Cruise Control - Incorrect Operation For Resume

89Chevy24

GMC NUMBER: 89-T-89


GROUP: 9 Accessories

DATE: August 1989

CORPORATE
NUMBER: 939004R
SUBJECT: INCORRECT CRUISE CONTROL RESUME OPERATION

MDELS: 1987 S/T, C/K TRUCKS, M AND G VANS 1988-89 S/T, R/V TRUCKS, M AND G VANS
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, except 1988-89 C/K Trucks which have ElectroMotor cruise system ("stepper" motor).

Condition:

When using the cruise control resume switch the cruise control may resume to a new wt 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.
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.

Warranty Information:

Labor Operation: E7060
Labor Time: .3 Hr