Flow of Diagnosis

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

VISUAL INSPECTION CHART

Electrical
^ Lamps.
^ Switches.
^ Switches.
^ Open fuses.
^ Fuse junction panel:
^ 22 (5 A).
^ 27 (10 A).
^ 23 (5 A).
^ 20 (5 A).
^ 8 (5 A).
^ 12 (5 A).
^ Open bulbs.
^ Loose connectors.
^ Corroded connectors.

3. If the inspection reveals an obvious concern that is readily repaired, correct the concern before continuing with Inspection and Verification.
4. If a concern remains after the inspection, connect Rotunda New Generation Star (NGS) tester 418-F048 (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 Generic Electronic Module (GEM), GO to Pinpoint Test A. A Courtesy Lamps Inoperative If the Data Link Diagnostic test is passed for the Generic Electronic Module (GEM), retrieve continuous DTCs and execute self test diagnostics for the GEM.
5. If self test is passed and no DTCs are retrieved, Symptom Related Diagnostic Procedures continue diagnostics.
6. If DTCs are retrieved, go to the Generic Electronic Module (GEM) Diagnostic Trouble Code (DTC) Index GEM Diagnostic Trouble Code Indexto continue diagnostics.

Rotunda Service Bay Diagnostic System (SBDS(R)) 418-F001 (001-00001) may also be used to diagnose this system.