Flow of Diagnosis

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

VISUAL INSPECTION CHART

Mechanical
- Binding Latch or Lock Mechanisms

Electrical
- Open power distribution box Fuse 28 (30A)
- Open fuse junction panel Fuse 41 (10A)
- Loose connectors
- Corroded connectors

3. If the inspection reveals obvious concerns that can be readily identified, service as required.
4. If the concern remains after inspection, connect the Rotunda New Generation Star (NGS) Tester to the Data Link Connector (DLC) located beneath the instrument panel to perform DATA LINK DIAGNOSTIC TEST. If the NGS responds with NO RESPONSE/NOT EQUIPPED for the driver door module, go to Pinpoint Test A. Test A : No Communication With Driver Door Module
If the NGS responds with NO RESPONSE/NOT EQUIPPED for the steering column/ignition/lighting control module, go to Pinpoint Test B. Test B : No Communication With (SCIL) Control Module
If the DATA LINK DIAGNOSTIC TEST is passed for the driver door module and the steering column/ignition/lighting control module, retrieve continuous Diagnostic Trouble Codes (DTCs) and execute Self Test Diagnostics for the driver door module and steering column/ignition/lighting control module.
5. If the self test is passed and no diagnostic trouble codes 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 (DDM) Diagnostic Trouble Code (DTC) Index to continue diagnostics. Driver Door Module (DDM) Diagnostic Trouble Code (DTC) Index
If DTCs are retrieved for the steering column/ignition/lighting control module, go to the Steering Column/Ignition/Lighting (SCIL) Control Module Diagnostic Trouble Code Index to continue diagnostics. Steering Column/Ignition/Lighting (SCIL) Module DTC Index
7. If the driver door module cannot be accessed by the NGS tester, go to Pinpoint Test A. Test A : No Communication With Driver Door Module
If the steering column/ignition/lighting control module cannot be accessed by the NGS, go to Pinpoint Test B. Test B : No Communication With (SCIL) Control Module