Stop Light Relay Malfunction

DTC P0571 STOP LIGHT RELAY MALFUNCTION

CIRCUIT DESCRIPTION

DTC Detection Condition:

The ECM receives the brake demand signal from the cruise control ECU (distance control ECU) and transmits it to the ABS & traction actuator assembly (skid control ECU). The ABS & traction actuator assembly (skid control ECU) receives a signal from the ECM and operates the brake actuator. The ABS & traction actuator assembly (skid control ECU) operates the brake actuator and illuminates the stop light by operating the BRK relay at the same time.

Wiring Diagram:

Step 1-2:

Step 3:

INSPECTION PROCEDURE