P1703

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PINPOINT TEST 2: DTC P1572 OR DTC P1703 - BRAKE SWITCH CIRCUIT FAILURE - HYBRID

Normal Operation

When the brake pedal is applied, the brake pedal position (BPP) switch closes and sends voltage to the PCM on circuit CCB08 (VT/WH) to deactivate the speed control, if engaged.The speed control deactivator switch (part of the BPP switch) receives voltage on circuit CBK02 (GN) and interrupts circuit CES09 (VT/OG) removing the voltage signal to the PCM when the brake pedal is applied firmly and passes the speed control deactivator switch point. This is a redundant signal to the PCM.The ABS module monitors brake pressure and also receives the stoplamp switch input from the smart junction box (SJB) along the high speed controller area network (HS-CAN) bus. A fault in the ABS module can disable the speed control system.

- DTC P1572 (Brake Pedal Switch Circuit) - sets when the PCM does not sense the correct sequence of the brake pedal input signal from both the stoplamp and deactivator switches when the brake pedal is pressed and released.
- DTC P1703 (Brake Switch Out Of Self Test Range) - 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
- Wiring, terminals or connectors
- Speed control deactivator switch (integral to the BPP switch)
- PCM

Diagnostic Procedure

CAUTION:Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Step 1-Step 5:

Step 6-Step 9: