Brake Light Switch: Description and Operation

SYSTEM OPERATION
Vehicles equipped with the speed control option use a dual function stop lamp switch. The switch is mounted in the same location as the conventional stop lamp switch, on the brake pedal mounting bracket under the instrument panel. The PCM monitors the state of the dual function stop lamp switch.

The plunger type stop lamp switch is mounted on a bracket attached to the brake pedal support. The switch can be adjusted when necessary.

CIRCUIT OPERATION
Circuit L50 from the stop lamp switch provides the brake switch input to the Controller, Anti-Lock Brakes (CAB). When the brake pedal is depressed, the stop lamp switch closes to supply battery voltage from circuit F32 to circuit L50. Circuit L50 connects to cavity 12 of the CAB. Circuit F32 originates at fuse 22 in the Power Distribution Center (PDC).

Circuit K29 provides the stop lamp switch input to the Powertrain Control Module (PCM). Circuit K29 connects to cavity C24 of the PCM. Circuit K29 also connects to the Transmission Control Module (TCM) and the shift interlock.