Cruise Control - Incorrect Resume Operation
89buick09Bulletin 89-8-19
Date July, '89
Ref. No. 89-181-8
Corp. Ref. No. 939004
SUBJECT: INCORRECT CRUISE CONTROL RESUME OPERATION
MODELS AFFECTED: 1987-89 SKYHAWK 1987-89 CENTURY 1987-89 REGAL 1987-89 LESABRE 1987-89 ELECTRA/PARK AVENUE
This bulletin will help in diagnosing an intermittent condition which may otherwise be difficult to correct. This condition occurs only on vehicles using a "Multi-function" lever, with turn signal, beam change, wash/wipe, and cruise control functions.
Condition
When using the cruise control resume switch the cruise control may resume to a new set speed that is different from the original set speed. If the new set speed is well below the original speed, this could also be reported as inoperative resume. The brake switch and the on/off switch still function properly to disengage the cruise control system. Another condition is that the resume/accel function may be totally inoperative, but the set/coast switch will still work.
These conditions usually occur with some accumulated mileage, depending on how often the cruise control system is used.
Cause
An intermittent condition in the turn signal lever switch causes the cruise control system to set a new speed when the slider is moved to resume. The intermittent condition is so short that it cannot be detected by normal methods, and the switch will test good.
Correction
Replace the switch (Multi-Function Lever).
Parts Information
All parts in stock at GMSPO have been replaced with new part numbers. If replacing a switch for this condition, do not use parts in dealer stock. All new orders will automatically receive the new part numbers.