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

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

B1-B4:

B4-B6:

B7:

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

The speed control deactivator switch interrupts circuit CES09 (VT/OG), by removing the voltage signal to the PCM when the brake pedal is applied. This is a redundant signal to the PCM.

DTC P1572 - sets when the PCM does not sense the proper sequence of the brake pedal input signal from both the stoplamp and deactivator switches when the brake pedal is pressed and released.

DTC P1703 - sets when there is an open or short in the deactivator switch circuits or when there is an open or short in the stoplamp circuits.

Possible Causes
- Fuse
- Circuit CBB42 (GN) open
- Circuit CES09 (VT/OG) open or short to voltage
- Circuit CCB08 (VT/WH) open
- Speed control deactivator switch
- PCM