Interior Lighting

1. Verify the customer concern by operating the interior lighting system.

NOTE: The lighting control module (LCM) must be reconfigured upon replacement.

2. Visually inspect for the following obvious signs of mechanical and electrical damage.

VISUAL INSPECTION CHART

Mechanical
^ Switches

Electrical
^ Fuse
^ LCM
^ Driver Door Module (DDM)
^ Circuitry
^ Damaged or corroded connectors
^ Damaged bulb

3. If the concern remains after the inspection connect the New Generation STAR (NGS) Tester to the data link connector located beneath the instrument panel and select the vehicle to be tested from NGS menu. If the NGS does not communicate with the vehicle:
^ check that the program card is properly installed.
^ check the connections to the vehicle.
^ check the ignition switch position.

4. If the NGS still does not communicate with the vehicle, refer to the New Generation STAR Tester manual.
5. Perform the DATA LINK DIAGNOSTIC TEST. If the NGS responds with:
^ CKT 914, CKT 915 or CKT 7O ALLECUS NO RESP/NOT EQUIP, refer to Information Bus.
^ NO RESP/NOT EQUIP for LCM, go to Pinpoint Test A. A No Comm W/LCM Module-Unable to Perform ON-Demand Self Test
^ NO RESP/NOT EQUIP for DDM, go to Pinpoint Test B. B No Comm W/DDM Module-Unable to Perform ON-Demand Self Test
^ SYSTEM PASSED, retrieve and record the continuous Diagnostic Trouble Codes (DTCs), erase the continuous DTCs and perform self test diagnostics for the LCM and DDM modules.

6. If the DTCs retrieved are related to the concern, go to LCM DTC Index LCM Diagnostic Trouble Code Index
or DDM DTC Index to continue diagnostics. DDM Diagnostic Trouble Code Index
7. If no DTCs related to the concern are retrieved, proceed to Symptom Chart to continue diagnostics. Interior Lighting