CAMPAIGN: LOSS OF HEADLIGHTS REPLACE EPROM IN BCM

MODELS: 1986-87 SEVILLES AND ELDORADOS

General Motors of Canada has determined that a defect which relates to motor vehicle safety exists in all 1986 and some 1987 Sevilles and Eldorados. The Twilight Sentinel potentiometer (thumbwheel control) might have been manufactured with electrical contacts which could potentially result in an intermittent headlight circuit. With the Twilight Sentinel System ON, this intermittent circuit could cause the headlights and instrument panel lights to go out. Sudden loss of the instrument panel lights in times of reduced visibility could make locating and activating the manual headlight switch difficult. Sudden loss of the headlights could reduce driver visibility which might result in a vehicle crash without prior warning.

THE MANUAL HEADLIGHT SWITCH (BUTTON) WILL TURN THE HEADLIGHTS ON.

DEALER ACTION

To prevent this condition from occurring, Dealers are required to replace the EPROM in the Body Control Module (BCM) on suspect vehicles per Vehicles Involved and Service Procedure sections of this bulletin.

VEHICLES INVOLVED

All 1986 Sevilles and Eldorados require this campaign. In addition, all early 1987 Sevilles and Eldorados within the following range require this campaign.

1987 Sevilles - HU800001 through HU809258 1987 Eldorados - HU600001 through HU608469

All affected vehicles have been identified by to involved Dealers with this bulletin. Any Dealer not provided the VIN listing receiving a listing was not shipped any of the affected vehicles.

DEALER CAMPAIGN RESPONSIBILITY:

Dealers are to service all vehicles subject to this campaign at no charge to owners, regardless of mileage, age of vehicle, or ownership, from this time forward.

Whenever a vehicle subject to this campaign is taken into your new or used vehicle inventory, or it is in your Dealership for service in the future, you should take the steps necessary to be sure the campaign correction has been made before reselling or releasing the vehicle.

Owners of vehicles recently sold from your new vehicle inventory are to be contacted by the Dealer, and arrangements made to make the required modification according to instructions contained in this bulletin.

CAMPAIGN PROCEDURE:

Refer to Section 4 of the Service Policies and Procedures Manual for the detailed procedure on handling Product Campaigns. Dealers are requested to complete the campaign on all transfers as soon as possible.

OWNER NOTIFICATION:

All owners of record at the time of campaign release are shown on the attached computer listing and have been notified by first class mail from General Motors. The listings provided are for campaign activity only and should not be used for an .y other purpose.

PARTS INFORMATION:

Parts required for this campaign should be ordered through regular channels, as follows: Part Model Number ----- ------ 1986 Eldorado and Seville 1228483 Calibrator (EPROM)-Body Multi- Function Electric Computer

1987 Eldorado and Seville 16075605 Calibrator (EPROM)-Body Multi- Function Electric Computer

PARTS AND LABOUR CLAIM INFORMATION:

Credit for the campaign work performed will be paid upon receipt of a properly completed campaign claim card, RAPID terminal or DCS transmission in accordance with the following:

Repair Code Operation Time Allowance ----------- --------- --------------- 2A Replace Calibrator .5 1986 Seville or Eldorado

3A Replace Calibrator .5 1987 Seville or Eldorado

Time allowance includes 0.1 hour for Dealer administrative detail associated with this campaign. Parts credit will be based on Dealer net plus 30% to cover parts handling.

SERVICE PROCEDURE

1. Remove the Body Control Module (BCM) and the BCM EPROM in accordance with the Service Procedure in Section 8C of the 1986/1987 Cadillac Service Information Manual - Eldorado and Seville.

2. Install new service EPROM into the EPROM socket of the BCM(Refer to Section 8C; 986/1987 Cadillac Service Information Manual - Eldorado and Seville).

3. Install BCM onto vehicle in accordance with the above stated procedure.

4. Install the Campaign Completion Label on a clean, dry surface of the radiator support tie bar.

INSTALLATION OF CAMPAIGN IDENTIFICATION LABEL

Clean surface of radiator upper mounting panel and apply a Campaign Identification Label. Make sure the correct campaign number is inserted on the label. This will indicate that the campaign has been completed.

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.