Component Tests and General Diagnostics

SUNROOF

Refer to SUNROOF DIAGNOSIS CHART for possible causes. Before beginning sunroof diagnostics verify that all other power accessories are in proper operating condition. If not, a common electrical problem may exist. Refer to Wiring Diagrams, in this publication for circuit, splice and component descriptions. Check the condition of the circuit protection (20 amp circuit breaker in the Junction Block). Inspect all wiring connector pins for proper engagement and continuity. Check for battery voltage at the power sunroof controller, refer to 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.

Every time the sunroof module loses power it must be initialized. To initialize the motor, connect power to the sunroof and press the close-button until the glass panel has reached the full-close position. There will be a slight "kick" of the glass panel when initialization occurs if the glass panel starts in the full-close position. The "kick" is accompanied by a soft tick noise. This is the indication that the sunroof module is initialized









WATER DRAINAGE AND WIND NOISE DIAGNOSIS

The sliding glass panel is designed to seal the opening with a snug but not perfectly water tight fit between the roof and the seal. The fit can be checked by inserting a business card or equivalent, between the roof and the seal. The piece of paper should have some resistance when pulled around the opening with the glass panel in the closed position. This check can only be complete when both the glass seal and the roof are dry. The sunroof housing will drain off a minimum amount of water. Excessive wind noise could result if the gap clearances are exceeded. The sunroof glass panel may need to be adjusted. Adjustments

Adequate drainage is provided by a drain trough in the sunroof housing which encircles the sliding glass panel and leads to drain hoses. If a wet headliner or other water leak complaints are encountered, before performing any adjustments, first ensure that the drainage system is not plugged or disconnected. Use a pint container to pour water into the sunroof housing drain trough. If water flow is restricted, use compressed air to blow out any material plugging the drain system. Retest system again.

To further check for a disconnected drain hose:

NOTE: Care must be taken not to fold or kink the headliner upon removal.

1. Lower headliner as necessary to gain access to sunroof housing drain tubes. Headliner - Removal
2. Repair as necessary.