CAMPAIGN: BRAKE SYSTEM LAMP (REPLACE PROM IN BCM). Buick Riviera 1990

SUBJECT: BRAKE SYSTEM INDICATOR LIGHT

MODELS AFFECTED: CERTAIN 1990 RIVIERA AND REATTA MODELS

The National Traffic and Motor Vehicle Safety Act, as amended, provides that each vehicle which is subject to a recall campaign of this type must be adequately repaired within a reasonable time after the owner has tendered it for repair. A failure to repair within sixty (60) days after tender of a vehicle is prima facie evidence of failure to repair within a reasonable time.

If the condition is not adequately repaired within a reasonable time, the owner may be entitled to an identical or reasonably equivalent vehicle at no charge or to a refund of the purchase price less a reasonable allowance for depreciation.

To avoid having to provide these burdensome solutions, every effort must be made to promptly schedule an appointment with each owner and to repair their vehicle as soon as possible. As you will see in reading the attached copy of the letter which is being sent to owners, the owners are being instructed to contact the Buick Customer Assistance Center if their dealer does not remedy the condition within five (5) days of the mutually agreed upon service date. If the condition is not remedied within a reasonable time, they are instructed on how to contact the National Highway Traffic Safety Administration.

CONDITION

General Motors has determined that certain 1990 Riviera and Reatta model vehicles fail to conform to Federal 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.

DEALER ACTION

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 Riviera and Reatta model vehicles built within the following VIN breakpoints:

PLANT YEAR MODEL PLANT CODE FROM THROUGH ---- ----- ----- ----- ---- ------- 1990 Riviera Hamtramck U LU400001 LU414409 1990 Reatta Reatta Craft B LB900001 LB905131 Centre

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.

This bulletin is notice to you that the new motor vehicles included in this campaign may not comply with Federal Motor Vehicle Safety Standards No. 105 and 101. Under National Traffic and Motor Vehicle Safety Act, Section 108, it is illegal for a dealer to sell a new motor vehicle which the dealer knows does not comply with an applicable Federal Motor Vehicle Safety Regulation. As a consequence, if you sell any of these motor vehicles without first performing the campaign correction, your dealership may be subject to a civil penalty up to $1,000 of each such sale.

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

DEALER MATERIAL

If your dealership has vehicles involved in this campaign, you will receive the following items:

- List of all vehicles involved in this campaign shipped to your dealership.

- One (1) campaign identification label for each vehicle.

Involved vehicles have been identified by Vehicle Identification Number Computer Listings. Computer listings contain the complete Vehicle Identification Number, owner name and address data, and are furnished to involved dealers with the campaign bulletin. Owner name and address data furnished will enable dealers to follow-up with owners involved in this campaign.

These listings may contain owner names and addresses obtained from State Motor Vehicle Registration Records. The use of such motor vehicle registration data for any other purpose is a violation of law in several states. Accordingly, you are urged to limit the use of this listing to the follow-up necessary to complete this campaign. Any dealer not receiving a computer listing with the campaign bulletin has no involved vehicles currently assigned.

OWNER NOTIFICATION

Owners will be notified of this campaign on their vehicles by Buick Motor Division (see copy of owner letter included with this bulletin).

CHANGE OF OWNER INFORMATION

Dealers are to use the Dealer Communication System (D.C.S.) to provide Buick Motor Division with subsequent Buick owner information. By reporting a change of owner name or address of a vehicle in campaign status over the D.C.S., the need to send in a CVAR form for that vehicle is eliminated. Terminal input instructions are covered in the D.C.S. Manual under Section 9, Pages 9-JOlA and B.

PARTS INFORMATION

Parts required to complete this campaign are to be obtained from General Motors Service Parts Operations (GMSPO). To ensure these parts will be obtained as soon as possible, they should be ordered from GMSPO on a "C.I.O." order with no special instruction code, but on an advise code (2).

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

SERVICE PROCEDURE

1. Key off, remove key from ignition.

2. Remove CPS fuse #5 from fuse block (left side of center 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 insure 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.

CAMPAIGN IDENTIFICATION LABEL

Each vehicle corrected in accordance with the instructions outlined in this Product Campaign Bulletin will require a "Campaign Identification Label." Each label provides a space to include the five (5) digit dealer code of the dealer performing the campaign service. This information may be inserted with a typewriter or a ball point pen.

Each "Campaign Identification Label" is to be located on the radiator core support in an area which will be visible when the vehicle is brought in for periodic servicing by the owner. Apply "Campaign Identification Label" only on a clean, dry surface.

DISPOSITION OF REPLACED PARTS

Replaced parts must be held for disposition by Buick Zone/Branch contact personnel. Parts must have a claim tag attached showing the repair order and the VIN of the vehicle from which they were removed.

WARRANTY INFORMATION

Sublet Part Failed Part Failure Labor Labor Other DLR. Oper. Count Part No. Allow. Code Op.No. Hours Hours MTL.TWG. ---- ----- -------- ------ ------- ------ ----- ----- --------

o Inspect and replace PROM

1 16159594 ** 96 V6920 0.4 *0.l

* Campaign Administrative Allowance

** List current dealer price, plus 30% of installed part

Dear Buick Owner:

This notice is sent to you in accordance with the requirements of the National Traffic and Motor Vehicle Safety Act.

REASON FOR RECALL

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

WHAT WE WILL DO

To correct this condition, your Buick dealer will replace the PROM in the Body Computer Module.

This service will be performed for you at no charge.

WHAT YOU SHOULD DO

Please contact your Buick dealer as soon as possible to arrange a service date. Instructions for making this correction have been sent to your dealer and parts are currently available. The labor time necessary to perform the replacement is 25 minutes. Please ask your dealer if you wish to know how much additional time will be needed to schedule and process your vehicle.

Your Buick dealer is best equipped to obtain parts and provide service to insure that your vehicle is corrected as promptly as possible. If, however, you take your vehicle to your dealer on the agreed service date, and they do not remedy this condition on that date or within five (5) days, we recommend you contact the Buick Customer Assistance Center by calling 1-800-521-7300.

After contacting your dealer and the Customer Assistance Center, if you are still not satisfied that we have done our best to remedy this condition without charge and within a reasonable time, you may wish to write the Administrator, National Highway Traffic Safety Administration, 400 Seventh Street, S.W., Washington, D.C. 20590 or call 1-800-424-9393 (Washington D. C. residents use 366-0123).

The enclosed owner reply card identifies your vehicle. Presentation of this card to your dealer will assist in making the necessary correction in the shortest possible time. If you have sold or traded your vehicle, please let us know by completing the postage paid reply card and returning it to us.

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

Buick Motor Division GENERAL MOTORS CORPORATION

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.