CAMPAIGN: ROTARY STOP LAMP SWITCH (REPLACE SWITCH). Buick Regal 1988

SUBJECT: ROTARY STOP LAMP SWITCH

MODELS AFFECTED: 1988 BUICK REGAL

CONDITION

GENERAL MOTORS HAS DETERMINED THAT A DEFECT WHICH RELATES TO MOTOR VEHICLE SAFETY EXISTS IN CERTAIN 1988 BUICK REGAL MODEL VEHICLES. THE STOP LAMP SWITCHES ON THESE VEHICLES MAY HAVE A LOOSE ELECTRICAL CONTACT. THE LOOSE CONTACT CAN OVERHEAT AND MELT THE SURROUNDING PLASTIC CAUSING THE CONTACT TO STICK OPEN. AN OPEN CONTACT WOULD RENDER THE BRAKE LIGHTS INOPERATIVE WHEN THE BRAKE PEDAL IS DEPRESSED. ADDITIONALLY, THE TRANSMISSION CLUTCH CONTROL (TCC) AND CRUISE CONTROL (ON VEHICLES EQUIPPED WITH CRUISE CONTROL) CONTACTS WOULD REMAIN CLOSED. THIS CONDITION WOULD RESULT IN A "CRUISE RESUME" UPON BRAKE PEDAL RELEASE AT SPEEDS ABOVE 12 MILES PER HOUR WITH THE CRUISE CONTROL "ON", AND TCC ENGAGEMENT UNTIL NORMAL DROP OUT SPEED IS REACHED DURING DECELERATION. EITHER AN UNEXPECTED "CRUISE RESUME" OR INOPERATIVE BRAKE LIGHTS COULD RESULT IN A VEHICLE CRASH WITHOUT PRIOR WARNING.

DEALER ACTION

TO PREVENT THIS CONDITION FROM OCCURRING, THE ROTARY STOPLAMP SWITCH MUST BE REPLACED ON ALL INVOLVED VEHICLES.

VEHICLES INVOLVED

INVOLVED ARE CERTAIN 1988 BUICK REGAL MODEL VEHICLES PRODUCED WITHIN THE FOLLOWING VIN BREAKPOINTS:

PLANT FROM THROUGH

OSHAWA JT400064 J1410296

DEALER MATERIAL

IF YOUR DEALERSHIP HAS VEHICLES INVOLVED IN THIS CAMPAIGN, YOU WILL RECEIVE THE FOLLOWING ITEMS:

- LIST OF ALL VEHICLES INVOLVED IN THIS CAMPAIGN SHIPPED TO YOUR DEALERSHIP.

- ONE (1) CAMPAIGN IDENTIFICATION LABEL PER VEHICLE INVOLVED.

INVOLVED VEHICLES HAVE BEEN IDENTIFIED BY VEHICLE IDENTIFICATION NUMBER COMPUTER LISTINGS. COMPUTER LISTINGS CONTAIN THE COMPLETE VEHICLE IDENTIFICATION NUMBER, OWNER NAME AND ADDRESS DATA, AND ARE FURNISHED TO INVOLVED DEALERS WITH THE CAMPAIGN BULLETIN. OWNER NAME AND ADDRESS DATA FURNISHED WILL ENABLE DEALERS TO FOLLOW UP WITH OWNERS INVOLVED IN THIS CAMPAIGN.

THESE LISTINGS 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 THE FOLLOW UP NECESSARY TO COMPLETE THIS CAMPAIGN. ANY DEALER NOT RECEIVING A COMPUTER LISTING WITH THE CAMPAIGN BULLETIN HAS NO INVOLVED VEHICLES CURRENTLY ASSIGNED.

OWNER NOTIFICATION

OWNERS WILL BE NOTIFIED OF THIS CAMPAIGN ON THEIR VEHICLES BY BUICK MOTOR DIVISION.

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 CORRECTION ACCORDING TO INSTRUCTIONS CONTAINED IN THIS BULLETIN.

PARTS INFORMATION

PARTS REQUIRED TO COMPLETE THIS CAMPAIGN ARE TO BE OBTAINED FROM GENERAL MOTORS SERVICE PARTS OPERATIONS (GMSPO). TO ENSURE THESE PARTS WILL BE OBTAINED AS SOON AS POSSIBLE, THEY SHOULD BE ORDERED FROM GMSPO ON A "C.I.O." ORDER WITH NO SPECIAL INSTRUCTION CODE, BUT ON AN ADVISE CODE (2).

PART NUMBER DESCRIPTION QUANTITY/VEHICLE

10180504 STOPLAMP SWITCH ASSEMBLY 1

SERVICE PROCEDURE

NOTICE: ALL DEALERS ARE BEING SENT AN INSTRUCTIONAL VIDEO TAPE ON THE STOPLAMP SWITCH SETTING PROCEDURE IN CONNCECTION WITH BUICK PRODUCT CAMPAING 90-C-8. PLEASE BE SURE TO VIEW THIS VIDEO TAPE BEFORE PERFORMING THE PROCEDURE BELOW.

SWITCH REMOVAL - REMOVAL AND INSTALLATION.

1. REMOVE AIR CLEANER ASSEMBLY AND DISCONNECT NEGATIVE BATTERY CABLE.

2. REMOVE LEFT SIDE INSULATOR PANEL AND SLIDE STEERING SHAFT PROTECTIVE SLEEVE TOWARDS THE COWL.

3. REMOVE AIR DISTRIBUTION TUBE AND PULL DOWN.

4. REMOVE RETAINER CLIP HOLDING STOPLAMP SWITCH TO COLUMN BRACKET.

5. DISCONNECT SWITCH ARM FROM PEDAL BY PUSHING ARM OVER AND OFF BRAKE PEDAL PIN. RELEASE SWITCH BY PULLING DOWN AND RELEASEING TOP SNAP CLIP.

6. DISCONNECT CONNECTOR POSITION ASSURANCE (CPA) LOCKING PINS FROM FOUR WIRE AND TWO WIRE ELECTRICAL CONNECTORS. (TWO WIRE CONNECTOR NOT PRESENT ON VEHICLES WITHOUT CRUISE CONTROL FEATURE.)

7. DISCONNECT FOUR WIRE AND TWO WIRE CONNECTORS.

8. REMOVE BRAKE STOPLAMP SWITCH ASSEMBLY.

9. IF VEHICLE IS EQUIPPED WITH CRUISE CONTROL, CONNECT TWO WIRE CONNECTOR CPA LOCKING PIN TO NEW SWITCH ASSEMBLY.

10. INSTALL NEW SWITCH ASSEMBLY BY PUSHING SWITCH UP UNTIL SEATED INTO TOP SMAP CLIP. DO NOT ATTACH SWITCH ARM TO PIN ON BRAKE PEDAL AT THIS TIME.

NOTICE: MAKE SURE BRAKE SWITCH IS NOT ADJUSTED (METAL CLIP ON ACTUATOR IS NOT ENGAGED WITH THE SERRATIONS ON THE BOTTOM OF THE CARRIER) AS SHOWN IN FIGURE 2.

11. INSTALL RETAINER CLIP WHICH HOLDS SWITCH TO STEERING COLUMN BRACKET.

12. PUSH BRAKE PEDAL DOWN TO FLOOR PAN AND INSTALL SWITCH ARM OVER AND ONTO BRAKE PEDAL PIN.

13. PULL BRAKE PEDAL ALL THE WAY REARWARD AND LISTEN FOR SWITCH TO RATCHET TO SET POSITION. AT LEAST THREE (3) CLICKS OF THE RATCHET MUST BE HEARD.

14. CONNECT FOUR WIRE CONNECTOR AND CPA LOCKING PIN.

15. POSITION STEERING SHAFT PROTECTIVE SLEEVE.

16. RECONNECT NEGATIVE BATTERY CABLE.

17. INSPECT STOPLAMP SWITCH OPERATION. IF STOPLAMPS DO NOT OPERATE, REFER TO THE 'STOPLAMP SWITCH ADJUSTMENT' SECTION OF THIS BULLETIN. IF STOPLAMPS DO OPERATE, CONTINUE THROUGH STEP 23.

18. CHECK SETTING OF CRUISE VACUUM DUMP, IF SO EQUIPPED. WITH BRAKE PEDAL AT REST, MAKE SURE THE PLUNGER IS FULLY SEATED INTO THE BARREL. IF IT IS NOT FULLY SEATED, PUSH THE DUMP VALVE FORWARD UNTIL THE PLUNGER IS INSIDE THE BARREL AND THEN PULL REARWARD ON BRAKE PEDAL TO PROPERLY SET THE VALVE. IF THE PLUNGER IS ALREADY FULLY SEATED INTO THE BARREL, THE VACUUM DUMP VALVE IS ALREADY PROPERLY SET AND NO FURTHER ADJUSTMENT IS REQUIRED.

19. RECONNECT AIR DISTRIBUTION TUBE.

20. REINSTALL LEFT SIDE SOUND INSULATOR PANEL.

21. REINSTALL AIR CLEANER ASSEMBLY.

22. VEHICLES EQUIPPED WITH THE 2.8L ENGINE MUST HAVE THE FOLLOWING PROCEDURE PERFORMED TO 'RELEARN' THE IDLE. THIS FUNCTION MAY HAVE BEEN LOST FROM THE ECM'S MEMORY DUE TO THE LOSS OF BATTERY POWER.

A. PLACE AIR CONDITIONING CONTROLS IN 'OFF' POSITION.

B. FIRMLY APPLY PARKING BRAKE AND BLOCK DRIVE WHEELS. START ENGINE AND SHIFT TRANSAXLE INTO 'DRIVE'.

C. ALLOW ENGINE TO RUN A MAXIMUM OF 10 MINUTES OR UNTIL THE ENGINE COOLING FAN HAS CYCLED ONCE, WHICHEVER OCCURS FIRST.

D. SHIFT TRANSAXLE TO 'PARK', THEN TURN THE IGNITION KEY TO THE 'OFF' POSITION FO AT LEAST 5 SECONDS.

E. REPEAT STEP (B).

F. INSTALL CAMPAIGN IDENTIFICATION LABEL.

23. INSTALL CAMPAIGN IDENTIFICATION LABEL.

STOPLAMP SWITCH ADJUSTMENT (FIGURE 1 THROUGH 5 MAY BE HELPFUL IN PERFORMING THIS PROCEDURE).

1. DEPRESS BRAKE PEDAL AS FAR AS POSSIBLE AND HOLD.

2. USING A STIFF WIRE AND A HOOKED END (SEE FIGURES 4 AND 5), GENTLY PULL SWITCH SET LEVER FORWARD (TOWARD FRONT OF VEHICLE), AND LISTEN FOR AN AUDIBLE CLICK INDICATING RELEASE OF AUTOMATIC ADJUSTOR.

3. AFTER RELEASE OF AUTOMATIC ADJUSTOR, PULL BRAKE PEDAL ALL THE WAY REARWARD. LISTEN FOR SWITCH TO RATCHET INTO SET POSITION (SETTING THE STOPLAMP SWITCH). AT LEAST THREE (3) CLICKS OF THE RATCHET MUST BE HEARD.

4. INSPECT OPERATION OF STOPLAMPS. STOPLAMPS SHOULD OPERATE AT MAXIMUM BRAKE PEDAL TRAVEL 25 MM(1 IN.) AND THROUGHOUT THE REMAINDER OF ITS TRAVEL. IF STOPLAMPS DO NOT OPERATE PROPERLY, REPEAT SWITCH ADJUSTMENT PROCEDURE ONE MOE TIME. IF SWITCH STILL FAILS TO OPERATE PROPERLY, REFER TO THE 'STOPLAMP SWITCH ADJUSTMENT CHECK' CHART (SEE FIGURE 3).

IF STOPLAMPS DO OPERATE PROPERLY, RETURN TO STEP 17 OF THE 'STOPLAM SWITCH REMOVAL AND INSTALLATION' PROCEDURE ABOVE.

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 FIVE (5) DIGIT DEALER CODE OF THE DEALER PERFORMING THE CAMPAIGN SERVICE. THIS INFORMATION MAY BE INSERTED WITH A TYPEWRITER OR A 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.

DISPOSITION OF PARTS

REPLACED PARTS MUST BE HELD FOR DISPOSITION BY BUICK ZONE OR BRANCH CONTACT PERSONNEL. PARTS MUST HAVE A CLAIM TAG ATTACHED SHOWING THE REPAIR ORDER AND THE VIN OF THE VEHICLE FROM WHICH THEY WERE REMOVED.

WARRANTY INFORMATION

LIST ONE APPLICABLE LABOR OPERATION. A SEPARATE REPAIR ORDER MUST BE USED FOR EACH VEHICLE. A COMPLETE WARRANTY CLAIM IS TO BE KEPT AS A PERMANENT RECORD OF COMPLETION.

SUBLET PART FAILED PARTS FAILURE LABOR LABOR OTHER DEALER OP COUNT PART NO ALLOW CODE OP NO HOURS HOURS MTL TWG

- REPLACE ROTARY STOPLAMP SWITCH

1 10180504 ** 96 V4580 0.8 0.1* --

* 0.1 HOUR FOR ADMINISTRATION ** LIST CURRENT DEALER PRICE OF INSTALLED PARTS, PLUS 30%.

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.