Cruise Control: Description and Operation
The speed control system consists of the following:^ Speed control servo
^ Speed control actuator cable
^ Speed control actuator switch
^ Stoplight switch
^ Deactivator switch
The system operates independently of engine vacuum; therefore, no vacuum lines are required.
The speed control servo is:
^ Mounted in the engine compartment on the left shock tower.
^ Connected to the throttle linkage with the speed control actuator cable.
The electronics are integrated into the speed control servo, eliminating the need for any other speed control electronic modules in the vehicle.
CAUTION: Government safety regulations mandate the use of two sources for throttle return. Thus, the speed control actuator cable must be installed at all times.
The speed control actuator cable consists of:
^ An actuator cable which controls the throttle during speed control operation.
^ The auxiliary throttle return spring.
The speed control actuator switch assembly is mounted in the steering wheel. It consists of:
^ LH buttons (ON, OFF)
^ RH buttons (RESUME, SET ACCEL, COAST)
^ Necessary wiring.
The air bag sliding contact:
^ Is located at the center of steering wheel.
^ Transfers electrical signals from the steering column wiring to:
- Driver side air bag module.
- Horn blow switch.
- Speed control actuator switch.
The stoplight switch operates as follows:
^ It is a normally open switch that closes when the brake pedal is applied.
^ It sends an electrical signal to the speed control servo to disengage the speed control system.
^ When the brake pedal is released, the stoplight switch returns to its open position.
Deactivator switch:
^ Is a normally closed switch and replaces the speed control dump valve as a redundant safety feature in the system.
^ Is attached to the brake pedal support on one end and the brake pedal arm on the other end.
An electrical signal from the stoplight switch circuit to the speed control servo will disengage the system when the brake pedal is applied.
Under increased brake pedal efforts (22.25-44.5 N, engine running), the deactivator switch, attached to the brake pedal, will open and remove power to the speed control servo, releasing the throttle from speed control servo control.