Initial Inspection and Diagnostic Overview

1. Verify the customer's concern by operating the warning chime system to duplicate the condition.
2. Inspect to determine if one of the following electrical concerns apply:

VISUAL INSPECTION CHART

Electrical
- Check fuse junction panel Fuses 4 (15 A), 8 (15 A). 13 (15 A), 6 (15 A).
- Check electrical connections for obvious damage, shorts or opens.

3. If the inspection reveals obvious concerns that can be readily serviced, correct the concern before continuing with Inspection and Verification.
4. If the concern remains after the inspection, connect the Rotunda New Generation Star (NGS) Tester 007-00500 or equivalent to the data link connector (DLC) located beneath the instrument panel to perform DATA LINK DIAGNOSTICS test. If the NGS responds with NO RESPONSE/NOT EQUIPPED for the lighting control module, go to Pinpoint Test A. A: No Communication With Lighting Control Module
If the DATA LINK DIAGNOSTICS test is passed for the lighting control module, retrieve continuous Diagnostic Trouble Codes (DTCs) and execute Self Test Diagnostics for the lighting control module to retrieve current DTCs.
5. If self test is passed and no DTCs are retrieved, go to Symptom Chart to continue diagnostics. Symptom Related Diagnostic Procedures
6. If DTCs are retrieved, go to Lighting Control Module Diagnostic Trouble Codes (DTC) Index to continue diagnostics. Diagnostic Trouble Code Tests and Associated Procedures
7. If the lighting control module cannot be accessed by the NGS, go to Pinpoint Test A. A: No Communication With Lighting Control Module

Rotunda Service Bay Diagnostic System (SBDS (R)) 001-00001 may also be used to diagnose this system.