Flow of Diagnosis

1. Verify the customer's concern by operating the power windows/heated back window to duplicate the condition.
2. Inspect to determine if one of the mechanical or electrical concerns apply:

Mechanical
- Front door power window regulator damaged.
- Front window run damaged.
- Front door window glass out of window run.
- Front door window glass broken.

Electrical
- Circuits open/shorted.
- Lighting control module.
- Driver door module.
- Loose, corroded connectors.
- Damaged window regulator control switch.
- Damaged window regulator electric drive.
- Open fuse junction panel Fuse 14 (20 A circuit breaker), 13 (5 A), 6 (15 A), 17 (10 A).
- Open circuit breaker in fuse junction panel door lock/seat motors 20 A circuit breaker.
- In-line circuit breaker.
- Scratched grid.
- Open fuse in power distribution box, HTD BLT (40 A).
- Heated back window relay.

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 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

- 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

- If the Data Link Diagnostics test is passed for the driver door module and lighting control module, retrieve continuous DTCs and execute self test diagnostics for the driver door module and lighting control module to retrieve current DTCs.

5. If self test is passed and no DTCs are retrieved, go to 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 Diagnostic Trouble Code Index

If DTCs are retrieved for the lighting control module, go to the Lighting Control Module (LCM) DTC Index to continue diagnostics. LCM Diagnostic Trouble Code 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

If the lighting control module cannot be accessed by the NGS, 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.