Initial Inspection - Instrument Panel Illumination

INSPECTION AND VERIFICATION

1. Verify the customer concern.
2. Visually inspect for obvious signs of mechanical or electrical damage.

VISUAL INSPECTION CHART

Electrical
- Headlamp switch
- Central junction box (CJB) fuse(s)
- Connector(s)
- Circuit(s)
- Illumination bulb(s)
- Climate control unit
- Hazard switch
- Headlamp switch
- Dimmer switch (part of the headlamp switch)
- Instrument cluster

3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
4. If the concern remains after the inspection connect the diagnostic tool to the data link connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle:
- check that the program card is correctly installed.
- check the connectors to the vehicle.
- check the ignition switch position.

5. If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool operating manual.
6. Carry out the diagnostic tool data link test. If the diagnostic tool responds with:
- SCP, CAN or ISO circuit fault; all electronic control units no response/not equipped, refer to Information Bus (Module Communications Network).
- No response/not equipped for GEM, refer to Body Control Systems (Multifunction Electronic Control Module).
- System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and carry out self-test diagnostics for the GEM.

7. If the DTCs retrieved are related to the concern, go to Body Control Systems (Multifunction Electronic Control Module) for the Generic Electronic Module (GEM) Diagnostic Trouble Code (DTC) Index. Diagnostic Trouble Code Descriptions
8. If no DTCs related to the concern are retrieved, GO to Symptom Chart. Diagnosis By Symptom - Instrument Panel Illumination