Flow of Diagnosis

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

VISUAL INSPECTION CHART

Electrical
- Open fuse junction panel Fuse:
- 1 (10A), 31 (15A), 39 (10A), 41 (20A)
- Power distribution box:
- Fuse 9 (40A)
- Open bulbs
- Loose connectors
- Corroded connectors
- Damaged lamps
- Damaged switches
- Stuck switches

3. If inspection reveals an obvious concern that is 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 the Data Link Diagnostics Test. If the NGS responds with NO RESPONSE/NOT EQUIPPED for the lighting control module, go to Pinpoint Test BA. BA No Communication With Lighting Control Module

If the NGS responds with NO RESPONSE/NOT EQUIPPED for the driver door module, go to Pinpoint Test BB. BB No Communication With Driver Door Module

If the Data Link Diagnostic test is passed for the lighting control module and driver door module, retrieve continuous DTCs and execute self test diagnostics for the suspect module(s).
5. If self test is passed and no DTCs are retrieved, GO to the Symptom Chart to continue diagnostics. Symptom Related Diagnostic Procedures
6. If DTCs are retrieved for the lighting control module, go to the Lighting Control Module (LCM) Diagnostic Trouble Code (DTC) Index to continue diagnostics. Lighting Control Module (LCM) DTC Index

If DTCs are retrieved for the driver door module, go to the Driver Door Module (DDM) Diagnostic Trouble Code (DTC) Index to continue diagnostics. DDM Diagnostic Trouble Code (DTC) Index
7. If the lighting control module cannot be accessed by the NGS tester, go to Pinpoint Test BA. BA No Communication With Lighting Control Module

If the driver door module cannot be accessed by the NGS tester, go to Pinpoint Test BB. BB No Communication With Driver Door Module

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