Power

When the master instrument panel control switch is turned on, power is supplied to the engine overspeed relay and the cruise control module.

The overspeed relay then powers the cruise control module stop contact through the brake and clutch switches. It also powers the vacuum pump and the safety solenoid.
NOTE: THE GROUND PATH FOR THE SAFETY SOLENOID AND THE INSTRUMENT CLUSTER INDICATOR IS PROVIDED BY THE CRUISE CONTROL MODULE ONLY WHEN THE VEHICLE IS MOVING FASTER THAN 48 KM/H (30 MPH), WHICH THE MODULE DETERMINES AT THE SPEED SENSOR INPUT.


The steering wheel is equipped with two switches. One switch permits acceleration and memory storage of a vehicle speed as follows:

By pressing the "SET/ACCEL" button, the voltage from the control module (5 volts) passes through a resistance of 100 ohms. As long as the pressure is applied, the vehicle accelerates. The speed is set when the button is released. The speed may also be set by pressing on the accelerator pedal and pressing the "SET/ACCEL" button the moment the desired speed is obtained.

The information is translated by the cruise control module which keeps track of two parameters:

^ Real vehicle speed as determined by the speed sensor.

^ Memory storage of the desired speed.

Continuous comparison of these two speeds permits control of the vacuum pump causing a vacuum in the diaphragm assuring vehicle speed stability (the pump has a regulation solenoid).

If regulation is interrupted (pressure on the brake or clutch pedal), press the Resume button on the steering wheel switch. The voltage from the control module (5 volts) passes through a resistance of 330 ohms. The information is translated by the control module and the vehicle automatically returns to the earlier speed stored in memory.

The other steering wheel switch interrupts speed regulation by direct grounding of the control module. The information is sent to the solenoid deceleration control terminal of the control module which turns the pump solenoid on and vents the vacuum circuit.