Service Procedure
SERVICE PROCEDURE
NOTICE:
All Dealers are being sent an instructional video tape on the Stoplamp Switch Setting Procedure in connection with Buick Product Campaign 90-C-8. Please be sure to view this video tape before performing the procedure below.
STOPLAMP SWITCH 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 releasing 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 and CPA locking pin to new switch assembly.
10. Install new switch assembly by pushing switch up until seated into top snap 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 for at least 5 seconds.
e. Repeat step (b).
f. Allow engine to run for at least 5 minutes.
23. Install Campaign Identification Label.