Speed Control System

Speed Control System Components:

The speed control system consists of:
- Speed control servo and speed control cable assembly
- Vehicle Speed Sensor (VSS)
- horn relay and bracket
- speed control actuator switch
- Stoplight switch
- deactivator switch and brake pressure control valve assembly
- Air bag sliding contact

The system operates independently of engine vacuum, so no vacuum lines are required.

The speed control servo:
- is mounted under the LH front fender, forward of the wheel.
- connects to the throttle linkage with an integral speed control cable.
- integrates system electronics, eliminating the need for any other speed control electronic modules.





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 Vehicle Speed Sensor (VSS):
- is mounted to the transmission.
- is a magnetic pickup driven by a gear which is driven by the transmission.
- sends a signal to the speed control servo proportional to vehicle speed.

The air bag sliding contact:
- is located at the center of steering wheel.
- transfers electrical signals from the steering column wiring to the following components:
- driver side air bag module.
- horn blow switch.
- speed control actuator switch.

The stoplight switch:
- is a normally open switch that closes when the brake pedal is applied.
- sends an electrical signal to the speed control servo when closed and disengages speed control system.
- returns to its open position when the brake pedal is released.

The deactivator switch:
- is a normally closed switch.
- replaces the speed control dump valve as a redundant safety feature in the system.
- under normal conditions, when the brake pedal is applied, an electrical (brake on/off) signal from the stop lamp circuit to the speed control servo will disengage the system.
- under increased brake pedal efforts (22-44 Nm [5-10 lbs] engine running), the deactivator switch will open and remove power to the speed control servo, releasing the throttle from servo control.

Vehicles with an electronic instrument cluster have a speed control indicator above the digital speedometer

Vehicles with a conventional instrument cluster do not have a speed control indicator.