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-B2:

B2-B4:

B4-B6:

B7:

Normal Operation
When the brake pedal is applied, the stoplamp switch supplies voltage to the stoplamps through circuit 511 (LG). This signal is also supplied to the PCM to indicate the brake pedal is applied. When the PCM senses the voltage from the stoplamp switch, the speed control is deactivated.

The speed control deactivator switch interrupts the power signal to the PCM through circuit 307 (BK/YE) 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 10 (LG/RD) open
- circuit 295 (LB/PK) open
- circuit 307 (BK/YE) open or short to voltage
- speed control deactivator switch
- PCM