CAMPAIGN: TORQUE CONVERTER CLUTCH HARNESS MISSING. GMC Truck Jimmy

MODELS: 1985 GMC "S/T" LIGHT DUTY TRUCKS EQUIPPED WITH A 2.8L V6 (B) ENGINE, 70OR4 AUTOMATIC TRANSMISSION (MXO) AND CALIFORNIA EMISSIONS (NB2) - SHREVEPORT ONLY

General Motors has determined that certain 1985 GMC "S/T" Light Duty Trucks equipped with a 2.8L V6 (B) engine code, automatic transmission and California emissions system were built without a Torque Converter Clutch (TCC) wiring harness.

The omission of a Torque Converter Clutch (TCC) wiring harness will not allow the torque converter clutch to engage. This can cause excessive heat build up which may result in premature transmission failure.

VEHICLES INVOLVED

Certain 1985 GMC "S/T" Light Duty Trucks equipped with a 2.8L V6 (B) engine, 70OR4 automatic transmission (MXO) California emissions (NB2) within the following parameters:

Plant From Through ----- ----- ------- Shreveport F8501137 F8502405

The specific vehicles involved in this campaign have been identified by Vehicle Identification Number Computer Listings. These listings are furnished to all involved dealers with the campaign bulletin.

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.

If no owner's name and address were available to GMC Truck at the time of campaign initiation, the dealer will determine the owner's name and address from the dealership sales records. Please provide this information directly on the second copy of the listing next to the applicable VIN, so that our records may be updated and the appropriate notification mailed to the owner. This second copy should then be submitted to the address listed below in the previously supplied yellow campaign envelopes.

G M C Truck General Motors Corporation 101 Union Street Plymouth, Michigan 48170

OWNER NOTIFICATION

Owners will be notified of this campaign on their vehicles by GMC Truck (see copy of Owner Letter included with this bulletin). A listing of owner names and addresses has been furnished to the involved dealers to enable dealers to follow up with owners involved in this campaign. This listing 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 this campaign.

INSPECTION PROCEDURE

If vehicle is equipped with cruise control (RPO K34), inspect to determine if transmission torque converter wire, P/N 12038160, has been previously installed and connected to cruise control vacuum release valve, P/N 22509432, as shown in Figure No. 1. If wire and valve have been correctly installed, no correction is required.

If vehicle is not equipped with cruise control, inspect to determine if the transmission torque converter clutch wire, P/N 12038160, has been previously installed and connected to stop lamp switch, P/N 25504628, as shown in Figure No. 2. If wire and switch have been correctly installed, no correction is required.

SERVICE PROCEDURE

If inspection reveals vehicle requires wiring harness and switch, follow the procedure identified below:

1. With ignition key in "off" position, open hood and disconnect negative battery cable.

2. Remove center trim panel, located under the steering column. If vehicle is equipped with custom trim package, it will be necessary to first remove the noise insulator panel located below the center trim panel.

Vehicle Equipped With Cruise Control (RPO K34)

1. Disconnect vacuum hose from cruise control vacuum release valve (located adjacent to stop lamp switch). Remove vacuum release valve and discard.

2. Install black colored male connector plug of new wire assembly P/N 12038160, into IP harness connector (see Figure No. 1).

3. Install clear colored connector plug or new wire assembly into fuse panel cavity marked "IGN."

4. Secure new wire assembly to IP hamess, as shown in Figure No. 1, with two new tie straps (P/N 11501906).

5. Connect remaining clear colored plug of new wire assembly and cruise control vacumm hose to new cruise control vacuum release valve, P/N 25509432, (see Figure No. 1). Install valve into stop lamp switch mounting bracket and adjust (reference Figure No. 3 for shown in Figure No. 1, with two new tie shown in Figure No. 1, with two new tie instruction).

6. Install new U-Nut on center trim panel. Reinstall center trim panel.

7. Route remaining portion of new wire assembly under stop lamp switch and cruise control vacuum release valve. If vehicle is equipped with noise insulator panel, route new wire assembly "ALDL" connector lead through cut out and install noise insulator panel.

8. Position new wire assembly "ALDL" connector so that connector socket points towards the passenger side of vehicle and connector bracket hole aligns with center trim panel, new U-Nut and noise insulator panel if equipped. While holding connector, install new screw through connector bracket and noise insulator panel, if equipped, into new U-Nut and tighten. TEXT ZONE

9. Reinstall negative battery cable, campaign completion label and close hood.

Vehicles Not Equipped With Cruise Control

1. Disconnect IP harness plug from stop lamp switch. Discard stop lamp switch.

2. Install black colored male connector plug of new wire assembly, P/N 12038160, into IP harness connector (see Figure No. 2).

3. Install clear colored male connector plug of new wire assembly into fuse panel cavity marked "IGN."

4. Secure new wire assembly to IP harness, as shown in Figure No. 2, with two new tie straps.

5. Connect IP harness plug that was disconnected and clear female connector plug of new harness to new stop lamp switch, P/N 25504528 (see Figure No. 2).

Install and adjust new stop lamp switch (reference 1985 Light Duty Truck Service Manual, Page 8B-17, for instructions).

Follow steps 6 thru 9 to complete Service Procedure.

PARTS INFORMATION

Parts required to complete this campaign will be shipped to involved dealers by GMC Truck on a no charge basis. Any questions as it pertains to parts shortages, etc., should be directed to your Zone Service Department.

The following parts required for each vehicle equipped with cruise control (RPO K34) will be packaged together and marked "with K34".

Part Qty. Number Description Per Vehicle ------ ----------- ----------- 12038160 Wire Assembly 1 25509432 Cruise Control Vacuum 1 Release Valve 11501906 Tie Strap 2 9433157 U-Nut 1 11503646 Screw 1

The following parts required for each vehicle not equipped with cruise control (minus RPO K34) will be packaged together and marked "without K34".

Part Qty Number Description Per Vehicle ------ ----------- ------------ 12038160 Wire Assembly 1 25504628 Stop Lamp Switch 1 11501906 Tie Strap 2 9433157 U-Nut 1 11503646 Screw 1

DO NOT ORDER PARTS FROM WDDGM.

WARRANTY INFORMATION

Dealers should submit an accurately filled out Warranty Repair Order on each vehicle completed under this campaign.

Labor Operation *Time Trouble Parts Number Description Allowance Code Allowance ------ ----------- ---------- ---- --------- V3000 Inspect for 0.2 Hrs. 96 converter clutch wire assy. & correct switch. No Further Action Required.

V3001 Install new 0.4 Hrs. 96 $4.06 converter clutch wire assy.& stop lamp switch (vehicle not equipped with cruise control RPO K34).

V3002 Install new 0.4 Hrs. 96 $5.96 converter clutch wire assy. & new cruise control vacuum release valve (vehicle equipped with cruise control RPO K34).

*For dealer to receive Administration Time Allowance associated with this campaign, add 0.1 Hr. to the Labor Operation Time Allowance.

The amount identified in the "Parts Allowance Column" represents 30 % of dealer net when parts are furnished by GMC Truck. This amount is to be placed in the Net Item Amount column of the claim and use type code "M".

CAMPAIGN IDENTIFICATION LABEL

Each vehicle modified 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 ballpoint 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.

ADMINISTRATIVE PROCEDURE

Procedures covering this campaign are outlined in Section V of your dealership's "GMC Truck Claims Processing Manual" #SD8519,

Dear GMC Truck Owner:

To correct this condition, when required, your dealer will install the missing Torque Converter Clutch wiring harness and associated parts on your vehicle. Please contact your GMC Truck Dealer to arrange a service date. This service will be performed at no charge to you.

Instructions for making the correction(s) have been sent to your dealer. The labor time to perform this service is approximately 20 minutes. Please allow additional time for your dealer to process your vehicle.

The enclosed Owner Reply Card identifies your vehicle. Presentation of this card to your dealer will assist in making the inspection to your vehicle in the shortest possible time. If you have sold or traded your vehicle, please let us know by completing the postage paid Owner Identification Reply Card and returning it to us so that we may update our records. Should your dealer not schedule a service date within a reasonable time, you should contact your nearest GMC Truck Zone Office either in person or by telephone for assistance. The locations and telephone numbers of the Zone Offices are listed in your Owner's Manual.

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

Object Number: 75744 Size: FS

Object Number: 75660 Size: FS

Object Number: 75973 Size: FS

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.