Initial Inspection and Diagnostic Overview

1. Verify the customer's concern by operating the ignition switch and multi-function switch.





2. Visually inspect for obvious signs of mechanical and electrical damage.
3. If inspection reveals an obvious concern that is readily identified, repair the concern before continuing with Inspection and Verification.
4. If the concern remains after inspection, connect the scan tool to the data link connector located beneath the instrument panel to perform Data Link Diagnostics Test. If the scan tool responds with NO RESPONSE/NOT EQUIPPED for the Lighting Control Module (LCM), go to Pinpoint Test A. If the Data Link Diagnostics Test is passed for the LCM module, retrieve continuous DTCs and execute Self-Test Diagnostics for the LCM module to retrieve current DTCs.
5. If the self-test is passed and no Diagnostic Trouble Codes (DTCs) are retrieved, go to Symptom Chart to continue diagnostics.
6. If the LCM cannot be accessed by the scan tool, go to Pinpoint Test A.

Service Bay Diagnostic System (SBDS) may also be used to diagnose this system.