Brake Pedal Position (BPP) Switch

The BPP switch (also known as the stoplamp switch) is a dual contact switch. One set of contacts is normally open and receives voltage at all times. The other set of contacts is normally closed and is connected to ground.

When the normally open contacts close, the voltage is sent to the BCM and PCM.

When the normally closed contacts open, the ground circuit to the PCM is momentarily interrupted.