GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2009 🢒 LaCrosse 🢒 Roof 🢒 Sunroof 🢒 Sunroof Track Timing/Synchronization

Removal Procedure
  1. It is only necessary to lower the headliner. Only do those step in headliner replacement that will lower the headliner enough to gain access to the part. 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
  6. 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).

    7. Object Number: 1549380 Size: SH
  7. Insert a pin (1) in the holes to hold the position while installing the drive motor.

    8. Note: Both mechanisms should now be in the closed position.

  8. Repeat this procedure for the opposite side.

Installation Procedure

    Caution: Refer to Fastener Caution 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).

  2. Install the motor/actuator. Refer to Sunroof Motor/Actuator Replacement.

    3. Tighten
    Tighten the motor attachment screws to 3.5 N·m (31 lb in).

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

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