Flow of Diagnosis

1. Verify the customer's concern by operating the electronic door lock control system to duplicate the condition.
2. Inspect to determine if one of the following mechanical or electrical concerns apply:

VISUAL INSPECTION CHART

Mechanical
- Binding Latches

Electrical
- Open Fuses:
- Power Distribution Box Fuse 9 (40 A), Fuse 13 (30 A) (Maxi)
- Fuse Junction Panel Fuse4 (10 A), Fuse 5 (10 A), Fuse 8 (30 A), Fuse 39 (10 A), Fuse 41 (20 A)
- Loose connectors
- Corroded Connectors

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 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 driver door module, go to Pinpoint Test A. A: No Communication With Driver Door Module (DDM)

If the NGS responds with NO RESPONSE/NOT EQUIPPED for the lighting control module, go to Pinpoint Test B. B: No Communication With Lighting Control Module
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 driver door module, go to the Driver Door Module Diagnostic (DDM) Diagnostic Trouble Code (DTC) Index to continue diagnostics. Driver Door Module (DDM) Diagnostic Trouble Code (DTC) Index

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
7. If the driver door module cannot be accessed by the NGS tester, go to Pinpoint Test A. A: No Communication With Driver Door Module (DDM)

If the lighting control module cannot be accessed by the NGS tester, go to Pinpoint Test B. B: No Communication With Lighting Control Module

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