DTC P0571 Stop Light Switch Circuit Malfunction: Description
WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.
The ECM receives the brake demand signal from the distance control ECU and transmits it to the skid control ECU.
The skid control ECU receives a signal from the ECM and operates the brake actuator.
The skid control ECU operates the brake actuator and at the same time illuminates the stop light by operating the BRK-LP relay.
DTC DETECTION CONDITION CHART
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0571 | This trouble code is output when the ECM detects the BRK-LP relay error signal from the skid control ECU for 0 2 sec or more while the dynamic cruise control is in operation |
|