Cruise Control: Description and Operation

To operate the Speed Control System, the engine must be running and vehicle speed must be greater than 30 mph. The System is turned on by pressing the ON switch of the Speed Control Switch Assembly.

SET/ACCEL OR COAST

Pressing and releasing SET/ACCEL or COAST sends a command to hold the present speed. This speed is now the set speed. The Vehicle Speed Sensor (VSS) (at the transmission) sends signals to the Speed Control Amplifier. These signals tell the amplifier to increase or decrease the vacuum at the Servo Motor to keep the vehicle at the set speed.

Pressing and holding SET/ACCEL speeds up the car. The vehicle's speed increases as long as SET/ACCEL is depressed. Releasing SET/ACCEL gives the System a new set speed to maintain. Vehicle speed may also be increased by depressing the accelerator until the higher speed is reached, then depressing and releasing SET/ACCEL.

Pressing and holding COAST slows down the vehicle. The vehicle speed decreases as long as COAST is depressed. Releasing COAST gives the System a new set speed to maintain.


OFF

Pressing OFF turns off the System grounding the 151 LB/BK wire. The System is also turned off when the brake pedal is depressed (power through R/LG wire) or the Ignition Switch is turned OFF. The deactivator switch also operates when the brake system has pressure. This is a backup device to release the servo.

When the System has been deactivated by depressing the brake or clutch pedal, the last set speed may be resumed by pressing RESUME. This feature will not work if OFF has been depressed, or if vehicle speed is below 30 mph.