Customer Satisfaction 00015 - Multi-Function Alarm Module Nonfunctional

On some 1998 Chevrolet and GMC C6/7 and T6/7 series medium duty trucks equipped with a diesel engine, air brakes, and the engine shutdown feature, the multi-function alarm module may not perform certain features stated in the owner's manual. These features are:

The air brake low-pressure warning is still achieved by the illumination of the Low Air warning light and the air pressure gage. An operator expecting a warning tone or telltate for low coolant of the engine to automatically shutdown when there is low coolant, high coolant temperatures, or low oil pressure may continue to drive the vehicle resulting in severe engine damage.

Dealers are to install a new circuit board in the multi-function alarm module.

Involved are certain 1998 Chevrolet and GMC C6/7 and T6/7 series medium duty trucks equipped with a diesel engine and air brakes and built within the following VIN breakpoints:

Important: Dealers should confirm vehicle eligibility through GMVIS (GM Vehicle Inquiry System) or GM Access Screen (Canada only) prior to beginning campaign repairs. [Not all vehicles within the above breakpoints may be involved.]

Involved vehicles have been identified by Vehicle Identification Number. Computer listings containing the complete Vehicle Identification Number, customer name and address data have been prepared, and are being furnished to involved dealers with the campaign bulletin. The customer name and address data furnished will enable dealers to follow up with customers involved in this campaign. Any dealer not receiving a computer listing with the campaign bulletin has no involved vehicles currently assigned.

These dealer listings may contain customer names and addresses obtained from Motor Vehicle Registration Records. The use of such motor vehicle registration data for any other purpose is a violation of law in several states/provinces/countries. Accordingly, you are urged to limit the use of this listing to the follow-up necessary to complete this campaign.

Parts required to complete this campaign are to be obtained from General Motors Service Parts Operations (GMSPO). Please refer to your "involved vehicles listing" before ordering parts. Normal orders should be placed on a DRO = Daily Replenishment Order. In an emergency situation, parts should be ordered on a CSO = Customer Special Order.

C Series Vehicles

1. Disconnect the negative battery cable.
2. Remove the left radio speaker grille and the speaker.
3. Disconnect the speaker wiring from the upper dash assembly.
4. Locate the multi-function alarm module by looking down through the speaker opening.
5. With a socket, swivel and long extension, loosen the attaching bolt approximately 5-6 turns. DO NOT REMOVE THE BOLT.
6. From under the dash, remove the push pin from the module lower attaching point.
7. Remove the cover by carefully rotating the module enough to allow the release of the module case cover locking tabs.
8. Remove the module circuit board from the case.
9. Disconnect the wiring harness and discard the circuit board.
10. Remove the new circuit board from its case. Discard the new case.
11. Install the new circuit board into the old case, making sure that the wires are routed through the slot in the case.
12. Snap the cover onto the case.
13. Plug the wiring harness connectors into the module.
14. Rotate the module into position and install the push pin retainer.

Tighten
Tighten the module retaining screw to 10 N·m (88 lb in).

15. Connect the speaker wiring to the speaker.
16. Reinstall the speaker.

Tighten
Tighten the screw to 2 N·m (18 lb in).

17. Install the speaker grille.
18. Connect the negative battery cable.
19. Install the GM Campaign Identification Label.

T Series Vehicles

1. Raise the passenger seat.
2. Disconnect the wiring from the multi-function alarm module.
3. Remove the module retaining screws and the module.
4. Install the new module and the retaining screws.

Tighten
Tighten the screws to 10 N·m (88 lb in).

5. Reconnect the wiring to the module.
6. Lower the passenger seat.
7. Install the GM Campaign Identification Label.

For US

Place a Campaign Identification Label on each vehicle corrected in accordance with the instructions outlined in this Product Campaign Bulletin. Each label provides a space to include the campaign number and 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.

Put the Campaign Identification Label on a clean and dry surface of the radiator core support in an area that will be visible to people servicing the vehicle. When installing the Campaign Identification Label, be sure to pull the tab to allow the adhesion of the clear protective covering. Additional Campaign Identification Labels for US dealers can be obtained from Dealer Support Materials by calling 1-888-549-6152 (Monday-Friday, 8:00 am to 5:00 pm EST). Ask for Item Number S-1015 when ordering.

For Canada

Place a Campaign Identification Label on each vehicle corrected in accordance with the instructions outlined in this Product Campaign Bulletin. Each label provides a space to include the campaign number and 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.

Put the Campaign Identification Label on a clean and dry surface of the radiator core support in an area that will be visible to people servicing the vehicle. Additional Campaign Identification Labels for Canadian dealers can be obtained from DGN by calling 1-800-668-5539 (Monday-Friday, 8:00 am to 5:00 pm EST). Ask for Item Number GMP91 when ordering.

Submit a Product Campaign Claim with the information indicated below.

Refer to the General Motors WINS Claim Processing Manual for details on Product Campaign Claim Submission.

Customers will be notified of this campaign on their vehicles by General Motors (see copy of customer letter included with this bulletin).

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 customers take possession of these vehicles.

Dealers are to service all vehicles subject to this campaign at no charge to customers, regardless of mileage, age of vehicle, or ownership, from this time forward.

Customers who have recently purchased vehicles sold from your vehicle inventory, and for which there is no customer information indicated on the dealer listing, are to be contacted by the dealer. Arrangements are to be made to make the required correction according to the instructions contained in this bulletin. This could be done by mailing to such customers a copy of the customer letter accompanying this bulletin. Campaign follow-up cards should not be used for this purpose, since the customer may not as yet have received the notification letter.

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

Dear Chevrolet/GMC Customer:

This notice is sent to inform you of a recall campaign that includes your vehicle.

On some 1998 Chevrolet and GMC C6/7 and T6/7 series medium duty trucks equipped with a diesel engine, air brakes, and the engine shutdown feature, the multi-function alarm module may not perform certain features stated in the owner's manual. These features are:

The air brake low-pressure warning is still achieved by the illumination of the Low Air warning light and the air pressure gage. An operator expecting a warning tone or telltate for low coolant of the engine to automatically shutdown when there is low coolant, high coolant temperatures, or low oil pressure may continue to drive the vehicle resulting in severe engine damage.

Your Chevrolet/GMC dealers will install a new circuit board in the multi-function alarm module. This service will be performed for you at no charge .

Please contact your Chevrolet/GMC dealer as soon as possible to arrange a service date and to assure parts availability. Instructions for making this correction have been sent to your dealer. Please ask your dealer if you wish to know how much time will be needed to schedule, process, and repair your vehicle.

If you experience any trouble scheduling your vehicle or you have any questions regarding this recall action, please contact the appropriate Customer Assistance/Relations Center at the number listed below:

The attached customer 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 no longer own this vehicle, please let us know by completing the card and returning it to us in the postage paid envelope.

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

Chevrolet/Pontiac-GMC Division

General Motors Corporation

Enclosure