GM Century/Lumina/Grand Prix/Intrigue 1997-2000

Power Sunroof

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A power sunroof is an option on W-Body vehicles. It features a sliding window panel and a manually operated sunshade. The sunroof is electrically operated from a rocker switch located in the center of the windshield header area. To put the sunroof in the vent position, turn the ignition switch to the RUN position and press, then release the control switch rearward position. On Pontiac and Chevrolet vehicles, when the control switch rearward position is pressed and released with the window in the vent position, the window will slide back above the roof panel to the fully open position. On Buick and Oldsmobile vehicles, the window will retract downwards and slide rearward into the storage space between the roof panel and the headliner. Both vehicles are equipped with a wind deflector that extends just above the roof line when the window panel is in the open position. To close, hold the control switch in the forward position until the window completely closes, retracting the wind deflector and sealing against the roof opening flange. An express module at the front of the module causes the window panel to stop in the closed, vent, and fully open positions. An electrical harness is routed along the left portion of the windshield header and down the left windshield pillar.

MOTOR REPLACEMENT



Pontiac

WARNING
The sunroof system is timed from the factory so that the actuator (motor) shuts off automatically when the sunroof window reaches a certain position. Extreme care must be taken when removing the actuator from the sunroof module or this timing may be thrown off causing damage to the sunroof system. Anytime the actuator needs to be removed from the module, the sunroof window must be in the fully closed position. GM specifies that their tool set, J 41718 Sunroof Timing Pins, be used when servicing the sunroof actuator.

  1. Remove the sunroof window using the following procedure:
    1. Slide the sunshade fully rearward.
    2.  
    3. Move the sunroof window to the vent position.
    4.  
    5. Locate and remove the sunroof window screws (3 each side).
    6.  
    7. Remove the sunroof window from the sunroof module assembly.
    8.  

  2.  
  3. After removing the window, place the sunroof module in the fully closed position.
  4.  
  5. Remove the headliner using the procedure found in this section.
  6.  
  7. Detach the sunroof actuator (motor) electrical connection from the actuator.
  8.  
  9. Thread J 41718 Sunroof Timing Pins, or equivalent), into the front sunroof window screw holes to retain the cable adjustment. Make sure the Timing Pins (or their equivalent) are tight and holding the cable before removing the actuator.
  10.  
  11. Remove the sunroof actuator retaining screws and separate the actuator from the vehicle.
  12.  



Click image to see an enlarged view

Fig. Typical W-Body sunroof switch and actuator (motor) arrangement

To install:

  1. Install the sunroof actuator to the sunroof module assembly and tighten the screws to 35 inch lbs. (4 Nm).
  2.  
  3. Remove the timing pins, or their equivalent, from the sunroof window screw holes.
  4.  
  5. Attach and secure the electrical connector.
  6.  
  7. Install the headliner using the procedure found in this section.
  8.  
  9. Install the sunroof window using the following procedure:
    1. Install the sunroof window to the module assembly making sure the information/logo stencil is towards the rear of the opening.
    2.  
    3. Install the sunroof window screws, starting with the center screws first. Tighten to 35 inch lbs. (4 Nm).
    4.  
    5. Adjust the sunroof window using the procedure found in this section.
    6.  
    7. Open and close the sunroof window to recheck the fit of the window.
    8.  

  10.  

Chevrolet

WARNING
Use care when servicing the sunroof motor and drive gear assembly. The sunroof motor has an internal microswitch when opens the motor circuit (turns the motor off) when the window reaches the full vent position. If you remove the sunroof motor from the module (sunroof assembly) and then function the motor or change the position of the sunroof window while the motor is removed, the timing of the sunroof motor will be out of phase. Putting the motor back into the sunroof assembly while out of phase will cause loss of the vent position. Do not run the motor while the motor is hanging loose in the vehicle. If the motor and module become out of phase, the motor will have to be retimed to the sunroof module.

  1. Remove the headliner using the procedure found in this section.
  2.  
  3. Remove the sunroof switch by grasping the switch on its left and right side and pulling straight downward to disengage it from its mounting bracket.
  4.  
  5. Remove the motor attaching screws and separate the motor and drive gear assembly from the vehicle.
  6.  

To install:

  1. Install the motor and drive gear assembly to the sunroof. Tighten the screws to 35 inch lbs. (4 Nm).
  2.  
  3. Install the headliner and sunroof switch.
  4.  
  5. Retime the sunroof motor, as follows:
  6.  
  7. With the sunroof motor removed from the vehicle, back-probe the connector with an ohmmeter.
  8.  
  9. Connect the meter leads between the white and yellow wires located at the gear housing portion of the motor.
  10.  
  11. Insert a large, flat-bladed tool into the motor gear slot. Rotate the sunroof motor gear counterclockwise (turning the flat-bladed tool clockwise) until the ohmmeter shows Open Circuit. This positions the gear drive to FULL VENT.
  12.  


NOTE
It may take up to eleven rotations to reach the Open Circuit position.

  1. Continue to turn the motor gear drive exactly 1 1 / 2 additional turns counterclockwise. This will retime the motor to the fully closed position. Make sure the sunroof window is in the fully closed position.
  2.  
  3. Install the sunroof motor to the vehicle using the procedure found in this section.
  4.  

Buick and 1998-99 Oldsmobile Intrigue

WARNING
Before removing the sunroof actuator, position the system in the fully closed position. Do not move the sunroof mechanism while the actuator is not in place.

  1. Remove the headliner using the procedure found in this section.
  2.  
  3. Cut the tie straps from the wiring harness.
  4.  
  5. Detach the electrical connector, remove the actuator screws and separate the actuator from the sunroof assembly.
  6.  

To install:

  1. Install the actuator to the sunroof and tighten the screws to 35 inch lbs. (4 Nm).
  2.  
  3. Attach and secure the electrical connector to the actuator. Use nylon wire tires to secure the harness, as required.
  4.  
  5. Install the headliner using the procedures found in this section.
  6.  

1997 Oldsmobile Cutlass Supreme
  1. Position the sunroof at its maximum vent position.
  2.  
  3. Remove the headliner using the procedure found in this section.
  4.  
  5. Detach the electrical connection from the motor and drive gear assembly.
  6.  
  7. Remove the screws holding the motor to the motor support bracket.
  8.  
  9. Carefully pull the motor down to disengage the gear from the drive cables.
  10.  

To install:

  1. Install the motor to the sunroof.
  2.  
  3. Check that the sunroof is at the maximum vent position by manually pushing the mechanism forward on both sides. This aligns the drive cables.
  4.  
  5. Install the motor in an upward position so the gear engages between the drive cables.
  6.  
  7. Install the motor retaining screws and tighten screws to 35 inch lbs. (4 Nm).
  8.  
  9. Attach the electrical connector.
  10.  
  11. Install the headlining using the procedure found in this section.
  12.  

2000 Oldsmobile Intrigue

Starting with model year 2000, the Oldsmobile Intrigue sunroof actuator (motor) is a "dumb motor". Its driveshaft turns in both directions, but it contains no limit switches. The sunroof actuator can be replaced with the glass in any position. The sunroof actuator contains no limit switches and can rotate its driveshaft in either direction.



Click image to see an enlarged view

Fig. Sunroof actuator (motor) assembly and fastener arrangement-2000 Oldsmobile Intrigue

  1. Remove the headliner using the procedure in this section.
  2.  
  3. Remove the tie strap from the wiring harness.
  4.  
  5. Remove the sunroof actuator retainer screws.
  6.  
  7. Detach the actuator electrical connector Pull the actuator straight down to disengage the drive gear and remove the actuator from the vehicle.
  8.  

To install:

  1. Align the sunroof actuator to the sunroof module.
  2.  
  3. Push the sunroof actuator straight in to engage its drive gear into the Position Encoding System Module. Install the screws just snug. The torque specification is only 24 inch lbs. (2.75 Nm).
  4.  
  5. Attach the electrical connector to the harness. Install tie-straps as required.
  6.  
  7. Check the operation of the sunroof in all positions.
  8.  
  9. Install the headliner.
  10.  

SUNROOF ADJUSTMENT



Sunroof Vertical Height Adjustment
EXCEPT CUTLASS SUPREME

Adjust the sunroof window vertical height using the following procedure.

  1. The sunshade must be fully open and the window fully closed.
  2.  
  3. Loosen the six screws and individually adjust the four corners of the window panel.
  4.  
  5. Adjust the front of the sunroof window to the following specifications:
    1. Buick and Pontiac: 1 / 32 (0.8mm) below the top surface of the roof panel and the rear 1 / 32 (0.8mm) above the top surface.
    2.  
    3. Chevrolet and Oldsmobile: front of the window should be flush to 0.080 inch (2mm) below the roof surface and the rear of the window should be flush to 0.080 inch (2mm) above the roof surface.
    4.  

  6.  
  7. Buick and Pontiac: Tighten the screws to 35 inch lbs. (4 Nm).
  8.  
  9. Chevrolet and Oldsmobile: Tighten the screws to 44 inch lbs. (5 Nm).
  10.  

CUTLASS SUPREME
  1. Position the sunroof to vent.
  2.  
  3. Slide the upper half of the mechanism cover rearward until the cover clips disengage from the side adjustment bracket.
  4.  
  5. Remove the cover.
  6.  
  7. Close the window panel and separately loosen the four adjusting bolts (two on each side) and individually adjust the four corners of the windows.
  8.  
  9. Adjust the front of the window panel to be 1 / 32 (0.8mm) below the top surface of the roof panel and the rear to be 1 / 32 (0.8mm) above the top surface.
  10.  
  11. Tighten the screws just 44 inch lbs. (5 Nm).
  12.  

 
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