Brake Light Switch: Description and Operation

STOP LAMP SWITCH




The stop lamp switch is located under the driver side I/P touching the brake pedal. The stop lamp switch is used to turn On the stop lamps and to serve as an input to the PCM (auto only) and cruise control module (if equipped). The stop lamp switch is normally closed with the switch out of the vehicle (brake pedal depressed, plunger released). Battery voltage is supplied to the cruise control module, PCM and stop lamps through the stop lamp switch whenever the brake pedal is depressed. When the brake pedal is released, the PCM/cruise control module inputs go low and the stop lamps turn Off. The stop lamp switch is also used by the PCM as an input for transaxle downshifting and TCC operation on automatic transaxles.