P0571

DTC P0571 BRAKE SWITCH "A" CIRCUIT

CIRCUIT DESCRIPTION

DTC Detecting Condition:

When the brake pedal is depressed, the stop lamp switch sends a signal to the hybrid vehicle control ECU. Receiving the signal, the hybrid vehicle control ECU cancels the cruise control. Even if there is a malfunction in the stop lamp signal circuit while the cruise control is in operation, normal driving is maintained due to fail-safe function.
Cruise control is cancelled when positive battery voltage is applied to terminal STP.
When the brake pedal is depressed, positive voltage is applied to terminal STP of the hybrid vehicle control ECU through the STOP fuse and the stop lamp switch, and the hybrid vehicle control ECU cancels the cruise control.
When the brake pedal is released, positive voltage is applied to terminal ST1- of the hybrid vehicle control ECU through the IGN fuse and the stop lamp switch, and the hybrid vehicle control ECU operates the cruise control.

HINT: Inspect the fuses and relays before confirming the suspected areas which are shown in the table.

Wiring Diagram:

Step 1 - 2:

Step 3 - 4:

Step 5:

INSPECTION PROCEDURE