GM Service Manual Online
For 1990-2009 cars only

Sunroof Track Timing/Synchronization MD4

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 sunroof window. Refer to Sunroof Window Replacement .
  5. Manually slide the mechanism forward in the track until the mechanism reaches the hard stop.

  6. Object Number: 1549379  Size: SH
  7. 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).

  8. Object Number: 1549380  Size: SH
  9. Insert a pin (1) in the holes to hold the position while installing the drive motor.
  10. Important: Both mechanisms should now be in the closed position.

  11. 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).

  3. Install the motor/actuator. Refer to Sunroof Motor/Actuator Replacement .
  4. Tighten
    Tighten the motor attachment screws to 3.5 N·m (31 lb in).

  5. Connect the electrical connector to the motor/actuator.

  6. Object Number: 1549380  Size: SH
  7. Remove the pin (1) from the holes that held the position while installing the drive motor.
  8. Install the headliner. Refer to Headlining Trim Panel Replacement .
  9. Perform the Initialization/Teach Procedure. Refer to Sunroof Motor/Actuator Initialization/Teach Process .
  10. Verify the operation of the sunroof.