Cruise Control - Incorrect Resume Operation
89chevy14Number: 89-212-6
Section: 6
Date: July 1989
Subject: INCORRECT CRUISE CONTROL RESUME OPERATION
Model and Year: 1987-89 PASSENGER CARS AND TRUCKS WITH CRUISE
TO: ALL CHEVROLET DEALERS
This bulletin pertains to 1987-89 passenger cars and trucks with Option K34. It 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, and on Chevrolet Y, which do not use multi-function levers.
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) or turn signal lever on Y cars.
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.
If a switch is being replaced for any other condition, switches in dealer stock may be used.
Warranty Information:
Use Labor Operation E7060 with applicable time.