GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

    Important:  The sunroof actuator can be replaced with the glass in any position. The sunroof actuator contains no limit switches and can rotate its drive shaft in either direction.

  1. Remove the headliner. Refer to Headlining Trim Panel Replacement in Interior Trim.

  2. Object Number: 594492  Size: SH
  3. Remove the tie strap from the wiring harness.
  4. Remove the sunroof actuator (1) to sunroof module screws.

  5. Object Number: 647198  Size: SH
  6. Disconnect the sunroof actuator electrical harness from the sunroof module harness.
  7. Pull the sunroof actuator straight down to disengage the drive gear.
  8. Remove the sunroof actuator from the sunroof module.

Installation Procedure


    Object Number: 594492  Size: SH
  1. Align the sunroof actuator to the sunroof module.
  2. Push the sunroof actuator (1) straight in to engage its drive gear into the Position Encoding System (PES) Module.
  3. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  4. Install the sunroof actuator to sunroof module screws.
  5. Tighten
    Tighten the sunroof actuator to sunroof module screws to 2.75 N·m (24 lb in).


    Object Number: 647203  Size: SH
  6. Connect the sunroof actuator electrical harness to the sunroof module harness.
  7. Install the wiring harness to sunroof module tie-straps.
  8. Check the operation of the sunroof module in all positions.
  9. Install the headliner. Refer to Headlining Trim Panel Replacement in Interior Trim.