DTC P0571-11: Brake Switch "A" Circuit Short to Ground [10/2018 - 07/2022]: Description

The skid control ECU (brake actuator assembly) receives stop light switch assembly signals and uses them to determine whether or not the brakes are applied.

When the brake pedal is depressed and no signal is received from the stop light switch assembly, this DTC is output.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
P0571-11	Brake Switch "A" Circuit Short to Ground	Either of the following is detected when the vehicle speed of 3 km/h (2 mph) or more: With the stop light switch assembly off, the stop light switch assembly is judged to be on based on the master cylinder pressure value for 3 seconds or more. With the stop light switch assembly off, the master cylinder pressure is more than 8 MPa (81.6 kgf/cm² , 1160 psi) for 3 seconds or more.	Stop light switch assembly Wire harness or connector Skid control ECU (brake actuator assembly)

DTC DETECTION CONDITIONS: C0571-11

		Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	The stop light switch assembly off and vehicle speed of 3 km/h (2 mph) or more.	◦	◦
Malfunction Status	The stop light switch assembly is judged to be on based on the master cylinder pressure value.	◦	-
Malfunction Status	The master cylinder pressure is more than 8 MPa (81.6 kgf/cm² , 1160 psi).	-	◦
Detection Time		3 seconds or more.	3 seconds or more.
Number of Trips		1 trip	1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.