CAMPAIGN: SPEEDO ADAPTER CALIB INCORRECT (INSTALL DRAC)

SUBJECT: INCORRECTLY CALIBRATED SPEEDOMETER ADAPTER

MODELS: 1992 TOPKICK/KODIAK

General Motors has determined that a small number of 1992 TopKick/Kodiak medium duty vehicles equipped with certain Michelin radial rear tire com- binations were shipped with incorrectly calibrated speedometer adapters. This would cause the odometer and speedometer to register from 8.4% to 9.2% high.

To correct this condition, dealers will install a recalibrated Digital Ratio Adapter Controller (DRAC) and reset the odometer to the correct mileage.

VEHICLES INVOLVED

Involved are the following 1992 TopKick/Kodiak medium duty vehicles:

1GBJ6H1J6NJ100053 1GBL7H1P6NJ100385 1GBM7H1J2NJ100433 1GBL6H1J1NJ100499 1GBL7H1P6NJ100653 1GBL7H1P8NJ100663 1GBL7H1PXNJ100678 1GBL7H1PONJ100687 1GBL7H1P7NJ100704 1GBL7H1J8NJ100738 1GBL7H1J9NJ100747 1GBL7H1PONJ100754 1GBJ7H1J5NJ100817 1GBL7H1P9NJ101028 1GBM7H1JlNJ101122 1GDL6H1P2NJ500082 1GDM7H1J3NJ500234 1GDM7H1J6NJ500521 1GDL7H1JXNJ500601 1GDL7H1J8NJ500760 1GDM7H1J2NJ501438

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

All unsold new vehicles in dealers' possession and subject to this campaign MUST be held and inspected/repaired per the service procedure of this campaign bulletin BEFORE owners take possession of these vehicles.

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.

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

In summary, whenever a vehicle subject to this campaign enters your vehicle inventory, or is in your dealership for service in the future, please take the steps necessary to be sure the campaign correction has been made before selling or releasing the vehicle.

If the name and address of the owner of an involved vehicle was unavailable to GMC Truck Division at the time of campaign initiation, the dealer must 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.

GMC Truck Division General Motors Corporation 101 Union Street Plymouth, Michigan 48170

OWNER NOTIFICATION

Owners will be notified of this campaign on their vehicles by GMC Truck Division (see copy of owner lefter 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.

SERVICE PROCEDURE

NOTE: The Delco Exchange Program must be utilized for the replacement DRAC. This program may also be used for the odometer section of this bulletin but it is not necessary.

TO REPLACE THE DRAC MODULE

1. Disconnect the negative battery cable.

2. Disconnect the electrical connector which is connected to the door jamb switch.

3. Remove the door jamb switch and fastener.

4. Remove the fuse block access cover.

5. Remove the fuse block by releasing its retaining clip and sliding the fuse block off its locators.

6. Remove the bolt (Figure 2, View A) from the Digital Ratio Adapter Controller (DRAC). The DRAC is located under the dash along the left side of the cab (Figure 2).

7. Remove the retainer (Figure 2, View A).

8. Remove the alarm module (Figure 2, View A) through the opening in the instrument panel. Wiring connectors (Figure 2, View A) must be disconnected before alarm module can be completely removed.

9. Remove the two retainers (Figure 2, View A).

10. Disconnect the electrical connector (Figure 2, View A).

11. Remove the DRAC (Figure 2, View A).

12. Install the replacement DRAC (Figure 2, View A) using the retainers (Figure 2, View A).

13. Connect the electrical connector (Figure 2, View A) to the DRAC (Figure 2, View A).

14. Reinstall the alarm module electrical connectors (Figure 2, View A). Fastening the DRAC with the retainer and the bolt (Figure 2, View A). Torque the bolt to 7.0 - 8.0 lbs. ft. (10 N-m ).

15. Position the fuse block in its opening, align the locators, and install the retainer clip. Make sure the retaining clip is fully engaged.

16. Install the fuse block access cover.

17. Install the door jamb switch and its electrical connector.

18. Connect the negative battery cable.

TO CORRECT THE VEHICLE'S MILEAGE --------------------------------

1. Note the vehicle mileage as read on the vehicle odometer.

2. Locate the vehicle's VIN number in Figure 1 and note the correction factor.

3. Multiply the mileage noted in Step 1 by the correction factor noted in Step 2. The result is the vehicle's true actual mileage. This is the mileage the vehicle odometer will read when it is returned to the customer.

4. Remove the instrument cluster. Refer to the TopKick/Kodiak Service Manual (X-9233) section 8C "INSTRUMENT CLUSTER REPLACEMENT" OR GMC Truck Service Bulletin 92-8C-53(A) published April 1992, section "INSTRUMENT CLUSTER R&R or REPLACEMENT"

5. Remove the odometer and set the mileage to the amount calculated in step 3 above. Refer to GMC Truck Service Bulletin 92-8C-53(A) published April 1992, section "ODOMETER MODULE SERVICING".

WARNING: IT IS AGAINST THE LAW AND GM POLICY TO SET A REPLACEMENT OR SERVICED ODOMETER TO ANY MILEAGE OTHER THAN ZERO OR THE ACTUAL VEHICLE MILEAGE (CALCULATED IN STEP 3)

6. Install the odometer module as outlined in GMC Truck Service Bulletin 92-8C-53(A) published April 1992, section "ODOMETER MODULE SERVICING".

7. Install the instrument cluster as outlined in the TopKick/Kodiak Service Manual (X-9233) section 8C "INSTRUMENT CLUSTER REPLACEMENT" OR GMC Truck Service Bulletin 92-8C-53(A) published April 1992, section "INSTRUMENT CLUSTER R&R or REPLACEMENT"

8. Install "Campaign Identification Label".

PARTS INFORMATION

The Delco Exchange Program (Refer to GMC Truck Service Bulletin 91-0A-131 for your Delco Exchange Service Center) must be utilized to acquire a replacement DRAC. To procure the correct replacement DRAC, the rear tire size and the the rear axle ratio must be supplied to the Exchange Service Center. This program may also be used for the instrument cluster, instead of resetting the odometer, but it is not required.

WARRANTY INFORMATION

Dealers should submit a warranty claim on each vehicle completed under this campaign.

Labor Operation *Time Trouble Number Description Allowance Code --------- ----------- --------- -------- V7520 Replace DRAC and 1.2 hrs. 96 Reset Odometer

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

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 campaign number and five (5) digit dealer code of the dealer performing the campaign service. This information may be inserted with a typewriter or 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.

ADMINISTRATIVE PROCEDURE

Procedures covering this campaign are outlined in Section V of your dealership's "GM Truck Claims Processing Manual" #P9119.

Dear GM Truck Owner:

Our records show that you own one of our new 1992 model General Motors TopKick/Kodiak medium duty trucks. The rate at which these trucks have been accepted into the stream of commerce has been very gratifying to us. In addition, feedback from customers, dealers and our own tracking systems indicate a very high degree of product reliability thus far.

We have recently become aware of a situation on certain 1992 TopKick/Kodiaks equipped with specific Michelin radial rear tire combinations shipped with incorrectly calibrated speedometer adapters. This would cause the odometer and speedometer to register from 8.4% to 9.2% high. To correct this condition, dealers will install a recalibrated Digital Ratio Adapter Controller (DRAC) and reset the odometer to the correct mileage. This service will be completed for you at no charge.

Instructions for performing this service have been sent to your GM TopKick/Kodiak dealer. Please contact your GM TopKick/Kodiak dealer to arrange a service date. Refer to your GM TopKick/Kodiak Servicing Dealers booklet for the dealer nearest you. The labor time necessary to perform this correction is approximately one and one half hours. Please ask your dealer how much additional time will be needed to process your vehicle.

The enclosed postage paid owner reply card identifies your vehicle. Presentation of this card to your GM TopKick/Kodiak dealer will assist in making the necessary correction to your vehicle in the shortest possible time. If you have sold or traded your vehicle, please furnish us complete name and address of the person you sold or traded your vehicle to and retum the card to us.

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

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.