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Home >> Lincoln >> 1997 >> Town Car V8-4.6L VIN W >> Repair and Diagnosis >> Lighting and Horns >> Testing and Inspection >> Flow of Diagnosis

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 mechanical or electrical concerns apply:

VISUAL INSPECTION CHART

Mechanical
^ Damaged outside door handles.

Electrical
^ Fuse 8 (15 A) and circuit breaker 14 (20 A) open.
^ Circuitry open/shorted.
^ Damaged driver door module.

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(s) remains after the inspection, use Rotunda New Generation (NGS) Tester 007-00500, connected to the Data Link Connector (DLC) to retrieve continuous Diagnostic Trouble Codes (DTCs) and to execute Self Test Diagnostics for the lighting control module and driver door module, go to Information Bus. 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
5. If self test is passed and no DTCs are retrieved, go to Symptom Chart to continue diagnosis. 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 Diagnostic Trouble Code (DTC) Index

If DTCs are retrieved for the driver door module, go to the Driver Door Module (DDM) DTC Index to continue diagnostics. Driver Door Module (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, go to Pinpoint Test BB. BB No Communication With Driver Door Module

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