Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Principles of Operation
The speed control system is designed to maintain a selected vehicle speed between 48 and 200 km/h (30 and 125 mph). The speed control module is integral to the speed control actuator.
Whenever the system is engaged and active, a speed control set indicator will be illuminated in the instrument cluster (IC).
The stoplamp switch is a double pole, double throw switch. It is normally closed to ground. When the brake pedal is applied with the speed control system engaged, the stoplamp switch opens to ground and sends voltage to the speed control actuator, putting the speed control in stand-by mode.
The speed control deactivator switch is used as a redundant signal to the speed control actuator to disable the speed control when the brake pedal is pressed firmly. The switch is normally closed, and it opens when the brake pedal is pressed firmly.
On vehicles equipped with a manual transmission, the clutch pedal position (CPP) switch is used to indicate to the speed control actuator when the clutch pedal is engaged. The switch is normally closed, and it opens when the clutch pedal is engaged.
The clockspring provides the electrical interface between the steering column wiring and the speed control switches in the steering wheel.
The inputs to the speed control actuator are the:
- Vehicle speed signal
- Speed control switches
- Stoplamp switch
- CPP switch
- Speed control deactivator switch
The outputs of the speed control actuator are the:
- Speed control indicator
- Speed control cable controlled throttle position
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.