Normal Operation

When the brake pedal is pressed, the Brake Pedal Position (BPP) switch opens, this 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 is set.

This pinpoint test is intended to diagnose the following: 

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