DTC P0571: Stop Light Switch Circuit Malfunction [01/2019 - 09/2022]: Description
WARNING: This page is about a different car, the 2022 Toyota Corolla, 2021 Toyota Corolla, and 2020 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
- When the brakes are applied by the dynamic radar cruise control system, the skid control ECU (brake actuator assembly) operates the stop light switch assembly (stop light control relay) to illuminate the stop lights.
- If the ECM receives a signal from the skid control ECU (brake actuator assembly) indicating a malfunction of the stop light control relay, DTC P0571 is stored.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | DTC Output from |
|---|---|---|---|---|
| P0571 | Stop Light Switch Circuit Malfunction | When the dynamic radar cruise control system is operating, the ECM detects a signal indicating a stop light control relay malfunction from the skid control ECU (brake actuator assembly) for approximately 0.5 second or more. | Condition 1:
Condition 2:
|
Cruise Control |