Normal Operation

When the brake pedal is pressed, the Brake Pedal Position (BPP) switch opens and interrupts a voltage signal that is sent to the PCM. When the PCM detects this interruption, it sends a message over the High Speed Controller Area Network (HS-CAN) bus indicating that the brake pedal has been pressed. The PCM uses the BPP  switch information for the speed control system. The ABS module receives the BPP  switch information from the PCM over the HS-CAN  bus.

The BPP  is also known as the stoplamp switch.

• DTC B1483 (Brake Pedal Input Open Circuit) - The ABS module compares the BPP  message against other inputs (brake pressure and wheel speed) and if the message does not match the other inputs and there are no DTCs present for those inputs, DTC B1483 will be set.

This pinpoint test is intended to diagnose the following: 

• Wiring, terminals or connectors
• BPP  switch
• PCM
• ABS module