Test B: DTC P1703 or DTC P1572 - Brake On/Off Circuit Failure

PINPOINT TEST B: DTC P1703 OR DTC P1572 - BRAKE ON/OFF CIRCUIT FAILURE

B1-B4:

B4-B6:

B6-B8:

B8-B10:

Normal Operation
When the brake pedal is applied the smart junction box (SJB) sends a message to the PCM to deactivate the speed control if engaged.

The speed control deactivator switch interrupts circuit 535 (LB/RD) removing the voltage signal to the PCM when the brake pedal is applied firmly and passes the stoplamp switch trip point. This is a redundant signal to the PCM.

Possible Causes
- circuit 1890 (RD) open
- circuit 535 (LB/RD) open, or short to voltage
- speed control deactivator switch
- SJB
- anti-lock brake system (ABS) module
- PCM