GM Service Manual Online
For 1990-2009 cars only

Circuit Charts

SYMPTOM

PROCEDURE

The sunroof is inoperable.

Chart 1

Both the sunroof and the power windows are inoperable.

Chart 2

The sunroof operates slowly.

    • Check the tracks for binding.
    • Ensure the proper lubrication is present in the mechanisms.
    • If the sunroof still operates slowly, inspect the sunroof module for internal damage/binding.

The sunroof operates noisily.

    • Check the tracks for binding.
    • Ensure the proper lubrication is present in the mechanisms.
    • If the sunroof still operates noisily, inspect the sunroof motor.
    • If the sunroof still operates noisily, inspect the sunroof module for internal damage/binding.

Only the sunroof VENT position does not operate.

    • Replace the sunroof switch.
    • If the sunroof still does not vent, inspect the sunroof module for internal damage/binding.
    • Verify for proper timing of the motor and guide assembly. Refer to Sunroof Actuator (Motor) to Module Timing.

Chart 1


Object Number: 875110  Size: FP

Chart 2


Object Number: 875111  Size: FP

Object Number: 875112  Size: FP