Initial Inspection and Diagnostic Overview

Special Tool(s)

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





Visual Inspection Chart

3. If inspection reveals an obvious concern that is readily repaired, correct the concern before continuing with inspection and verification.
4. If the concern remains after inspection, connect the diagnostic tool to the data link connector (DLC) located beneath the instrument panel to carry out DATA LINK DIAGNOSTICS (DTC) test. If the diagnostic tool responds with NO RESPONSE NOT EQUIPPED for the lighting control module (LCM), refer to Accessories and Optional Equipment. If the DATA LINK DIAGNOSTICS test is passed for the LCM, retrieve continuous DTC's and execute self-test diagnostics for the LCM to retrieve current DTC's.
5. If the self-test is passed and no DTC's are retrieved, go to the Symptom Chart to continue diagnostics. [1][2]Diagnostic Trouble Code Descriptions

6. If DTC's are retrieved, go to the Lighting Control Module (LCM) Diagnostic Trouble Code (DTC) Index to continue diagnostics.
7. If the LCM cannot be accessed by the diagnostic tool, refer to Accessories and Optional Equipment.

NOTE: For a complete list of lighting control module (LCM) DTC's,, refer to Accessories and Optional Equipment.