Diagnosis And Testing - Sunroof: Notes
Before beginning sunroof diagnostics verify that all other power accessories are in proper operating condition. Refer to SUNROOF DIAGNOSIS CHART for possible causes. If not, a common electrical problem may exist. Refer to the SYSTEM WIRING DIAGRAMS article, for circuit, splice and component descriptions. Check the condition of the circuit protection (20 amp circuit breaker in cavity 19 of the Junction Block). Inspect all wiring connector pins for proper engagement and continuity. Check for battery voltage at the power sunroof controller, refer to SYSTEM WIRING DIAGRAMS , for circuit information. If battery voltage of more than 10 volts is detected at the controller, proceed with the following tests (the controller will not operate at less than 10 volts).
Before beginning diagnosis for wind noise or water leaks, verify that the problem was not caused by releasing the control switch before the sunroof was fully closed. The sunroof module has a water-management system. If however, the sunroof glass is in a partial closed position, high pressure water may be forced beyond the water management system boundaries and onto the headlining.
| SYMPTOM | POSSIBLE CAUSE |
|---|---|
| Sunroof motor inoperative. | Faulty control switch. |
| Faulty circuit ground between sunroof electronics module, control switch, and body harness. | |
| Faulty power circuit between sunroof electronics module, control switch, and body harness. | |
| Faulty sunroof drive motor. | |
| Faulty sunroof electronics module. | |
| Faulty sunroof drive motor or electronics module. | |
| Audible whine when switch is depressed, sunroof does not operate. | Faulty sunroof drive motor. |
| Binding cable. | |
| Audible clicking or ratcheting when switch is pressed, sunroof does not operate. | Broken or worn drive cable. |
| Worn drive motor gear. | |
| Mechanisms not synchronized. | |
| Sunroof vents and opens, but does not close. | Broken or disengaged trough guide |
| Binding cable. | |
| Faulty circuit. | |
| Faulty control switch. | |
| Faulty sunroof electronic module. | |
| Faulty drive motor. | |
| Sunroof vents, but does not open. | Binding cable or mechanism. |
| Faulty circuit. | |
| Faulty switch. | |
| Faulty sunroof electronic module. | |
| Sunroof does not vent | Binding cable or mechanism. |
| Faulty circuit. | |
| Faulty control switch. | |
| Faulty sunroof electronic module. | |
| Sunroof water leak. | Drain tubes clogged or kinked or disconnected from the sunroof. |
| Glass panel improperly adjusted. | |
| Faulty glass panel seal. | |
| Gurgling sound from sunroof | Low spot in drain hose routing, allowing water to stand. |
| Wind noise from sunroof. | Front of glass panel too high or rear too low. |
| Wind deflector not deploying. | |
| Glass not centered in opening. | |
| Faulty glass panel seal. | |
| Rattles from open sunroof while driving | Loose or broken attaching hardware. |
| Worn or broken mechanism. |