Dynamic Radar Cruise Control System

DTC P0571 Brake Switch "A" Circuit

DESCRIPTION

DTC Detection Condition:

While driving with the cruise control, if the hybrid vehicle control ECU detects that the brake pedal is depressed, the cruise control operation will be canceled. The stop light switch sends brake pedal status signals to the hybrid vehicle control ECU. When the brake pedal is not depressed, terminal ST1- is equal to the positive (+) battery voltage and terminal STP is below 1 V. When the brake pedal is depressed, the hybrid vehicle control ECU cancels cruise control operation. The hybrid vehicle control ECU outputs this DTC when the voltage of terminals ST1- and STP are both below 1 V for 0.5 seconds or more at the same time. The fail-safe function operates to enable normal driving even if there is a malfunction in the stop light signal circuit.

Wiring Diagram:

Step 1:

Step 1 (Continued)-4:

Step 4 (Continued):

INSPECTION PROCEDURE