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:

Normal Operation
The speed control deactivator switch interrupts the power signal to the powertrain control module (PCM) through circuit 636 (OG) when the brake pedal is applied firmly. 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 636 (OG) open or short to voltage
- Circuit 1119 (RD) open
- Circuit 1651 (WH/RD) open
- Stoplamp switch
- Speed control deactivator switch
- PCM