Brake Switch Feedback

WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

Models equipped with cruise control systems may monitor the brake light switch circuit as well as the cruise control switch, Park/Neutral Position (PNP) switch (A/T) or Cruise Control Release Switch (M/T) to determine when to engage and disengage cruise control. Upon receiving a cancel signal, the cruise control de-energizes the magnetic clutch inside the cruise control servo. With the magnetic clutch de-energized, the servo and the connecting arm are no longer mechanically connected and the throttle returns to the idle position.

The brake light switch is located under the instrument panel directly above the brake pedal. When brake pedal is pressed, one set of brake light switch contacts close and a voltage signal is provided to the cruise control module. The cruise control module disengages cruise control system operation as soon as this voltage signal is sensed. When the brake pedal is pressed, another set of brake light switch contacts open, and the voltage circuit from the cruise control module to the magnetic clutch inside the servo is interrupted. With voltage removed from the magnetic clutch, the servos DC servo motor is disengaged from the worm gear and the throttle is permitted to return to the idle position. This feature is provided to ensure the cancellation of cruise control system operation during vehicle braking.