For 1990-2009 cars

# CAMPAIGN: LOW VACUUM BRAKE MODULE NOT INSTALLED

#### MODELS: 1985 Buick Electra and Oldsmobile Ninety-Eight Models with LT7 4.3L Diesel Engines (VIN Engine Code T)

ALL AFFECTED DEALERS:

#### DEFECT INVOLVED:

General Motors of canada has determined that some 1985 Buick Electra and Oldsmobile Ninety-Eight models equipped with diesel engines may have been assembled without the low vacuum brake module. Without this module, the "brake" warning light located above the speedometer would not be turned on if the vacuum in the brake booster should go to a low level.

To correct this condition, Dealers are to check to determine if the module was installed on vehicles involved and, if required, install the module.

#### VEHICLES INVOLVED:

Certain 1985 Buick Electras and Oldsmobile Ninety-Eights equipped with an LT7 4.3L Diesel Engine (engine VIN Code T) and falling within the following VIN breakpoints:

#### Model Plant From To ----- ----- ---- -- Buick ----- Electra 1 SOP F1501900

#### Oldsmobile

Ninety-Eight 1 SOP F1351213

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 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 any other purpose.

#### PARTS INFORMATION:

Low vacuum brake module, part number 25516367, is to be ordered through regular channels.

#### PARTS AND LABOUR CLAIM INFORMATION:

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

Repair Code Operation Time Allowance ----------- --------- --------------- 1A Inspection Only .3 2A Inspect and Replace .5 Module

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

A. Inspection ----------

1. With ignition "off", apply brake pedal until vacuum is depleted from brake booster (firm pedal is obtained).

2. With parking brake fully released, turn ignition to "on". Do not start engine.

a. If the "brake" warning light turns "on" in 15 to 45 seconds, no further action is required, except to install a campaign identification label (Part C of procedure).

b. If brake warning light does not turn "on" after waiting 45 seconds, install a low vacuum module, part number 25516367 (Part B of procedure).

B. Low Vacuum Module Installation ------------------------------ 1. Disconnect cable from battery.

2. Remove right lower instrument panel insulator panel.

3. Remove and discard ECM harness shield. Refer to illustration.

4. Plug low vacuum module into its wiring connector. Refer to View A of illustration.

5. Tape module to ECM harness as shown in illustration.

6. Reinstall insulator panel.

7. Reconnect battery cable.

8. Repeat step 2 of "Inspection" procedure to insure low vacuum warning system operates and correct as required.

9. Install Campaign Identification Label.

#### INSTALLATION OF CAMPAIGN IDENTIFlCATION 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 some 1985 Buick Electra and Oldsmobile Ninety-eight models equipped with diesel engines may have been assembled without the low vacuum brake module. Without this module, the "brake" warning light located in the instrument panel above the speedometer would not be turned on if the vacuum in the brake booster should go to a low level. To correct this condition, your Dealer will determine if the module was installed, and, if required, will install a module. This service will be done at no charge to you.

Please contact your Dealer to arrange a service date. The time required to perform this service is about 15 minutes. Please ask your Dealer if you wish to know how much additional time will be necessary to process your vehicle.

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.

Further assistance, if required, may be obtained from the General Motors Zone Office nearest you. Your vehicle Owner's Manual provides the location and phone number of each respective Zone Office.

We are sorry to cause you this inconvenience; however, we hdve taken the action in the interest of your continued satisfaction with our products. Your prompt cooperation would be appreciated.

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.