ELECTRO STATIC DISCHARGE CAUSE FAILURE TO SUNROOF MODULE

MODELS AFFECTED: 1990 DE VILLES AND FLEETWOODS WITH OPTION CF5

An electrostatic discharge from a vehicle occupant to the 1990 DeVille and Fleetwood sunroof switch could damage the express open sunroof module. If damage to the module occurs, the sunroof will operate in the open direction only (switch pressed rearward).

To eliminate the potential problem, the chrome sunroof switch button is being changed to plastic so that stored static cannot be discharged into the switch. This change took place in production on October 31, 1989.

To repair a vehicle which has experienced electrostatic discharge failure of the module replace the chrome button switch with a new black plastic button sunroof switch, P/N 20436618, and replace the damaged express sunroof module with new module, P/N 12503328.

Temporary action may be taken to allow the vehicle to be driven while awaiting new parts. To close the sunroof glass panel manually:

1. Remove the map light housing to access the sunroof motor.

2. Using a 4mm hex wrench, insert it into the drive gear and turn until the glass reaches the closed position. (The synchronizing lever must be left in the operating position; do not disengage.)

3. Ensure that the opening is sealed properly. Adjust motor as in step 2 until glass aligns to roof.

4. Remove the damaged express module so that the sunroof cannot be operated until properly repaired. The module is located above the passenger seat between the sunroof opening and the door. Refer to Section 10 of the Service Information Manual for parts locations and procedures.

Parts are currently available from GMSPO.

For warranty purposes use Labor Operation T6436 at .4 hour.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.