Initial Inspection and Diagnostic Overview

1. Verify the customer concern by operating the interior lighting system.
2. Visually inspect for obvious signs of mechanical and electrical damage.

NOTE: The LCM must be reconfigured upon replacement. Refer to the diagnostic tool help screen on the configuration card to program the LCM.

Visual Inspection Chart:

3. 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 connections to the vehicle.
^ check the ignition switch position.

4. If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool manual.
5. Carry out the DATA LINK DIAGNOSTICS TEST. Pinpoint Test PC (Precheck)
If the diagnostic tool responds with:
^ CKT914, CKT915 or CKT70 = ALL ECUS NO RESP/NOT EQUIP, refer to Module Communications Network (Information Bus).
^ NO RESP/NOT EQUIP for Lighting Control Module (LCM), go to Pinpoint Test A. Test A: No Communication With the Module - LCM
^ NO RESP/NOT EQUIP for Driver Door Module (DDM), go to Pinpoint Test B. Test B: No Communication With The Module - Unable To Perform On-Demand Self-On Driver Door Module
^ 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.

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