Interior Accent Lighting Malfunction
Interior Accent Lighting Malfunction
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructionsprovides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
The instrument panel (I/P) dimmer switch is used to increase and decrease the brightness of the interior backlighting components. The I/P dimmer switch provides a voltage signal that will increase as the brightness of the light are increased and decrease as the brightness of the lights are decreased. The body control module (BCM) provides a low reference signal and a B+ voltage reference to the I/P dimmer switch. When the I/P dimmer switch is placed in the desired position, the dimmed voltage setting is applied from the I/P dimmer switch through the I/P dimmer switch signal circuit to the BCM. The BCM interprets the signal and applies the dimmed voltage to the individual accent lamps via the accent lamps control circuit. The BCM also sends a serial data message to the driver and front passenger door control modules requesting the accent lamps on both doors be dimmed to the requested level. The driver and front passenger door modules respond by applying the appropriate voltage for the requested dim level to the accent lights.
Reference Information
Schematic Reference
Interior Lights Dimming Schematics Interior Lights Dimming Schematics
Connector End View Reference
Component Connector End Views Connector Views
Description and Operation
Interior Lighting Systems Description and Operation Interior Lighting Systems
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Control Module Referencesfor scan tool information
Circuit/System Verification
1. Ignition ON, observe the scan tool Dimming Control Signal parameter while operating the dimmer switch from high to low. The reading should change from a high percent to a low percent as the switch is activated.
• If the reading does not change, refer to Interior Backlighting Malfunction Interior Backlighting Malfunction.
2. Park lamps ON, observe the dimming accent lamps. The intensity of the accent lamps should change as the dimmer switch is operated.
• If the intensity of the dimming accent lamps does not change as the dimmer switch is operated, refer to Accent Lamps Malfunction.
3. Observe the accent lamps located on the front driver and passenger doors. The intensity of the front door accent lamps should change as the dimmer switch is operated.
• If the intensity of the driver or front passenger door accent lamps does not change as the dimmer switch is operated, refer to Accent Lamps Malfunction - Front Doors.
Circuit/System Testing
Accent Lamps Malfunction
1. Ignition OFF, disconnect the harness connector at the appropriate accent lamp.
2. Ignition OFF, test for less than 5.0 ohm between the ground circuit terminal A and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition OFF, park lamps OFF, verify that a test lamp does not illuminate between the control circuit terminal B and ground.
• If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
4. Ignition ON, park lamps ON, verify that a test lamp illuminates between the control circuit terminal B 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 accent lamp.
Accent Lamps Malfunction - Front Doors
1. Ignition OFF, disconnect the harness connector at the front door accent lamp.
2. Ignition OFF, verify that a test lamp illuminates between B+ and the ground circuit terminal A.
• If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
3. Ignition OFF, park lamps OFF, verify that a test lamp does not illuminate between the control circuit terminal B and ground.
• If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the door control module.
4. Ignition ON, park lamps ON, verify that a test lamp illuminates between the control circuit terminal B 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 appropriate door control module.
5. If all circuits test normal, replace the front door accent lamp.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Luminescent Lamp Replacement - Driver or Passenger Seat Luminescent Lamp Replacement - Driver or Passenger Seat
* Front Side Door Warning Lamp Replacement Service and Repair
* Instrument Panel Flood Lamp Replacement - Left Side Instrument Panel Flood Lamp Replacement - Left Side
* Instrument Panel Flood Lamp Replacement - Right Side Instrument Panel Flood Lamp Replacement - Right Side
* Control Module References Control Module Referencesfor BCM, DDM, or PDM replacement, setup, and programming