DTC P0571: Stop Light Switch Circuit [08/2020 - ]: Description
When the brakes are applied by the dynamic radar cruise control system, the skid control ECU (master cylinder solenoid) operates the stop light control relay (STOP LP OPEN relay) to illuminate the stop lights.
Detection condition 1:
- If the ECM receives a signal from the skid control ECU (master cylinder solenoid) indicating a malfunction of the stop light control relay (STOP LP OPEN relay), DTC P0571 is stored.
When the brake pedal is depressed, the stop light switch assembly sends a signal to the ECM. When the ECM receives this signal, it cancels the dynamic radar cruise control.
Detection condition 2:
- When the ECM determines that terminals STP and ST1- of the stop light switch assembly are both less than 1 V, DTC P0571 is stored.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| P0571 | Brake Switch "A" Circuit | Condition1:
Condition 2:
|
Detection condition 1:
Detection condition 2:
|