CUSTOM CRUISE III RESUME/ACCEL OPERATING INFORMATION

MODELS: 1983 LIGHT DUTY VEHICLES

S.O.P. 1983, AC Spark Plug Division has intro- duced Custom Cruise III. This electronic system was designed to accommodate the lower manifold vacuum levels of the more fuel efficient vehicles. Basic system operations is the same as Cruise master, however, the Resume/Accel mode may need some clarification.

When the brake pedal is momentarily depressed to disengage cruise operation, the cruise set speed is retained in the system memory. Momentarily moving the slider to the R/A (Resume/Accel) position will return the vehicle to the previously set speed.

Do not hold the slider in the R/A position ... Release it immediately.

If the slider is held in the R/A position for more than one second, the system reverts to the accel mode and will continue to accelerate. When the slider is released after one second retention, the speed to which the vehicle accelerated becomes the new cruise speed. The vehicle operator may erroneously interpret this failure to return to the previously set speed as an inoperative resume function.

In order to minimize transmission shift cycling, the electronic controller has a feature programmed into it that limits excess throttle during resume or accel modes.

On certain steep grades, such as encountered in mountainous terrain, the vehicle acceleration during the resume or acceleration mode will be reduced due to the controller action.

If the grade is sufficiently long, the cruise system may drop out, though the cruise set speed memory is retained in the controller. Drop out occurs because the vehicle has not reached "set speed" within the controller accel limits computed for normal road slope operation. This is an acceptable operating condition.

The resume and accel feature may be re-initiated with the slide switch when the road slope returns to normal.

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.