For 1990-2009 cars

# CAMPAIGN: BRAKE SYS. INDICATOR LIGHT INOPERABLE

#### Subject: BRAKE SYSTEM INDICATOR LIGHT

#### Models: Certain 1990 Buick Riviera and Reatta Models

General Motors of Canada has determined that certain 1990 Buick Riviera and Reatta model vehicles fail to conform to Canada Motor Vehicle Safety Standards 105, "Hydraulic Brake Systems" and 101, "Controls and Displays."

These vehicles have a brake system indicator light which does not light when the ignition is in the "on" position, the parking brake applied, and the shift selector in the (P) park or (N) neutral gear range. The light functions properly in all other shift selector gear ranges.

To correct this condition, dealers are to replace the PROM (Programmable Read Only Memory) in the BCM (Body Computer Module).

#### VEHICLES INVOLVED:

Involved are certain 1990 Buick Riviera and Reatta model vehicles built within the following VIN breakpoints:

Year Model Plant Plant Code From Through ------ ------- --------- --------- -------- ------- 1990 Riviera Hamtramck U LU400001 LU414409

1990 Reatta Reatta Craft Centre B LB900001 LB905131

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

#### DEALER CAMPAIGN RESPONSIBILITY:

Dealers are to perform this campaign on all involved vehicles at no charge to owners, regardless of kilometres traveled, 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, you are to ensure the campaign correction has been made before selling 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 any other purpose.

#### PARTS INFORMATION:

Parts required to complete this campaign should be ordered through regular channels, as follows:

Part Number Description Quantity/Vehicle ----------- ------------ ---------------- 16159594 PROM 1

#### PARTS AND LABOUR CLAIM INFORMATION:

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

Repair code Description Time Allowance ----------- --------------------- -------------- 2A Inspect and Replace PROM .5

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. Key off, remove key from ignition.

2. Remove CPS fuse #5 from fuse block (left side of centre console).

3. Remove glove box unit, disconnect BCM connectors, and remove BCM. (Refer to Section 8C of Service Manual for complete procedure).

4. Remove BCM PROM access cover and install replacement PROM P/N 16159594. (Follow instructions sheet provided with replacement PROM to ensure proper insertion.)

5. Install BCM PROM access cover, BCM, BCM connectors, and glove box unit.

6. Reinstall CPS fuse #5.

7. Key on, ensure proper operation. Parking brake indicator light should light with parking brake applied in all gears.

8. Install Campaign Identification Label.

#### 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.

Dear General Motors Customer:

General Motors of Canada has determined that certain 1990 Buick Riviera and Reatta model vehicles fail to conform to Canada Motor Vehicle Safety Standards 105, "Hydraulic Brake Systems" and 101, "Controls and Displays."

These vehicles have a brake system indicator light which does not light when the ignition is in the "on" position, the parking brake applied, and the shift selector in the (P) park or (N) neutral gear range. The light functions properly in all other shift selector gear ranges.

To prevent this condition from occurring, your General Motors dealer will replace the PROM in the Body Computer Module.

This service will be performed for you at no charge.

Please contact your GM dealer as soon as possible to arrange a service date.

If parts are required, ask your dealer for details regarding their availability. If parts are not in stock, they can be ordered before scheduling your service date.

This letter identifies your vehicle. Presentation of this letter to your dealer will assist their Service personnel in completing the necessary correction to your vehicle in the shortest possible time.

Subsequent to contacting your dealer, further assistance, if required, may be obtained from our Customer Assistance Centre, toll free, by calling 1-800-263-3777 (English), or 1-800-263-7854 (French).

We are sorry to cause you this inconvenience; however, we have taken this action in the interest of your continued satisfaction with our products.

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.