Operation CHARM: Car repair manuals for everyone.

Stoplamp Switch

The stoplamp switch is under the panel, directly above the brake pedal. When you press the brake pedal, 1 set of the stoplamp switch contacts close. The closed contacts provide a voltage signal to the cruise control actuator assembly. The cruise control actuator assembly disengages the cruise control operation as soon as the voltage signal is sensed.

When you press the brake pedal, another set of stoplamp switch contacts open. The open contacts interrupts the voltage circuit from the cruise control actuator assembly to the magnetic clutch, inside the actuator. With the voltage removed from the magnetic clutch, the actuator DC servo motor disengages from the worm gear This action permits the throttle to return to the idle position. This ensures the cancellation of the cruise control operation during vehicle braking.