GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 1998 🢒 DeVille 🢒 Body and Accessories 🢒 Roof 🢒 Sunroof Replacement

Removal Procedure

    Notice: Use care when removing and installing the headliner. If reusing the headliner lay the headliner down flat on a clean surface. Excessive bending will damage the headliner.


    Object Number: 258904 Size: SH
  1. Lower the headliner. Refer to Headlining Trim Panel Replacement in Interior Trim.
  2. Cycle the glass panel to the rear.

    3. Important: Do not remove the fine-thread machine fasteners (4) second from the rear. Identify the fasteners from the inside of the vehicle.

  3. Remove the fasteners (2) from the cover plates. Start with the rear most fastener on both sides.
  4. Cycle the glass panel to the flush or closed position.
  5. Remove the motor. Refer to Power Sunroof Motor Replacement .

    6. Object Number: 258905 Size: SH
  6. Remove the 2 transmission fasteners (1) at the rear of the sunroof housing.

    7. Object Number: 258906 Size: SH

    Important: 

       • In order to prevent damage to the finish, mask the roof panel in front of the sunroof opening using masking tape and paper.
       • Carefully handle the module by the glass panel. Do not squeeze the module or bend the components.

  7. Remove the sunroof module (1) by lifting upward and forward.

Installation Procedure

    Object Number: 258906 Size: SH
  1. Insert the rear of the module (1) through the roof opening. Index the module on the raised guides on the track.

    2. Important: Do not damage the finish at the front of the opening.

  2. Slide the module (1) into the sunroof opening.

    3. As you slide the module under the rear retaining clips, you will feel resistance during the last 6-9 cm (2-3 in) of travel.

  3. Verify that the module (1) is under the clips. This will prevent noise during travel over road irregularities.
  4. Lower the glass panel into the opening.

    5. Object Number: 258905 Size: SH
  5. Install the 2 fasteners (1) in the transmission.
  6. Install the motor. Refer to Power Sunroof Motor Replacement .
  7. Cycle the glass fully rearward.
  8. Cycle the glass forward 3 mm (0.125 in) in order to remove the load from the bumpers.

    9. Object Number: 258904 Size: SH
  9. Install the 2 rear fasteners (one per side) in the module (3) in order to align the unit.

    10. 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.

  10. Install the 6 fasteners (2).

    11. Tighten
    Tighten the 6 fasteners to 3 N·m (27 lb in).

  11. Inspect for the following conditions:
    12. • Proper operation
    • Proper fit
    • Synchronization
  12. Install the headliner. Refer to Headlining Trim Panel Replacement in Interior Trim.