dimmer Switch Malfunction

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

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Head Up Display Switch Replacement»(/chevrolet/corvette/c6-2004-2014/remont/gauges-instrument-panels/#instrument-panel-system-displays-gauges)
  2. «Driver Information Display Switch Replacement»(/chevrolet/corvette/c6-2004-2014/remont/gauges-instrument-panels/#instrument-panel-system-displays-gauges)
  3. «Hazard Warning Switch Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems)
  4. «Instrument Panel Lamp Dimmer Switch Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems)
  5. «Front Side Door Window Switch Replacement - Left Side»(/chevrolet/corvette/c6-2004-2014/remont/heated-glassdefoggers/#fixed-and-moveable-window-system)
  6. «Front Side Door Window Switch Replacement - Right Side»(/chevrolet/corvette/c6-2004-2014/remont/heated-glassdefoggers/#fixed-and-moveable-window-system)
  7. «Rear Compartment Lid and Fuel Filler Door Release Switch Replacement»(/chevrolet/corvette/c6-2004-2014/remont/door-locks-anti-theft-systems/#door-lock-system-door-handles)
  8. «Folding Top Switch Replacement»(/chevrolet/corvette/c6-2004-2014/remont/sun-rooft-topconvertible-top/#folding-top-system)
  9. «Door Lock Switch Replacement - Driver Door»(/chevrolet/corvette/c6-2004-2014/remont/door-locks-anti-theft-systems/#door-lock-system-door-handles)
  10. «Door Lock Switch Replacement - Passenger Front»(/chevrolet/corvette/c6-2004-2014/remont/door-locks-anti-theft-systems/#door-lock-system-door-handles)
  11. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM, DDM, HVAC, IPC, or PDM replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Flash to Pass Switch Signal111
Headlamp Switch High Beam Signal111
Headlamp Switch Headlamps On Signal111
Headlamp Switch Headlamps Off Signal111
Headlamp High Beam Relay ControlB2580 06B2580 06B2580 01
Headlamp Low Beam Relay Control111
LF High Beam Headlamp Control111
LF Low Beam Headlamp Control111
RF High Beam Headlamp Control111
RF Low Beam Headlamp Control111
LF Headlamp Ground11
RF Headlamp Ground11
Turn Signal/Multifunction Switch Ground11
1. Headlamps Malfunction

The ambient light sensor is a light sensitive transistor that varies the voltage signal to the HVAC control module. The HVAC control module sends a signal to the body control module (BCM) via serial data commanding the BCM to apply ground to the headlamp low beam relay control circuit. This energizes the low beam relay, closing the switched side and applies battery voltage to the LEFT and RIGHT LOW BEAM fuses. Battery voltage is applied from the low beam fuses, through the low beam voltage supply circuits to the ballast in the headlamp assembly illuminating the headlamps. The BCM also sends a serial data message to the instrument panel cluster (IPC) requesting the Lights On indicator be illuminated.

This diagnostic procedure assumes that the headlamps operate as described in Exterior Lighting Systems Description and Operation .

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, with a scan tool perform the Display Test for the IPC and observe the lights on indicator.

  1. If the lights on indicator illuminates during the test, replace the BCM.
  2. If the lights on indicator does not illuminate during the test or remains illuminated at all times, replace the IPC.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for BCM or IPC replacement, setup, and programming

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Park Lamp Switch ON Signal222
Park Lamp Relay ControlB2585 06B2585 06B2585 01
License Lamp Control111
Park Lamp Control111
License Lamp Ground11
Park Lamps - LF Ground11
Park Lamps - RF Ground11
Tail/Stop and Turn Signal Lamps - LR Ground11
Tail/Stop and Turn Signal Lamps - RR Ground11
Turn Signal/Multifunction Switch Ground22
1. Park, License, and/or Tail Lamps Malfunction 2. Park Lamp Switch Malfunction

Battery positive voltage is applied at all times from the PARK LAMPS fuse to both the coil and switched sides of the PARK LAMP Relay in the underhood electrical center. Ground is applied from G201 to the multifunction switch at all times. When the headlamp switch is place in either the HEAD or PARK position, ground is applied to the park lamp relay control circuit. This energizes the PARK LAMP Relay and applies battery positive voltage to all of the park, tail, license, marker, and position lamps.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, observe the scan tool Park Lamp Switch parameter while turning the park lamp switch ON and OFF. The parameter should change between On and Off.

  1. If the parameter does not change between the commanded states, refer to «Park Lamp Switch Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems__park-lamp-switch-malfunction) .
  2. If the parameter changes between the commanded states, refer to «Park, License, and/or Tail Lamps Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems) .

Park Lamp Switch Malfunction

  1. Ignition OFF, disconnect the X3 harness connector at the turn signal/multifunction switch.
  2. Ignition OFF, verify that a test lamp illuminates between B+ and the ground circuit terminal K. If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool Park Lamp Switch parameter is Off. If not the specified value, test the signal circuit terminal M for a short to ground. If the circuit tests normal, replace the BCM.
  4. Install a 3A fused jumper wire between the signal circuit terminal M and ground. Verify the scan tool Park Lamp Switch parameter is On. If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the turn signal/multifunction switch.

Park, License, and/or Tail Lamps Malfunction

  1. Ignition OFF, disconnect the park lamp relay.
  2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal C9 and ground. If the test lamp illuminates, test the control circuit for a short to voltage.
  3. Verify that a test lamp illuminates between the B+ circuit terminal A8 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the control circuit terminal C9 for a short to ground. If the circuit tests normal, test or replace the park lamp relay.
  4. Verify that a test lamp illuminates between the B+ circuit terminal A9 and ground. If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
  5. Disconnect the harness connector at the inoperative park lamp.
  6. Ignition OFF, scan tool OFF, exterior lamps OFF, test for less than 5 ohms between the ground circuit and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  7. Connect the harness connector at the inoperative park lamp.
  8. Connect a 10A fused jumper wire between the B+ circuit terminal A8 and the control circuit terminal C9. Verify the park lamps illuminate. If the park lamps do not illuminate, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the inoperative park lamp.
  9. Connect a test lamp between the B+ circuit terminal A9 and the control circuit terminal C8.
  10. Command the parks lamps ON and OFF with the park lamp switch. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM. If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  11. If all circuits test normal, test or replace the park lamp relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Rear License Plate Lamp Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems)
  2. «Repeater Lamp Replacement (T90)»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems)
  3. «Tail Lamp Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems)
  4. «Front Side Marker Lamp Replacement (Domestic)»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems) or «Front Side Marker Lamp Replacement (Export)»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems)
  5. «Rear Side Marker Lamp Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems)
  6. «Relay Replacement (Attached to Wire Harness)»(/chevrolet/corvette/c6-2004-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction) or «Relay Replacement (Within an Electrical Center)»(/chevrolet/corvette/c6-2004-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction)
  7. «Turn Signal Multifunction Switch Replacement»(/chevrolet/corvette/c6-2004-2014/remont/steering-column-switches/#steering-wheel-and-steering-column)
  8. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Dome Light Switch Signal222
Left Front Door Open Switch Signal222
Right Front Door Open Switch Signal222
Courtesy Lamp ControlB1480 001, 2
Courtesy Lamp Low Control21, 21, 2
Inside Rearview Mirror Ground1
I/P Dimmer Switch Ground2
I/P Compartment Lamp Ground2
Rear Compartment Lid Latch Assembly Ground2
Rear Compartment Lid Pull Down Actuator Ground2
Underhood Lamp Ground2
Vanity Mirror Lamp-Right Ground2
Vanity Mirror Lamp-Left Ground2
1. Rearview Mirror Lamp(s) Inoperative - Inside 2. Courtesy Lamps Malfunction

The CTSY/LAMP fuse supplies battery voltage to the body control module (BCM). The BCM applies battery voltage to the courtesy lamps through the courtesy lamp supply voltage circuit. When any door is opened, the jam switch contacts close and the BCM receives a door-open input. If the BCM receives a door lock or unlock input or a rear hatch open input, the BCM will activate the courtesy lamp supply voltage circuit, providing battery voltage to all of the instrument panel (I/P) courtesy lamps, rearview mirror lamps, and rear compartment lamps. The BCM also provides a serial data message to the driver door module (DDM) and passenger door module (PDM) to apply battery voltage to the exterior courtesy lamps.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, disconnect the harness connector at the inside rearview mirror.
  2. Ignition OFF, scan tool OFF, interior lamps OFF, test for less than 1 ohm between the ground circuit terminal 8 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition OFF, test for less than 1 ohm between the control circuit terminal 1 and ground. If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  4. Ignition ON, verify that a test lamp illuminates between the control circuit terminal 6 and ground. If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, replace the inside rearview mirror.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Inside Rearview Mirror Replacement (DD8)»(/chevrolet/corvette/c6-2004-2014/remont/mirrors/#mirror-system) or «Inside Rearview Mirror Replacement (Except DD8)»(/chevrolet/corvette/c6-2004-2014/remont/mirrors/#mirror-system)
  2. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Brake Position Sensor 5-Volt ReferenceC0870 03C0870 03C0870 07
Stop Lamp Relay Switch B+22
Brake Position Sensor SignalC0277 06C0277 06C0277 07C0277 09
Stop Lamp Switch SignalP0572P0573P0573
Stop Lamp Relay Control222
Brake Position Sensor Low ReferenceC0277 06C0277 07
Left Rear Stop/Turn Lamp Supply Voltage111
Right Rear Stop/Turn Lamp Supply Voltage111
Center High Mounted Stop Lamp (CHMSL) Ground22
Left Rear Stop/Turn Lamp Ground11
Right Rear Stop/Turn Lamp Ground11
1. Stop Lamps Malfunction 2. High Mounted Stop Lamp Malfunction

The brake pedal position sensor is used to sense the action of the driver application of the brake pedal. The brake pedal position sensor provides an analog voltage signal that will increase as the brake pedal is applied. The body control module (BCM) provides a low reference signal and a 5-volt reference voltage to the brake pedal position sensor. When the variable signal reaches a voltage threshold indicating the brakes have been applied, the BCM will apply battery positive voltage to the stop lamps, transmission control module (TCM), engine control module (ECM), and stop lamp relay coil. The BCM also supplies the stop lamp relay coil with ground. When the stop lamp relay receives battery voltage and ground from the BCM, the relay coil is energized and the stop lamp relay switch contacts close applying battery voltage to the center high mounted stop lamp (CHMSL). Ground for the stop lamps and CHMSL are provided at G302.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Stop Lamps Malfunction

  1. Ignition OFF, disconnect harness connector at the inoperative stop lamp.
  2. Ignition OFF, exterior lamps OFF, test for less than 5 ohms between the ground circuit and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the control circuit and the ground circuit.
  4. Command the Stop Lamp Relay Control ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, replace the inoperative stop lamp.

High Mounted Stop Lamp Malfunction

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

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «High Mount Stop Lamp Replacement (ZR1)»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems) or «High Mount Stop Lamp Replacement (Z06)»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems)
  2. «Tail Lamp Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems)
  3. «Relay Replacement (Attached to Wire Harness)»(/chevrolet/corvette/c6-2004-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction) or «Relay Replacement (Within an Electrical Center)»(/chevrolet/corvette/c6-2004-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction)
  4. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Hazard Switch Signal222
Left Turn Signal Switch Signal333
Right Turn Signal Switch Signal333
Left Front Turn Signal Lamp ControlB3948 02B3948 05B3948 05
Right Front Turn Signal Lamp ControlB3949 02B3949 05B3949 05
Left Rear Turn Lamp ControlB3950 02B3950 05B3950 05
Right Rear Turn Lamp ControlB3951 02B3951 05B3951 05
Hazard Switch Ground22
Left Rear Stop/Turn Lamp Ground11
Repeater Lamp-Left Ground11
Repeater Lamp-Right Ground11
Right Rear Stop/Turn Lamp Ground11
Turn Signal/Multifunction Switch Ground33
Turn Signal Lamp - LF Ground11
Turn Signal Lamp - RF Ground11
1. Turn Signal Lamps and/or Indicators Malfunction 2. Hazard Lamps Malfunction 3. Turn Signal Switch Malfunction

Ground is applied at all times at G201 to the turn signal/multifunction switch. The turn signal lamps may only be activated with the ignition switch in the ON or START position. When the turn signal/multifunction switch is placed in either the TURN RIGHT or TURN LEFT position, ground is applied to the body control module (BCM) through either the right turn or left turn signal switch signal circuit. The BCM then applies a pulsating voltage to the front and rear turn signal lamps through there respective voltage supply circuits. Ground for the left front turn signal lamps is supplied at G101. Ground for the right front turn signal lamps is supplied at G102. Ground for the rear turn signal lamps is supplied at G302.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, observe the scan tool Right and Left Turn Signal Switch parameters while cycling the turn signal switch between the left and right positions. The parameters should change between Active and Inactive.

  1. If the parameters do not change between the commanded states, refer to «Turn Signal Switch Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems__turn-signal-switch-malfunction) .
  2. If the parameters change between the commanded states, refer to «Turn Signal Lamps Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems__turn-signal-lamps-malfunction) .

Turn Signal Switch Malfunction

  1. Ignition OFF, disconnect the X4 harness connector at the turn signal/multifunction switch.
  2. Ignition OFF, verify that a test lamp illuminates between B+ and the ground circuit terminal G. If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool Left Turn Signal Switch parameter is Inactive. If not the specified value, test the signal circuit terminal F for a short to ground. If the circuit tests normal, replace the BCM.
  4. Verify the scan tool Right Turn Signal Switch parameter is Inactive. If not the specified value, test the signal circuit terminal H for a short to ground. If the circuit tests normal, replace the BCM.
  5. Install a 3A fused jumper wire between the signal circuit terminal F and ground. Verify the scan tool Left Turn Signal Switch parameter is Active. If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  6. Install a 3A fused jumper wire between the signal circuit terminal H and ground. Verify the scan tool Right Turn Signal Switch parameter is Active. If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  7. If all circuits test normal, test or replace the turn signal/multifunction switch.

Turn Signal Lamps Malfunction

  1. Ignition OFF, disconnect the harness connector at the inoperative turn signal lamp.
  2. Ignition OFF, exterior lamps OFF, test for less than 5 ohms between the ground circuit and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the control circuit and the ground circuit.
  4. Command the appropriate Turn Signal Lamp ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the appropriate turn signal lamp assembly.

Turn Signal Indicators Malfunction

Ignition ON, with a scan tool perform the Display Test for the instrument panel cluster (IPC) and observe the turn signal lamp indicators.

  1. If the turn signal lamp indicators illuminate during the test, replace the BCM.
  2. If the turn signal lamp indicators do not illuminate during the test or remain illuminated at all times, replace the IPC.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Repeater Lamp Replacement (T90)»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems)
  2. «Tail Lamp Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems)
  3. «Turn Signal Multifunction Switch Replacement»(/chevrolet/corvette/c6-2004-2014/remont/steering-column-switches/#steering-wheel-and-steering-column)
  4. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM or IPC replacement, setup, and programming

Brake Pedal Position Sensor Calibration

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

Calibration Criteria

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

Brake pedal position sensor calibration must be performed after the brake pedal position sensor or body control module (BCM) have been serviced. The calibration procedure will set brake pedal position sensor home value. This value is used by the BCM to determine the action of the driver applying the brake system and to provide this information to the vehicle subsystems via the class 2 communication bus.

Calibration Procedure

  1. Apply the parking brake.
  2. Place the transmission in the PARK position for automatic transmission or NEUTRAL for manual transmission.
  3. Install a scan tool.
  4. Clear all BCM DTCs before proceeding.
  5. Turn ON the ignition, with the engine OFF.
  6. Navigate to the Vehicle Control Systems menu.
  7. Select Computer/Integrating Systems menu item.
  8. Select Module Setup menu item.
  9. Select BCM menu item.
  10. Select the BPP Sensor Calibration procedure and follow the directions displayed on the screen.

Brake Pedal Position Sensor Replacement

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

Removal Procedure

  1. Remove the instrument panel (I/P) insulator. Refer to «Instrument Panel Insulator Panel Replacement»(/chevrolet/corvette/c6-2004-2014/remont/gauges-instrument-panels/#instrument-panel-trim-and-console-trim) .
  2. Disengage but do not remove the connector position assurance (CPA) on the connector. Disconnect the electrical connector (2).
  3. Remove the screw.
  4. Remove the brake pedal position sensor.

Installation Procedure

  1. Apply adhesive GM P/N 12345493 (Canadian P/N 10953488) to the screw.
  2. Position the sensor fork to the pin.
  3. Rotate the sensor in order to align the sensor locator to the hole in the extension bracket.
  4. Install the brake pedal position sensor screw. Tighten: Tighten the screw to 2 N.m (18 lb in).
  5. Connect the electrical connector (2). Engage the CPA. The CPA will not engage if the connector is not attached properly.
  6. Calibrate the sensor. Refer to «Brake Pedal Position Sensor Calibration»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems__brake-pedal-position-sensor-calibration) .
  7. Install the I/P insulator. Refer to «Instrument Panel Insulator Panel Replacement»(/chevrolet/corvette/c6-2004-2014/remont/gauges-instrument-panels/#instrument-panel-trim-and-console-trim) .

Scheme 15

Scheme 15: Hazard Warning Switch Replacement
Scheme 15: Hazard Warning Switch Replacement
CalloutComponent Name
Fastener Tightening Specifications: Refer to Fastener Tightening Specifications .
1Trim Plate, Instrument Panel Accessory Refer to Instrument Panel Accessory Trim Plate Replacement .
2Switch, Hazard Warning

Scheme 16

Scheme 16: Instrument Panel Lamp Dimmer Switch Replacement
Scheme 16: Instrument Panel Lamp Dimmer Switch Replacement
CalloutComponent Name
1Instrument Panel Accessory Trim Plate Refer to Instrument Panel Accessory Trim Plate Replacement .
2Instrument Panel Dimmer Switch Tip: Use a flat-bladed tool in order to release the switch from the trim plate.
  1. Remove the instrument panel defroster grill. Refer to «Defroster Grille Replacement»(/chevrolet/corvette/c6-2004-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
  2. Twist to release the daytime running lamps (DRL) sensor from the I/P defroster grill.
  1. Twist to secure the DRL sensor to the I/P defroster grill.
  2. Connect the electrical connector to the DRL sensor.
  3. Install the instrument panel defroster grill. Refer to «Defroster Grille Replacement»(/chevrolet/corvette/c6-2004-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .

Turn Signal Flasher Replacement

The turn signal flasher is integrated into the hazard warning switch. Refer to Hazard Warning Switch Replacement .

Hazard Lamp Flasher Replacement

The hazard lamp flasher is integrated into the hazard warning switch. Refer to Hazard Warning Switch Replacement .

  1. Using a flat-bladed screwdriver or similar tool, unsnap the instrument panel (I/P) courtesy lamp from the I/P lower closeout panel.
  2. Remove the bulb from the socket, if replacing.
  1. Install the bulb to the socket, if replacing.
  2. Install the I/P courtesy lamp into the I/P lower closeout panel. Push on the lamp snapping the lamp into the panel.
  1. Remove the instrument panel (I/P) passenger compartment. Refer to «Instrument Panel Compartment Replacement»(/chevrolet/corvette/c6-2004-2014/remont/gauges-instrument-panels/#instrument-panel-trim-and-console-trim) .
  2. Depress the tabs on the sides of the I/P compartment lamp switch.
  3. Carefully push the switch and lamp unit out of the opening and remove.
  1. Position the I/P compartment lamp and switch unit into the opening in the I/P passenger compartment.
  2. Push on the switch, snapping the switch into the panel.
  3. Install the I/P passenger compartment. Refer to «Instrument Panel Compartment Replacement»(/chevrolet/corvette/c6-2004-2014/remont/gauges-instrument-panels/#instrument-panel-trim-and-console-trim) .
  1. Open the instrument panel (I/P) passenger compartment door.
  2. Reach behind the I/P compartment lamp switch, grasp the bulb, then pull the bulb to remove.
  1. Install the bulb to the socket in the back of the switch.
  2. Close the I/P passenger compartment door.
  1. Remove the lamp lens from the mirror housing. Pry carefully with a small, flat-bladed screwdriver at the rear edge (1) of the lens, furthest from the windshield.
  2. Remove the bulb from the socket.
  1. Install the bulb into the socket.
  2. Install the lamp lens to the mirror housing. Insert the forward edge of the lens (1) the edge nearest to the windshield into place and push up the rear edge to snap in place.
  1. Lower the sunshade and raise the mirror/lamp door.
  2. Insert a small flat-bladed screwdriver at the lower edge of the vanity mirror lamp lens then gently pry 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 inserting the upper edge of the lens first.
  3. Insert a small flat-bladed screwdriver at the lower edge of the vanity mirror lamp lens then gently pry up to fully install the lens.
  4. Close the lamp cover door and raise the sunshade.

Scheme 17

Scheme 17: High Intensity Discharge Headlamp Replacement
Scheme 17: High Intensity Discharge Headlamp Replacement
CalloutComponent Name
Preliminary Procedures WARNING: The high intensity discharge system produces high voltage and current. In order to reduce the risk of severe shocks and burns, the battery negative cable must be disconnected any time service work is being performed on or around the high intensity discharge system. WARNING: The high intensity discharge system produces high voltage and current. To reduce the risk of severe shocks and burns: Never open the high intensity discharge system ballast or the arc tube assembly starter. Never probe between the high intensity discharge system ballast output connector and the arc tube assembly. Open the hood. Remove the six upper fender flange bolts from the side the headlamp is being serviced from. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle . Remove the front wheelhouse liner. Refer to Front Wheelhouse Liner Replacement (Front Liner) or Front Wheelhouse Liner Replacement (Rear Liner) . Remove the front bumper fascia. Refer to Front Bumper Fascia Replacement . Remove the three lower headlamp nuts from the front wheelhouse panel. Disconnect the headlamp electrical connectors from the headlamp. Lower the vehicle. Lift the front corner of the fender and raise the fender approximately two inches, enough to lift upward on the headlamp and release the studs from the wheelhouse panel in order to remove the headlamp from the vehicle.
1Fender Flange Bolt (Qty: 6) per side CAUTION: Refer to Fastener Caution . Tighten: 10 N.m (89 lb in)
2Headlamp Nut Tighten: 2 N.m (18 lb in)
3Headlamp Assembly
WARNING
The high intensity discharge system produces high voltage and current. In order to reduce the risk of severe shocks and burns, the battery negative cable must be disconnected any time service work is being performed on or around the high intensity discharge system.
WARNING
The high intensity discharge system produces high voltage and current. To reduce the risk of severe shocks and burns: Never open the high intensity discharge system ballast or the arc tube assembly starter. Never probe between the high intensity discharge system ballast output connector and the arc tube assembly.
CAUTION
Refer to Fastener Caution .

Scheme 18

Scheme 18: High Intensity Discharge Headlamp Ballast Replacement
Scheme 18: High Intensity Discharge Headlamp Ballast Replacement
CalloutComponent Name
WARNING: The high intensity discharge system produces high voltage and current. In order to reduce the risk of severe shocks and burns, the battery negative cable must be disconnected any time service work is being performed on or around the high intensity discharge system. WARNING: The high intensity discharge system produces high voltage and current. To reduce the risk of severe shocks and burns: Never open the high intensity discharge system ballast or the arc tube assembly starter. Never probe between the high intensity discharge system ballast output connector and the arc tube assembly. Preliminary Procedure: Remove the HID headlamp assembly. Refer to High Intensity Discharge Headlamp Replacement .
1Headlamp Ballast Cover Assembly Screw (Qty: 4) CAUTION: Refer to Fastener Caution . Tighten: 3 N.m (27 lb in)
2Headlamp Ballast Cover Assembly Tip: Pull the ballast downward away from the bottom of the lamp assembly in order to disconnect the electrical connection for the ballast.
3Headlamp Ballast Screw (Qty: 3) Tighten: 3 N.m (27 lb in)
4Headlamp Ballast Assembly
WARNING
The high intensity discharge system produces high voltage and current. In order to reduce the risk of severe shocks and burns, the battery negative cable must be disconnected any time service work is being performed on or around the high intensity discharge system.
WARNING
The high intensity discharge system produces high voltage and current. To reduce the risk of severe shocks and burns: Never open the high intensity discharge system ballast or the arc tube assembly starter. Never probe between the high intensity discharge system ballast output connector and the arc tube assembly.
CAUTION
Refer to Fastener Caution .

Scheme 19

Scheme 19: Headlamp Bulb Replacement
Scheme 19: Headlamp Bulb Replacement
CalloutComponent Name
WARNING: The high intensity discharge system produces high voltage and current. In order to reduce the risk of severe shocks and burns, the battery negative cable must be disconnected any time service work is being performed on or around the high intensity discharge system. WARNING: The high intensity discharge system produces high voltage and current. To reduce the risk of severe shocks and burns: Never open the high intensity discharge system ballast or the arc tube assembly starter. Never probe between the high intensity discharge system ballast output connector and the arc tube assembly. Preliminary Procedure Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle . Remove the wheel and tire assembly. Refer to Tire and Wheel Removal and Installation . Remove the six retainers securing the headlamp access panel to the upper front wheelhouse panel. Remove the headlamp access panel in order to access the headlamp bulb covers and bulbs.
1Directional Bulb Socket Rotate the light socket and remove from the headlamp composite.
2Directional Bulb Tip: Pull the bulb straight out of the socket.
3Headlamp Bulb Cover
4Headlamp Bulb (Hi Beam)
5Headlamp Bulb Cover Tip: Pull the bulb rearward and release the electrical connector from the bulb.
6Headlamp Bulb WARNING: Refer to Halogen Bulb Warning . Tip: Rotate the bulb socket a quarter turn and remove the bulb from the headlamp.
WARNING
The high intensity discharge system produces high voltage and current. In order to reduce the risk of severe shocks and burns, the battery negative cable must be disconnected any time service work is being performed on or around the high intensity discharge system.
WARNING
The high intensity discharge system produces high voltage and current. To reduce the risk of severe shocks and burns: Never open the high intensity discharge system ballast or the arc tube assembly starter. Never probe between the high intensity discharge system ballast output connector and the arc tube assembly.
WARNING
Refer to Halogen Bulb Warning .

Scheme 20

Scheme 20: Headlamp Aiming
Scheme 20: Headlamp Aiming

Headlight aiming is only adjusted vertically. Vertical aiming of each of the composite headlamps is done by turning adjusting screws which move the headlamp capsule in relation to the headlamp frame. The vertical adjustment screw (1) is located on the inner wheelhouse.

Some state and local authorities have specific requirements for aiming the headlamps. These requirements must be followed.

Aiming Area Preparation

Choose an appropriate aiming area, then prepare the aiming screen as described in the following.

  1. The aiming area should be darkened and large enough to accommodate the vehicle and an additional 7.62 m (25 ft) measured from the face of the headlamp capsules to the front of the screen.
  2. The floor on which the vehicle rests must be flat with the bottom of the screen. If the floor is not level, compensate as necessary.
  3. The aiming screen should be at least 1.52 m (5 ft) high by 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. The screen should be provided with a vertical centerline (3), 2 laterally adjustable vertical tapes (2), and 1 vertically adjustable horizontal tape (1).
  4. Make provisions to allow the screen to be movable, so that it can be aligned parallel with the rear axle of the vehicle. This will allow for a horizontal line drawn perpendicular to the centerline of the screen to pass through the center point between the 2 headlamp capsules (4).
  5. After the aiming screen has been set up in a permanent location, paint or tape a reference line on the floor 7.62 m (25 ft) from the screen, to identify the proper location of the headlamp capsules when they are being aimed (5). If a regular commercial aiming screen is not available, the screen may consist of a vertical wall having a clear uninterrupted area at least 1.83 m (6 ft) high by 3.66 m (12 ft) wide, finished with a washable non-gloss white paint.

Vehicle Preparation

Prepare the vehicle for checking the headlamp beam aim as follows

  1. Make sure that all the components are in place on the vehicle, if other service has been performed on the vehicle.
  2. The vehicle must have a full tank of gas.
  3. Make sure the tires are inflated to the proper pressures.
  4. Stop all other operations of work on the vehicle.
  5. Position the vehicle so it is square with the aiming screen, and with the headlamp capsules directly over the reference line which has been painted or taped on the floor.
  6. Locate the vertical center line on the aiming screen (3) so that it is in line with the center of the vehicle (4). This can be accomplished by sighting through the center of the rear window and over the hood.
  7. Mark the vertical center of the front and rear windows with narrow tape. Use these marks as sights to locate the centerline of the vehicle. Move the vehicle or the screen until the center line of the screen comes into alignment with the 2 points.
  8. Close the doors.
  9. Rock the vehicle sideways to stabilize the suspension.
  10. Measure the height from the floor to the horizontal center of a headlamp capsule lens (6). Adjust the horizontal tape on the aiming screen (1) to match this dimension.
  11. Measure the distance between the centerline of the right headlamp capsule lens and the center of the left headlamp capsule lens (5). Position the vertical tapes on the aiming screen (2) this distance to the right and left of the screen centerline.

Adjustment Procedure

  1. Raise the hood.
  2. Turn on the low beam headlamps and block the light from projecting onto the screen from the passenger side headlamp.
  3. Inspect the vertical aim.
  4. Adjust the aim using the vertical adjusting screw, to align the top edge of the high intensity zone to the headlamp horizontal centerline (2), within the range of 51 mm (2 in) above (6) the lamp horizontal centerline (2), to 64 mm (2.5 in) below (5) the lamp horizontal centerline (2) on the aiming screen.
  5. Repeat the aiming procedure for the passenger side headlamp while blocking the light from projecting onto the screen from the driver side headlamp.
  6. Turn OFF the headlamps.
  7. Close the hood.

Scheme 21

Scheme 21: Front Fog Lamp Replacement
Scheme 21: Front Fog Lamp Replacement
CalloutComponent Name
Preliminary Procedures Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle . Remove the front bumper fascia. Refer to Front Bumper Fascia Replacement . Disconnect the front fog lamp bulb socket electrical connectors.
1Front Fog Lamp Mounting Screw (Qty: 3) CAUTION: Refer to Fastener Caution . Tighten: 1.5 N.m (13 lb in)
2Front Fog Lamp Tip: Lower the fog lamp in order to release the upper alignment pins from the tabs on the front fascia.
CAUTION
Refer to Fastener Caution .

Scheme 22

Scheme 22: Front Fog Lamp Bulb Replacement
Scheme 22: Front Fog Lamp Bulb Replacement
CalloutComponent Name
Preliminary Procedures Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle Remove the front portion of the wheelhouse liner. Refer to Front Wheelhouse Liner Replacement (Front Liner) or Front Wheelhouse Liner Replacement (Rear Liner) .
1Front Fog Lamp Bulb WARNING: Refer to Halogen Bulb Warning . Tip: Twist the bulb socket counterclockwise a quarter turn in order to remove from the lamp assembly.
WARNING
Refer to Halogen Bulb Warning .

Fog Lamp Aiming

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

There is no horizontal adjustment for aiming the front fog lamp assemblies on this vehicle.

  1. To ensure accurate vertical front fog lamp aiming, first perform the following steps to prepare the vehicle. Verify that all the components are in place on the vehicle, if other service has been performed on the vehicle. Verify that the fuel level is full. Place the vehicle on a level surface 7.6 m (25 ft) away from a target screen. Stop all other operations of work on the vehicle. Jounce the vehicle to settle the suspension. IMPORTANT: DO NOT cover the headlamps, this may cause excessive heat buildup. Block the light from the headlamps from projecting onto the aiming screen while aiming the fog lamps.
  2. Turn the front fog lamps ON.
  3. Insert a TORX® driver under the front fascia extension in order to reach the fog lamp vertical adjustment screw from the bottom side of the vehicle.
  4. Adjust the fog lamp up or down until the top edge of the high intensity zone on the screen is 102 mm (4 in) below the horizontal centerline (2).
  5. Turn OFF the front fog lamps.

Scheme 23

Scheme 23: Repeater Lamp Replacement (T90)
Scheme 23: Repeater Lamp Replacement (T90)
CalloutComponent Name
Fastener Tightening Specifications: Refer to Fastener Tightening Specifications .
1Front Side Marker Repeater Lamp Gently pry the lamp rearward from the front fender. Twist lamp socket counter-clockwise in order to remove the lamp socket bulb.
2Front Side Marker Repeater Lamp Electrical Connector

Scheme 24

Scheme 24: Front Side Marker Lamp Replacement (Domestic)
Scheme 24: Front Side Marker Lamp Replacement (Domestic)
CalloutComponent Name
Preliminary Procedure: Remove either the RF or LF wheelhouse liner. Refer to Front Wheelhouse Liner Replacement (Front Liner) or Front Wheelhouse Liner Replacement (Rear Liner) .
1Front Side Marker Lamp Assembly Squeeze the upper lamp assembly tabs inward and push the lens housing outward from the top of the front bumper fascia. Turn the lamp socket counterclockwise a quarter turn in order to remove the bulb (if needed).
2Front Side Marker Lamp Electrical Connector

Scheme 25

Scheme 25: Front Side Marker Lamp Replacement (Export)
Scheme 25: Front Side Marker Lamp Replacement (Export)
CalloutComponent Name
Preliminary Procedure: Remove either the RF or LF headlamp assembly. Refer to High Intensity Discharge Headlamp Replacement .
1Front Side Marker Lamp Assembly Socket Tip: Rotate the socket a quarter turn in order to remove from the headlamp.
2Front Side Marker Lamp Bulb

Scheme 26

Scheme 26: Rear Side Marker Lamp Replacement
Scheme 26: Rear Side Marker Lamp Replacement
CalloutComponent Name
Preliminary Procedure: Pull down the rear compartment side trim to access the rear side marker lamp. Refer to Rear Compartment Floor Panel Carpet Replacement (Convertible) or Rear Compartment Floor Panel Carpet Replacement (Coupe) .
1Rear Side Marker Lamp Assembly Tip: The lamp releases by pressing the tabs inward. Twist the bulb socket and pull inward to replace the bulb.

Scheme 27

Scheme 27: High Mount Stop Lamp Replacement (ZR1)
Scheme 27: High Mount Stop Lamp Replacement (ZR1)
CalloutComponent Name
Preliminary Procedure: Remove the rear spoiler assembly. Refer to Rear Spoiler Replacement (ZR1) or Rear Spoiler Replacement (Base Z06) .
1Rear End Spoiler Stud (Qty: 2) CAUTION: Refer to Fastener Caution . Tighten: Hand tighten the two studs back into the rear spoiler assembly after the high mount stop lamp has been positioned into the spoiler pocket.
2High Mount Stop Lamp Assembly Tip: Service the high mount stop lamp as an assembly.
CAUTION
Refer to Fastener Caution .

Scheme 28

Scheme 28: High Mount Stop Lamp Replacement (Z06)
Scheme 28: High Mount Stop Lamp Replacement (Z06)
CalloutComponent Name
Preliminary Procedure Remove both inner tail lamps. Refer to Tail Lamp Replacement . Reach inside the tail lamp holes and remove the four nuts securing the rear spoiler to the rear bumper fascia. Disconnect the electrical connector.
1Rear Spoiler Stud (Qty: 4) Tip: Remove the center two studs in order to separate the CHMSL from the rear spoiler.
2Center High Mounted Stop Lamp (CHMSL) Tip: Remove the two inner studs from the rear spoiler in order to separate the CHMSL from the rear spoiler.
3Rear Spoiler CAUTION: Refer to Fastener Caution . Tighten: 10 N.m (89 lb in)
CAUTION
Refer to Fastener Caution .
  1. Open the rear lift window (coupe), or open the trunk lid.
  2. Remove the cargo lamp assembly from the cargo area corner carpet section. Slide the lamp up out of the carpet panel.
  1. Install the cargo lamp assembly to the cargo area corner carpet section. Snap the lamp into the carpet panel.
  2. Close the rear lift window (coupe), or close the trunk lid.
  1. Open the rear lift window (coupe), or open the trunk lid.
  2. Remove the cargo lamp assembly from the cargo area corner carpet section. Slide the lamp up out of the carpet panel.
  3. Remove the bulb from the cargo lamp.
  1. Install the bulb to the cargo lamp.
  2. Install the cargo lamp assembly to the cargo area corner carpet section. Snap the lamp into the carpet panel.
  3. Close the rear lift window (coupe), or close the trunk lid.

Scheme 29

Scheme 29: Backup Lamp Replacement
Scheme 29: Backup Lamp Replacement
CalloutComponent Name
Preliminary Procedure: Remove the rear fascia extension. Refer to Rear Bumper Fascia Extension Replacement .
1Backup Lamp Screw (Qty: 2) CAUTION: Refer to Fastener Caution . Tighten: 2 N.m (18 lb in)
2Backup Lamp Tip: Twist the bulb socket and pull inward to replace the bulb.
CAUTION
Refer to Fastener Caution .

Scheme 30

Scheme 30: Backup Lamp Bulb Replacement
Scheme 30: Backup Lamp Bulb Replacement
CalloutComponent Name
1Rear Back Up Lamp Bulb Socket
2Rear Back Up Lamp Bulb WARNING: Refer to Halogen Bulb Warning . Procedure Reach under the rear bumper fascia extension. Rotate the bulb socket counterclockwise in order to remove the socket from the lamp assembly. Pull the bulb straight from the bulb socket.
WARNING
Refer to Halogen Bulb Warning .

Scheme 31

Scheme 31: Rear License Plate Lamp Replacement
Scheme 31: Rear License Plate Lamp Replacement
CalloutComponent Name
1Screw (Qty: 4) CAUTION: Refer to Fastener Caution . Tighten: 1.9 N.m (17 lb in)
2Lens Socket Tip: Pull the electrical harness with the lamp cover in order to disconnect the socket from the lamp bulb.
CAUTION
Refer to Fastener Caution .

Scheme 32

Scheme 32: Tail Lamp Replacement
Scheme 32: Tail Lamp Replacement
CalloutComponent Name
1Tail Lamp Assembly Screw (Qty: 2) CAUTION: Refer to Fastener Caution . Tighten: 2 N.m (18 lb in)
2Tail Lamp Assembly Tip: Rotate the top of the lens rearward in order to move the lamp far enough to disconnect the electrical connectors.
CAUTION
Refer to Fastener Caution .

Scheme 33

Scheme 33: Tail Lamp Bulb Replacement
Scheme 33: Tail Lamp Bulb Replacement
CalloutComponent Name
Preliminary Procedure: Remove the rear tail lamp. Refer to Tail Lamp Replacement .
1Rear Lamp Harness Electrical Connector
2Rear Tail Lamp Bulb Tip: Pull the bulb straight from the socket.

Exterior Lamps

The exterior lighting consist of the following lamps

  1. Headlamps
  2. Daytime running lamps (DRL)
  3. Fog lamps
  4. Park, tail, license and marker lamps
  5. Turn signal lamps
  6. Hazard warning lamps
  7. Repeater lamps (export)
  8. Stop lamps
  9. Backup lamps

High Intensity Discharge (HID) Low Beam Headlamps

The headlamps may be turned ON in 2 different ways

  1. When the headlamp switch is placed in the ON position, for normal operation
  2. When the headlamp switch is placed in the AUTO position, for automatic lamp control (ALC)

Battery voltage is applied at all times to the coil and switched side of the low beam relay. Ground is applied at all times from G201 to the turn signal/multifunction switch. When the turn signal/multifunction switch is placed in the HEAD position, ground is applied from the turn signal/multifunction switch through the headlamps ON signal circuit to the body control module (BCM). The BCM applies ground to the headlamp low beam relay control circuit. This energizes the low beam relay, closing the switched side and applies battery voltage to the LEFT and RIGHT LOW BEAM fuses. Battery voltage is then applied from the fuses, through the low beam voltage supply circuits to the ballast in the headlamp assembly. When battery voltage is applied to the headlamp ballast through the low beam voltage supply circuits, the ballast charge the starter to start the lamp. High intensity discharge (HID) headlamps do not have filaments like traditional bulbs, instead the starter uses a high voltage transformer to convert the input voltage into a higher voltage. This increased voltage is used in order to create an arc between the electrodes in the bulb.

Ground is applied from G101 for the left headlamp and G102 for the right headlamp.

High Intensity Discharge (HID) High Beam Headlamps

Battery voltage is applied at all times to the coil and switched side of the high beam relay. Battery voltage is also applied at all times through the coil side of the low beam relay to the low beam relay control circuit, to the turn signal/multifunction switch. When the turn signal/multifunction switch is placed in the high beam position, battery voltage is applied through the headlamp switch high beam signal circuit to the body control module (BCM). The BCM applies ground to the headlamp high beam relay control circuit. This energizes the high beam relay, closing the switched side contacts, applying battery voltage to the Left and Right High Beam Fuses. Battery voltage is then applied from the High Beam Fuses through the high beam voltage supply circuits to the left and right high beam headlamps.

Ground is applied from G101 for the left high beam headlamp and G102 for the right high beam headlamp.

Run Up Of The Lamp

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

When To Change The HID Bulb

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

The following symptoms are noticeable signs of bulb failure

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

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

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

Light Color

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

Automatic Lamp Control/Twilight Sentinel

Place the turn signal/multifunction switch in the OFF position for automatic lamp control. During automatic lamp control the headlamps will be off during daylight conditions but will turn on when the ambient light sensor detects low outside light level. The ambient light sensor is a light sensitive transistor that varies the voltage signal to the HVAC control module. The HVAC control module sends a signal to the body control module (BCM) via class 2 serial data commanding the BCM to apply ground to the headlamp low beam relay control circuit. This energizes the low beam relay, closing the switched side and applies battery voltage to the LEFT and RIGHT LOW BEAM fuses. Battery voltage is applied from the low beam fuses, through the low beam voltage supply circuits to the ballast in the headlamp assembly. When battery voltage is applied to the headlamp ballast through the low beam voltage supply circuits, the ballast will then charge the starter to start the lamp. High intensity discharge (HID) headlamps do not have filaments like traditional bulbs, instead the starter uses a high voltage transformer to convert the input voltage into a higher voltage. This increased voltage is used in order to create an arc between the electrodes in the bulb. The ground for the headlamps is supplied from G101 for the left headlamp and G102 for the right headlamp.

Flash to Pass (FTP)

When the low beam headlamps are on and the turn signal/multifunction switch is momentarily placed in the flash to pass (FTP) position, ground is applied from G201 to the turn signal/multifunction switch. The turn signal/multifunction switch applies ground to the body control module (BCM) through the FTP switch signal circuit. The BCM then applies ground to the high beam relay control circuit. This energizes the high beam relay, closing the switched side of the high beam relay, applying battery voltage to the LEFT and RIGHT HIGH BEAM fuses. Battery voltage is applied from the High Beam fuses through the high beam solenoid switched voltage supply circuit to the high beam solenoid assembly inside of the headlamp. This causes the solenoid to retract a plate partially covering the low beam headlamps and allowing the lamps to illuminate at full brightness momentarily.

Daytime Running Lamps (DRL)

The daytime running lamps (DRL) will illuminate the right and left front turn signal bulbs continuously. The DRLs will operate when the following conditions are met

  1. The ignition is in the RUN or CRANK position
  2. The shift lever is out of the PARK position for vehicles equipped with automatic transmissions or the parking brake is released for vehicles with manual transmissions.
  3. The high and low beam headlamps are OFF.

The ambient light sensor is used to monitor outside lighting conditions. The ambient light sensor provides a voltage signal that will vary between .2 and 4.9 volts depending on outside lighting conditions. The HVAC control module provides a low reference ground and a 5-volt reference signal to the ambient light sensor. The HVAC control module monitors the ambient light sensor signal circuit to determine if outside lighting conditions are correct for either daytime running lights (DRL) or automatic lamp control (ALC) when the headlamp switch is in the AUTO position. The HVAC control module sends a signal to the body control module (BCM) via class 2 serial data commanding the BCM to turn the front turn lamps on steady (non-flashing). Any function or condition that turns on the headlamps will cancel the DRL operation. With the turn signal/multifunction switch in the OFF position, the turn signal lamps will either be turned ON or OFF after a 30-second delay, depending on whether daylight or low light conditions are sensed by the ambient light sensor.

Front Fog Lamps

Ground is applied at all times at G201 to the front fog lamp switch inside of the turn signal/multifunction switch. When the front fog lamp switch is placed in the ON position, ground is applied through the front fog lamp switch signal circuit to the body control module (BCM). The BCM applies battery voltage through the front fog lamp relay control circuit to the coil side of the fog lamp relay. Battery voltage is applied at all times from the FRT FOG LP fuse to the switch side of the FRT FOG LP relay. When the relay is energized, the relay switch contacts close and battery voltage is applied from the FRT FOG LP fuse, through the relay switch contacts, to the front fog lamps. Ground for the front fog lamps is applied at all times at G101 for the left fog lamp and G102 for the right fog lamp. G102 also serves as ground for the coil side of the FRT FOG LP relay.

The BCM will send a message via class 2 serial data to the instrument panel cluster (IPC) to enable the front fog lamp indicator. The front fog lamps will deactivate when either the flash-to-pass or the high beam headlamps are turned ON.

Rear Fog Lamps

Ground is applied at all times at G201 to the rear fog lamp switch inside of the turn signal/multifunction switch. When the rear fog lamp switch is placed in the ON position, ground is applied through the rear fog lamp switch signal circuit to the body control module (BCM). Battery voltage is applied at all times from the REAR FOG/ALDL TOP SW fuse to the BCM. The BCM applies ground through the rear fog lamp relay control circuit to the coil side of the REAR/FOG Relay causing the relay to energize. When the relay is energized, the switch contacts close and battery voltage is applied from the RR FOG/ALDL TOP SW fuse, through the relay, to the rear fog lamps. Ground for the rear fog lamps is applied at all times at G302.

The BCM will send a message via class 2 serial data to the instrument panel cluster (IPC) to enable the rear fog lamp indicator.

Park, Tail, License and Marker Lamps

Battery voltage is applied at all times from the PK LAMPS fuse to both coil and switched sides of the PARK LAMP Relay located in the underhood fuse block. Ground is applied at G201 to the turn signal/multifunction switch at all times. When the headlamp switch is place in either the HEAD or PARK position, ground is applied to the park lamp relay control circuit. This energizes the PARK LAMP Relay and applies battery voltage to all park, tail, license, and marker lamps. Ground for the front park and marker lamps is supplied at G101 for the left and G102 for the right. Ground for the license, tail, and rear side marker lamps is supplied at G302.

Turn Signal Lamps

Ground is applied at all times at G201 to the turn signal/multifunction switch. The turn signal lamps may only be activated with the ignition switch in the ON or START position. When the turn signal/multifunction switch is placed in either the TURN RIGHT or TURN LEFT position, ground is applied to the body control module (BCM) through either the right turn or left turn signal switch circuit. Battery voltage is applied at all times from the BATT MAIN 3 fuse to the BCM. The BCM then applies a pulsating voltage to the front and rear turn signal lamps. Ground for the left front turn signal lamp is supplied at G101. Ground for the right front turn signal lamp is supplied at G102. The left and right rear turn signal lamps are supplied ground at G302.

Hazard Flasher Lamps

The hazard flashers may be activated in any power mode. The hazard switch is permanently grounded through G201. When the hazard switch is placed in the ON position, ground is applied through the hazard switch signal circuit to the body control module (BCM). The BCM supplies battery voltage to all four turn signal lamps in an ON and OFF duty cycle. When the hazard switch is placed in the ON position, the instrument panel cluster (IPC) receives a signal from the hazard switch and applies voltage through the hazard flash indicator circuit to the hazard switch to illuminate the hazard indicator.

Stop Lamps

The brake pedal position sensor is used to sense the action of the driver application of the brake pedal. The brake pedal position sensor provides an analog voltage signal that will increase as the brake pedal is applied. The body control module (BCM) provides a low reference signal and a 5-volt reference voltage to the brake pedal position sensor. When the variable signal reaches a voltage threshold indicating the brakes have been applied, the BCM will apply battery positive voltage to the stop lamps, transmission control module (TCM), engine control module (ECM), and stop lamp relay coil side. The BCM also supplies the stop lamp relay coil with ground. When the stop lamp relay receives battery voltage and ground from the BCM, the relay coil is energized and the stop lamp relay switch contacts close applying battery voltage through the STOP/B/U/LPS fuse to illuminate the center high mounted stop lamp (CHMSL). Ground for the stop lamps and CHMSL is applied at G302. The stop lamps on this vehicle will not illuminate unless the ignition is in the accessory, run, or crank positions. When the ignition is in the OFF position the stop lamps will not illuminate when the brake pedal is applied.

Repeater Lamps (export)

The repeater lamps are located on the side of the front fender. The repeater lamps are used as additional turn signal lamps, and operate as described in the Turn Signal Lamps description. The repeater lamps are hard wired to there respective front turn signals and receive ground at G101 for the left front repeater lamp and ground G102 for the right front repeater lamp.

Automatic Transmission

The underhood fuse block supplies battery voltage through the STOP/B/U/LPS fuse to the coil and switch terminals of the BCK/UP LAMP Relay located in the body control module (BCM). When the transmission is placed in the REVERSE position, the transmission control module (TCM) sends a class 2 message to the BCM. The message indicates that the gear selector is in the REVERSE position. The BCM grounds the back up lamp relay control circuit of the reverse lamp relay. This energizes the reverse lamp relay, closing the switch side contacts and provides battery voltage to the REVERSE LAMPS fuse through to the backup lamps. The backup lamps are permanently grounded at G302. With both power and ground the backup lamps illuminate. Once the driver moves the gear selector out of the REVERSE position, a message is sent by the TCM via class 2 serial data requesting the BCM to remove ground from the REVERSE LAMP Relay control circuit. This opens the REVERSE LAMP Relay switch contacts turning OFF the backup lamps.

Manual Transmission

The underhood fuse block supplies battery voltage through the STOP/B/U/LPS fuse to the coil and switch terminals of the BCK/UP LAMP Relay located in the body control module (BCM). The BCM provides the normally open reverse switch with voltage. When the transmission is placed in the reverse position the reverse switch closes providing a ground path through the reverse lamp relay control circuit to the BCM. The BCM then grounds the back up lamp relay control circuit of the reverse lamp relay. This energizes the reverse lamp relay, closing the switch side contacts and provides battery voltage to the REVERSE LAMPS fuse through to the backup lamps. The backup lamps are permanently grounded at G302. Once the driver moves the gear selector out of the REVERSE position, the reverse switch opens and the BCM removes ground from the REVERSE LAMP Relay control circuit. This opens the REVERSE LAMP Relay switch contacts turning OFF the backup lamps.

Interior Lamps

The interior lamps consist of 2 groups. The first group are those lamps which may not be dimmed. The 2nd group include lamps that may be dimmed.

  1. Courtesy/illuminated entry lamps
  2. Inside rearview mirror lamps
  3. Instrument panel (I/P) compartment lamps
  4. Underhood lamp
  5. Vanity mirror lamps

Courtesy Lamps

The courtesy lamps include the instrument panel courtesy (IPC) lamps, the exterior courtesy lamps, and the rearview mirror lamps. Turn the courtesy lamps ON manually by placing the interior lamp switch in the DOME position, by opening a door or opening the trunk. After all doors have been closed the courtesy lamps will remain illuminated approximately 15 seconds after the last door closes. Courtesy lamps also turn ON prior to any door being opened, and remain illuminated approximately 30 seconds after the driver removes the ignition key.

The CTSY/LAMP fuse supplies battery voltage to the body control module (BCM). The BCM applies battery voltage to the courtesy lamps through the courtesy lamp supply voltage circuit. When any door is opened, the jam switch contacts close and the BCM receives a door-open input. If the BCM receives a door lock or unlock input or a rear hatch open input, the BCM will activate the courtesy lamp supply voltage circuit, providing battery voltage to all of the instrument panel (I/P) courtesy lamps and the rearview mirror lamps. The BCM also provides a class 2 serial data message to the driver door module (DDM) and passenger door module (PDM) to apply battery voltage to the exterior courtesy lamps.

The courtesy lamps will normally turn OFF using the theater dimming feature. The BCM provides a pulse width modulated ground to the courtesy/reading and inside rearview mirror lamps for the theater dimming feature. The BCM turns OFF the courtesy lamps if a door lock command is received after all of the doors are closed, or if the ignition switch is turned to either the ON or RUN position.

The BCM will provide interior lamp illumination in the event that an air bag has been deployed. Upon deployment of the air bag the inflatable restraint sensing and diagnostic module (SDM) will send a class 2 serial data message to the BCM. The BCM will activate the interior lamps approximately 15 seconds after air bag deployment if the Photocell Status is Dark and the ignition is in the ON position. The interior lamps will remain illuminated until there is a change in the power mode.

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 for 15 seconds after the door is closed. The BCM will turn off the courtesy lamps 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 (RFA) transmitter to unlock the doors, release the rear hatch, or press the panic button, the BCM will keep the courtesy lamps ON for 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 turn OFF immediately. The BCM keeps the courtesy lamps on for 40 seconds after an alarm event is completed.

Vanity Lamps

The CTSY/LAMP fuse supplies battery voltage to the body control module (BCM). The BCM applies battery voltage to the vanity lamps through the courtesy lamp supply voltage circuit. When a vanity mirror cover on one of the sunshades is opened, its switch closes providing a ground circuit, and the vanity lamp illuminates.

I/P Compartment Lamp

The CTSY/LAMP fuse supplies battery voltage to the body control module (BCM). The BCM applies battery voltage to the instrument panel (I/P) compartment lamp through the courtesy lamp supply voltage circuit. When the I/P compartment is opened, its switch closes providing a ground circuit, and the I/P compartment lamp illuminates.

Underhood Lamp

The CTSY/LAMP fuse supplies battery voltage to the body control module (BCM). The BCM applies battery voltage to the underhood lamp through the courtesy lamp supply voltage circuit. When the hood is opened, its switch closes providing a ground circuit, and the underhood lamp illuminates.

Interior Lamps Dimming

Interior lamps dimming are lamps that may be dimmed by operating the instrument panel (I/P) dimmer switch. This group consist of the following lamps

  1. Hazard switch
  2. Door switches and the window switches
  3. Steering wheel controls
  4. HVAC control head assembly
  5. Ignition switch
  6. Radio
  7. Rear compartment/fuel door release switch
  8. Traction/suspension control switch
  9. Power seat switch
  10. PRNDL
  11. Power folding top switch
  12. Fog lamp switch
  13. Front and rear fog lamp switch (Export)

When the ignition switch is turned ON, the vacuum fluorescent (VF) displays, for the radio and HVAC control assembly, the incandescent lamps and the pulse width modulation (PWM) lamps turn ON at maximum brightness. When the park lamps are ON and the ambient light sensor indicates low light conditions, all back lighting turn ON at the dimming level indicated by the I/P dimmer switch. At the same time all VF displays dim in order to match the indicated dimming level. When the headlamp switch is placed in the PARK position, the body control module (BCM) energizes the park lamp relay coil control circuit and dims the interior lamps to the dimming level indicated by the I/P dimmer switch. When the driver selects a dimming setting by moving the I/P dimming switch potentiometer, all back lighting lamps are provided with a specific voltage. When the I/P dimmer switch is moved from MIN to MAX, all VF displays and all back lighting respond from minimum intensity to maximum brightness in response to the I/P dimmer switch.

The driver may select parade mode by manually turning on the park lamps during daylight conditions.

Driver Controls and Modules

Driver controls include the following components

  1. Emergency flasher switch
  2. Fog lamp switch
  3. Headlamp dimmer switch
  4. Headlamp switch
  5. Interior lamp switch
  6. Instrument panel (I/P) dimmer switch
  7. Stop lamp switch
  8. Turn signal switch

Three modules process the inputs and the controls. The ambient light sensor supplies the body control module (BCM) with a signal for daytime conditions and for low light conditions.

  1. Ambient light sensor
  2. BCM
  3. Instrument panel cluster (IPC)

Battery Rundown Protection/Inadvertent Power

To provide battery run down protection, the interior lamps will be deactivated automatically under certain conditions. The body control module (BCM) initiates a 10 minute timer if the interior lamp relay control output is still active, and the ignition switch is in the OFF position. At the end of the designated time, the BCM will deactivate the interior lamp relay, disabling the interior lamps. This feature will be cancelled if any power mode other than OFF becomes active. The BCM will reset the timer if any interior lamp switch is turned ON, a door is opened, or the remote control door lock receiver (RCDLR) module is activated.

See also:
• Diagnostic System Check - Vehicle
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• Component Connector End Views
• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
• Control Module References
• Diagnostic Repair Verification
• Inside Rearview Mirror Replacement (DD8)
• Sunshade Replacement
• Relay Replacement (Attached to Wire Harness)
• Sun Load Temperature Sensor Replacement
• Checking Aftermarket Accessories
• Backup Lamp Switch Replacement
• Door Lock Replacement
• Rear Compartment Lift Window Latch Replacement
• Symptoms - Hydraulic Brakes
• Turn Signal Multifunction Switch Replacement
• Head Up Display Switch Replacement
• Folding Top Switch Replacement
• Instrument Panel Insulator Panel Replacement
• Fastener Caution
• Defroster Grille Replacement
• Lifting and Jacking the Vehicle
• Front Wheelhouse Liner Replacement (Front Liner)
• Front Bumper Fascia Replacement
• Tire and Wheel Removal and Installation
• Halogen Bulb Warning
• Rear Compartment Floor Panel Carpet Replacement (Convertible)
• Rear Spoiler Replacement (ZR1)
• DTC B1480
• Brake Pedal Position Sensor Calibration
• Brake Pedal Position Sensor Replacement
• Front Fog Lamps Malfunction
• Rear Fog Lamps Malfunction
• Hazard Lamps Malfunction
• Interior Backlighting Malfunction
• Park, License, and/or Tail Lamps Malfunction
• Stop Lamps Malfunction
• Dome Lamp Switch Malfunction
• Door Open Switch Malfunction
• Front Fog Lamp Switch Malfunction
• Rear Fog Lamp Switch Malfunction
• Headlamp Switch Malfunction
• Dimmer Switch Malfunction
• Park Lamp Switch Malfunction
• Turn Signal Switch Malfunction
• Turn Signal Lamps Malfunction
• Fastener Tightening Specifications