ELECTROMECHANICAL INSTRUMENT CLUSTER REPLACEMENT INFO

SUBJECT: ELECTROMECHANICAL INSTRUMENT CLUSTERS AND DIGITAL RATIO ADAPTER BUFFER (DRAB)-(REPLACEMENT INFORMATION)

MODELS: 1990 TOPKICK/KODIAK MEDIUM TRUCKS

The purpose of this bulletin is to announce Exchange/Repair Programs for instrument clusters and digital ratio adapter buffers used on the above listed models. These programs provide remanufactured instrument clusters in exchange for inoperative units and remanufactured ratio adapter buffers (DRAB) for inoperative units or when the rear axle ratio or tire size has been modified.

IMPORTANT: THE 1990 TOPKICK/KODIAK CLUSTERS HAVE NONREPLACEABLE GAGES AND MUST BE SERVICED USING THE PROCEDURE BELOW. DIGITAL RATIO ADAPTERS BUFFERS REQUIRE RE-PROGRAMMING AND MUST BE SERVICED USING THE PROCEDURE BELOW.

Instrument clusters are serviced by the exchange units listed in this bulletin. See pages with illustrations for part numbers and applications.

Instrument clusters are serviced by the exchange units listed in this bulletin. See pages with illustrations for part numbers and applications.

Instrument cluster and digital ratio adapter buffer exchange units are obtained by telephoning any of the twenty-eight authorized AC-Delco Service Centers listed on the last three (3) pages of this bulletin. They are shipped with memo billings, within 24 hours of the request VIA next day LTPS. The memo billings are cancelled when the inoperative instrument clusters are received by the service center from which units were obtained. If a particular unit is on back order at one of the Service Centers, it may be ordered from any of the other Service Centers.

Please adhere to the following procedure when a vehicle requires exchange service for inoperative instrument clusters:

IMPORTANT: If the odometer is reset, refer to applicable "Policies and Procedures" Manual, Section 1.10.3 Odometer Servicing. Odometer servicing labels can be procured from local office supply companies.

INSTRUMENT CLUSTER AND DRAB REPLACEMENT PROCEDURES:

1. Follow the diagnostics procedures in the Service Manuals precisely and completely. Many conditions perceived by the observer to be in the instrument cluster and DRAB are actually conditions caused by other components. Proper diagnostics will identify the source of the problem and avoid unnecessary removal and shipping of functional assemblies to service centers.

2. After diagnostics are complete and it has been determined either an exchange cluster or DRAB is required, it is necessary to determine the following:

o Determine which exchange instrument cluster is required by matching the unit to the cluster illustrations on the attached pages.

o If the odometer is part of the cluster exchange unit, notify the service center the mileage to which the cluster should be set.

o If an exchange DRAB is required, notify the service center the axle ratio and tire size.

3. Upon receiving the exchange unit from the service center, take it into the vehicle still packed in its shipping container. The container protects it from damage due to static electricity. Use care in handling the exchange unit and the inoperative cluster or DRAB. Hands must be free of dirt and grease. Avoid touching electronic components, as electro-static discharge can degrade performance or cause failure.

4. Remove the inoperative instrument cluster or DRAB and replace it with the exchange unit.

5. Include a description of the instrument cluster or DRAB problem in the "Nature of Problem" area of the ACD-1078 form. Repack the inoperative cluster in the ESD bag and place in the reusable shipping container, together with five (5) copies of the completed ACD-1078 Warranty form. Repack the inoperative DRAB in the ESD bag and place it in the original plastic box, together with five (5) copies of the completed ACD-1078 Warranty form.

6. Enclosed in the cluster reusable container is an addressed shipping label. Attach this label to the outside of the box and ship immediately to the service center from which you obtained the exchange unit. The DRAB plastic box does not include a retum shipping label. Prepare a label and ship immediately to the service center from which you obtained the exchange unit. The dealer copy of the ACD-1078 Warranty form will be returned and the memo billing cancelled upon receipt of the inoperative instrument cluster or DRAB at the service center.

7. Failure to retum the inoperative instrument cluster in its reusable container, or the DRAB in the original plastic box, can result in a container fee.

Failure to return the ACD-1078 Warranty form of the inoperative instrument cluster to the service center within thirty (30) days of the date the exchange unit was shipped, can result in a repair fee or an instrument cluster replacement fee.

Failure to return the ACD-1078 Warranty form of the inoperative DRAB to the service center within thirty (30) days of the date the exchange unit was shipped can result in a replacement fee.

The success of the Instrument Cluster and DRAB Exchange/Repair programs are dependent upon prompt retum of the inoperative parts to the service center. Your cooperation is essential to maintaining sufficient quantities of exchange stock.

INSTRUMENT AND DISPLAY SERVICE CENTERS

ARIZONA MARYLAND Jimmy's Radio-TV Corporation Caton Radio, Inc. 7882 East Gray Road 6328 Baltimore Nt. Pk. Scottsdale, AZ 85260 Catonsville, MD 21228 (602) 948-5717 (301) 747-8667 Toll Free - 1-800-528-2056 Toll Free - 1-800-443-6709 (AZ only) - Call Collect (MD only) - 1-800-443-6709

CALIFORNIA MASSACHUSETTS Auto Electric Radio Modem Radio Shop 1841 West Commonwealth 34 Broadway Fullerton, CA 92633 Wakefield, MA 01880 (714) 871-7357 (617) 246-2052 Toll Free - 1-800-321-6969 New England - 1-800-848-4001 (CA only) - 1-800-321-6970

COLORADO MICHIGAN Downtown Radio of Denver, Inc. Specmo Enterprises, Inc. 2525 West Sixth Avenue 3890 W 11 Mile Rd. Denver, CO 80204 Berkley, MI 48072 (303) 573-6288 (313) 399-7778 Toll Free - 1-800-525-3539 Toll Free - 1-800-545-7911 (CO only) - 1-800-332-3815 Toll Free - 1-800-545-7910

FLORIDA MINNESOTA Techni-Car, Inc. Auto Sound Entronix 5688 West Crenshaw Street 9600 - 54th Avenue Tampa, FL 33634 Minneapolis, MN 55442 (813) 884-0022 (612) 559-9654 Toll Free - 1-800-822-0022 Toll Free - 1-800-328-0795 (FL only) - 1-800-662-0022 (MN only) - 1-800-742-0670

GEORGIA MISSOURI Speedometer Service Company Autronics Auto Spec. 8471 Roswell Road 1450 Page Industrial Court Atlanta, GA 30350 St. Louis, MO 63132 (404) 998-1666 (314) 423-2323 Toll Free - 1-800-241-2385 Toll Free - 1-800-325-1325 (GA only) - 1-800-332-1827 (MO only) - 1-800-392-1516

ILLINOIS NEW JERSEY D & B Auto Radio, Inc. Eastern Electronics, Inc. 2140 Corporate Drive 180 Essex Street Addison, IL 60101 Hackensack, NJ 07601 (312) 916-8787 (201) 342-3945 or (201) 342-6060 Toll Free - 1-800-323-4813 Toll Free - 1-800-221-2138 (IL only) - 1-800-942-8049 (NJ only) - 1-800-221-2143

NEW YORK TENNESSEE Model Electronics, Inc. Rickwood Radio Service of 321 West Route 59 2908 Tennessee, Inc. Nanuet, NY 10954 1830 Airlane Drive (914) 623-8020 Nashville, TN 37210 Toll Free - 1-800-443-9657 (615) 889-3270 Toll Free - 1-800-423-4142 (TN only) - 1-800-423-4142

United Radio Service TEXAS 2949 Erie Boulevard East Speedometer Service, Inc. Syracuse, NY 13224 3227 Skylane Drive (315) 446-5570 Carrollton (Dallas), TX 75006 Toll Free - 1-800-448-0944 (214) 380-8944 (NY only) - 1-800-962-0901 Toll Free - 1-800-527-0108 (TX only) - 1-800-492-9026

NORTH CAROLINA Zener Electronics, Inc. Downtown Radio Service, Inc. 9434 Old Katy Road - 400 Stewart Creek Blvd. Houston, TX 77055 Charlotte, NC 28216 (713) 932-6360 (704) 391-0801 (TX only) - 1-800-992-1092 Toll Free - 1-800-537-0116 (NC only) - 1-800-522-4706

OHIO VIRGINIA Dayton Speedometer Serv., Inc. Southern Autotronics, Inc. 660 North Main Street 3300 Norfolk Street Dayton, OH 45405 Richmond, VA 23230 (513) 222-1491 (804) 353-5400 Toll Free - 1-800-543-9687 Toll Free - 1-800-446-2880 (OH only) - 1-800-543-0719 (VA only) - 1-800-572-2880

Electra Sound, Inc. 5260 Commerce Parkway West WASHINGTON Parma, OH 44130 Instrument Sales & Service, Inc. (216) 433-9600 18814 72nd Avenue South Toll Free - 1-800-262-9606 Kent, WA 98032 (OH only) - 1-800-252-4200 (206) 251-9092 (WA only) - 1-800-444-7976 PENNSYLVANIA R. T. Grim Co. 400 Regis Avenue Pittsburgh, PA 15236 (412) 655-1574 Toll Free - 1-800-222-5509 (PAonly) - 1-800-222-5509

H & R Radio Service 139 York Road Warminster, PA 18974 (215) 672-3707 Toll Free - 1-800-523-6605 (PA only) - 1-800-492-2074

CANADA SWITZE Custone Auto Radio Autometer AG 1150 Champlain Court Arsenalstrasse 51 Whitby, Ontario CH-6010 Kriens Canada L1N 6A8 Switzerland (416) 668-2664 041-414241 Canada only - 1-800-263-7867 862455 - Telex 041-418080 - Telefax G. LeBeau Limited 8288 Pie IX Boulevard Montreal, Quebec Canada HIZ 3V6 (418) 687-5447 Canada only - 1-800-363-5960

United Automotive Distributors, Ltd. 5340 Lougheed Highway Burnaby, British Columbia Canada V5B 2Z8 (604) 291-7766 Canada only -

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.