Brake Pressure Switch (BPS)

The BPS, integral to the brake pedal position (BPP) switch, is used for vehicle speed control deactivation. A normally closed switch supplies a ground signal to the PCM when the brake pedal is not applied. When the brake pedal is applied, the normally closed switch opens and the ground signal is removed from the PCM.

The normally closed BPS, along with the normally open BPP switch, are used for a brake rationality test within the PCM. The PCM misfire monitor profile learn function may be disabled if a brake switch concern occurs. If one or both brake pedal inputs to the PCM is not changing states as expected, a diagnostic trouble code (DTC) is set by the PCM strategy.