CAMPAIGN: INFLATOR MODULE S.I.R. INFORMATION

SUBJECT: SUPPLEMENTAL INFLATABLE RESTRAINT (SIR) INFLATOR MODULE

MODELS AFFECTED: 1990 RIVIERA (ADDITIONAL VEHICLES)

Please refer to Bulletin 90-C-9 dated December, 1990, for additional information. This bulletin adds 37 additional vehicles to campaign, a labor operation for inspection, procedure for inspection only, and revises owner letter for this group of vehicles. Of the additional vehicles, only two (2) should require SIR Inflator Module replacement.

ADDITIONAL VEHICLES INVOLVED

Additional 1990 Riviera model vehicles involved are indicated below:

SERVICE SERIAL NUMBER PROCEDURE -------------- ---------------------------- LU407250 Replace SIR Inflator Module LU412149 * Inspect LU412165 * Inspect LU412166 * Inspect LU412168 * Inspect LU412188 * Inspect LU412190 * Inspect LU412191 * Inspect LU412197 * Inspect LU412198 * Inspect LU412205 * Inspect LU412211 * Inspect LU412216 * Inspect LU412219 * Inspect LU412229 * Inspect LU412233 * Inspect LU412236 * Inspect LU412238 * Inspect LU412251 * Inspect LU412253 * Inspect LU412259 * Inspect LU412260 * Inspect LU412279 * Inspect LU412287 * Inspect LU412288 * Inspect LU412291 * Inspect LU412292 * Inspect LU412298 * Inspect LU412301 * Inspect LU412303 * Inspect LU412304 * Inspect LU412308 * Inspect LU412309 * Inspect LU412313 * Inspect LU412315 * Inspect LU412326 * Inspect LU412340 * Inspect

* Inspect SIR Inflator Module for 14 digit Bar Code AB9637IEKAAH53.

DEALER ACTION

On vehicles listed above with an asterisk (*), dealers are to inspect the 14 digit bar code label on the back side of the SIR Inflator Module for bar code AB9637IEKAAH53 and replace if the above code is found or if no bar code label is present. On VIN LU407250, the SIR Inflator Module is to be replaced with no inspection required.

PARTS INFORMATION

If part is required, contact TRW - Mesa, AZ between 8:00 a.m. and 4:00 p.m. Pacific Standard Time, Monday through Friday, by calling 1-800-346-0311 and asking for Frances Angelski. Provide her with the last eight (8) digits of the VIN, your shipping address, phone number, and to whose attention you want the part shipped. Parts in most cases will be shipped overnight express.

IMPORTANT: SIR Inflator module for LU407250 should be ordered in advance. All other additional vehicles will require inspection to determine if inflator module replacement is required.

SERVICE PROCEDURE FOR INSPECTION: (Refer to Bulletin 90-C-9 for replacement procedure)

Refer to 1990 Riviera and Reatta Service Manual - Section 3F4

1. Read precautions on handling SIR Inflator Module (pages 2 and 3 of Section 3F4).

2. Disable the SIR system (page 2 of Section 3F4).

3. Remove the four (4) screws retaining the Inflator Module from steering wheel assembly.

4. Check back side of Inflator Module for bar code AB9637IEKAAH53.

5. a. If bar code matches, replace Inflator Module. Refer to replacement procedure (pages 4 and 5 of Section 3F4).

b. If bar code is not present, replace Inflator Module. Refer to replacement procedure (pages 4 and 5 of Section 3F4).

c. If bar code does not match, reinstall four (4) screws.

6. Enable the SIR system (page 3 of Section 3F4).

7. Install Campaign Label.

IMPORTANT: If replacement is required after inspection, please hold vehicle until replacement is completed. Owner should be provided a loaner, if desired.

WARRANTY INFORMATION

PART FAILED PARTS FAILURE LABOR LABOR OTHER DEALER OPER COUNT PART NO ALLOW CODE OP NO. HOURS HOURS MTL TWG ---- ----- ------- ----- ------ ------ ----- ----- ------- o Inspect SIR Inflator Module 14 Digit Bar Code --- --- 96 V6641 0.5 *0.1 ---

o Inspect and Replace SIR Inflator Module --- 96 V6640 0.5 *0.1 **$113.40

* 0.1 Hour for Administration

** $113.40 represents 30% of current dealer price of furnished part. Also include cost of loaner vehicle if provided, zone/branch authorization will be required for loaner.

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

REASON FOR THIS RECALL

General Motors has determined that a defect which relates to motor vehicle safety exists in some 1990 Buick Riviera and Reatta model vehicles. In the event of an accident requiring deployment of the driver's side Supplemental Inflatable Restraint (SIR), the SIR Inflator Module located in the steering wheel assembly could separate. If separation occurs, the air bag will not inflate as intended, and the driver will not be properly restrained. In addition, separation of the SIR Inflator Module may result in hot combustion gases escaping into the occupant compartment, presenting the possibility that vehicle occupants could receive burn injuries.

WHAT WE WILL DO

To correct this condition, your dealer will inspect and replace, if necessary, the SIR Inflator 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 available. (Your zone/branch has been instructed to try to contact you.) The labor time necessary to perform this inspection/correction is approximately thirty (30) 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 ensure 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, Flint Home Office, 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.

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.