GM Service Manual Online
For 1990-2009 cars only

Sunroof Track Timing/Synchronization PES

Removal Procedure

  1. Remove the headliner. Refer to Headlining Trim Panel Replacement .
  2. Disconnect the electrical connector from the motor/actuator.
  3. Remove the motor/actuator. Refer to Sunroof Motor/Actuator Replacement .
  4. Remove the screw that attaches the control module.

  5. Object Number: 1542794  Size: SH
  6. Install a pin temporarily in the holes to hold the position while installing the drive motor.
  7. Remove the sunroof window. Refer to Sunroof Window Replacement .
  8. Manually slide the mechanism forward in the track until the mechanism reaches the hard stop.

  9. Object Number: 1549379  Size: SH
  10. Push the cam assembly (2) forward until the timing hole (3) in the cam is aligned with the timing hole (4) in the lifter arm (1).
  11. Important: Both mechanisms should now be in the closed position.

  12. Repeat this procedure for the opposite side.

Installation Procedure

    Notice: Refer to Fastener Notice in the Preface section.

  1. Install the sunroof window. Refer to Sunroof Window Replacement .
  2. Tighten
    Tighten the screws to 4 N·m (35 lb in).


    Object Number: 1542796  Size: SH

    Important: Before installing the sunroof opening position switch, inspect the timing window. The small hole must be in line with the bar, as shown. If the hole is not aligned with the bar, rotate the gear by hand left or right until the hole and the bar are in position.

  3. Install the control module.
  4. Install the motor/actuator. Refer to Sunroof Motor/Actuator Replacement .

  5. Object Number: 1542794  Size: SH
  6. Remove the pin that was installed to temporarily hold the position of the sunroof opening position switch.
  7. Tighten
    Tighten the motor/actuator attachment screws to 3.5 N·m (31 lb in).

  8. Connect the electrical connector to the motor/actuator.
  9. Install the headliner.
  10. Important: If the sunroof does not function properly, and the guides are parallel, then replace the sunroof opening switch.

  11. Verify the operation of the sunroof.