CAMPAIGN: PUSH-PULL HEADLIGHTS SWITCH DEFECTIVE

MODELS: 1985 S/T15 ANDP25-35 MODEL LIGHT DUTY TRUCKS 1986 C/K, G-VAN, MEDIUM DUTY AND HEAVY DUTY MODEL TRUCKS

The National Traffic and Motor Vehicle Safety Act, as amended, provides that each vehicle which is subject to a recall campaign of this type must be adequately repaired within a reasonable time after the owner has tendered it for repair. A failure to adequately repair within 60 days after tender of a vehicle is prima facie evidence of failure to repair within a reasonable time.

If the condition is not adequately repaired within a reasonable time, the owner may be entitled to an identical or reasonably equivalent vehicle at no charge, or to a refund of the purchase price less a reasonable allowance for depreciation.

To avoid having to provide these burdensome solutions, every effort must be made to promptly schedule appointments with owners and to repair their vehicles as soon as possible. As you will see in reading the attached copy of the letter which is being sent to owners, the owner is being instructed to contact the nearest GMC Zone Office if the dealer does not remedy the condition within five days of the mutually agreed upon service date. If the condition is not remedied within a reasonable time, they are instructed how to contact the National Highway Traffic Safety Administration.

DEFECT INVOLVED

General Motors has determined that a defect which relates to motor vehicle safety exists in some 1985 S/TI5 and P25-35 model light duty trucks and 1986 C/K, G Van, Medium Duty and Heavy Duty model trucks.

The push-pull headlight switch might have been manufactured with electrical contacts which could potentially result in an intermittent headlight circuit. An intermittent circuit could cause the headlights to suddenly go out. Sudden loss of the headlights under severe weather or nighttime driving conditions could reduce driver visibility which might result in a vehicle crash without prior warning.

To prevent this condition dealers are required to inspect, and if necessary, replace push-pull headlight switches on suspect vehicles.

VEHICLES INVOLVED

Involved are certain 1985 S/TI5 and P25-35 model light duty trucks and 1986 C/Kl5-25-35, G15-25-35, C5-6-7, B6, P6, D9 and J8-9 model trucks equipped with push-pull type headlight switches built within the following VIN breakpoints.

Model Year Model Plant From Through ---- ----- ----- ---- ------- 1985 S/Tl5 Pontiac F0532010 F0532742 Moraine F2540848 F2542403 Shreveport F8543378 F8544409

P25-35 Detroit F3510322 F3510389

1986 C/Kl5-25-35 Flint Line#l GF705361 GF705859 Flint Line #2 GF504763 GF505140 St. Louis GS504398 GS504945 Oshawa G1505088 G1505686 Janesville GJ504719 GJ505438 In addition: 1GTEK14C5GJ505451 1GTGC24M4GJ505462 1GTGK24MOG505476 G-Van Scarborough G4503996 G4504602 Lordstown G7500418 G7500675

C5-6-7 Pontiac GV500745 GV508121 B6 Pontiac GV505686 GV508119 P6 Pontiac GV507800 GV508046 D9 Pontiac GV504851 GV505538 J8-9 Pontiac GV504835 GV505527

The specific vehicles involved in this campaign have been idenfified 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.

GMC 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.

SERVICE PROCEDURE

During servicing, each suspect push-pull headlight switch must be inspected. If the switch is not within the range of suspect date codes, it need not be replaced. See the Inspection Procedure for the inspection method and range of suspect date codes.

Disassembly and assembly procedures can be found in the following applicable Truck Service Manuals:

1985 S/Tl5 X-8529 Section 8B-16 1985 P25-35 X-8532 Section 8B-16 1986 C/K & G X-8632 Section 8B-24 1986 Medium Duty X-8433 Section 8C-4 1986 Heavy Duty X-8534 Section 8C-5

INSPECTION PROCEDURE

After removal of the Headlight Switch from the Instrument Panel, refer to the illustration to locate and identify the date code.

The four-digit date code will appear the same on any switch regardless of the model usage or part number.

If the date code is 0015 or between the range 9235 through 9305, replace the switch using the correct part number per the Parts Information section. (This represents switch manufacturing dates of September 23, 1985 through and including October 1,1985.

If the switch is not within the suspect date codes, reconnect the existing switch.

Reassemble the Headlight Switch per the applicable Service Manual instructions.

PARTS INFORMATION

Parts are to be obtained from the Warehousing & Distribution Division of General Motors (WDDGM). To ensure that these parts will be obtained as soon as possible, they should be ordered from WDDGM on a C.I.O. order with no special instruction code, but order under an advise code (2).

Part Model Number Description Quantity ---- ------ ----------- -------- S/Tl5 1995217 Headlight Switch 1 C/Kl5-25-35 1995216 Headlight Switch 1 G-Van 1995216 Headlight Switch 1 P25-35 1995216 Headlight Switch 1 C5-6-7,B6,P6, 1995194 Headlight Switch 1 J8-9,D9

WARRANTY INFORMATION

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

Labor *Time Operation Allow- Trouble Number Description ance Code ------ ----------- ---- ---- V3260 Headlamp Switch S/T 0.6 Hr. 96 Inspect Only C/K 0.3 Hr. G & P 0.4 Hr. C5-6-7, B6, 0.3 Hr. P6, D9 J8-9 0.4Hr.

V3262 Headlamp Switch S/T 0.6 Hr. 96 Inspect & Replace C/K 0.3 Hr. G & P 0.4 Hr. C5-6-7, B6, 0.3 Hr. P6, D9 J8-9 0.4Hr.

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

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 indude the five (5) digit Dealer Code of the dealer performing the campaign service. This inforrnation 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 servidng 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:

This notice is sent to you in accordance with the requirements of the National Traffic and Motor Vehicle Safety Act.

General Motors has determined that a defect which relates to motor vehicle safety exists in some 1985 S/Tl5 and P25-35 modellight duty trucks and 1986 C/K, G-Van, Medium Duty and Heavy Duty model trucks.

The push-pull headlight switch might have been manufactured with electrical contacts which allow an intermittent headlight circuit. An intermittent circuit could cause the headlights to flicker or suddenly go out. Sudden loss of the headlights under severe weather or nighttime driving conditions could reduce driver visibility which might result in a vehicle crash without prior warning.

Until you have had an opportunity to have your GMC truck corrected, you should be alert for signs of an intermittent headlight circuit. For example, you might experience flickering headlights or temporary delay when you pull the headlight switch "ON."

To prevent this condition from occurring, please contact your GMC Truck dealer on or after the date shown below to arrange a service date to have your vehicle inspected. Your dealer will check the headlight switch. If necessary, the switch will be replaced. This service will be completed at no charge to you.

Instructions have been sent to your GMC Truck dealer. It is estimated that parts will be available to your dealer on May 8, 1986. The labor time necessary to check the headlight switch and replace it if necessary, is 35 minutes. Please ask your dealer if you wish to know how much additional time will be needed to process your vehicle.

Your GMC Truck dealer is best equipped to obtain parts and provide service to ensure your vehicle is corrected as promptly as possible. However, if you take your vehicle to your dealer on the agrocd service date and they do not remedy this condition on that date or within five days, we recommend you contact your nearest GMC Truck Zone Office, either in person or by telephone. The Zone Office will assist you and your dealer in getting your vehicle corrected. The locations and telephone numbers of the Zone Offices are listed in your Owner's Manual.

After contacting your dealer and the Zone Office, if you are still not satisfied that we have done our best to remedy this condition without charge within a reasonable time, you may wish to write the Administrator, National Highway Traffic Safety Administraton, 400 Seventh Street, S.W., Washington, D. C. 20590, or call 800-424-9393 (Washington, D.C. residents use 426-0123).

The enclosed owner reply card identifies your vehicle. Presentation of this card to your dealer will assist them in making the necessary correction 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 reply card and returning it to us.

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

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.