Toyota Yaris: Vehicle Stability Control System / Brake Switch "A" Circuit Open (P057113)

Toyota Yaris XP210 (2020-2026) Reapir and Service Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / Brake Switch "A" Circuit Open (P057113)

DESCRIPTION

The skid control ECU (brake actuator assembly) detects the brake operating conditions through a signal transmitted by the stop light switch.

The skid control ECU incorporates a circuit to detect an open circuit.

This DTC is output when an open circuit is detected in the stop light signal input line.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	DTC Output from
P057113	Brake Switch "A" Circuit Open	When the +BS terminal voltage is 9.5 V or more, an open is detected in the STP terminal circuit for 0.3 seconds or more and the stop light drive output (STPO) is off for 0.1 seconds or more.	Wire harness and connector Skid control ECU (brake actuator assembly)	Brake

WIRING DIAGRAM

Refer to DTC C13807E.

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CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.
After replacing the skid control ECU (brake actuator assembly), perform "Calibration".
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PROCEDURE

1.	READ VALUE USING GTS (STOP LIGHT SW)

(a) Operate the GTS to check the Data List.

Chassis > Brake > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Stop Light SW	Stop light switch assembly (STP terminal input)	OFF / ON	OFF: Brake pedal released ON: Brake pedal depressed	HINT: The brake pedal state is determined using the voltage at terminal STP

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Stop Light SW

Stop light switch assembly

(STP terminal input)

OFF / ON

OFF: Brake pedal released

ON: Brake pedal depressed

HINT:

The brake pedal state is determined using the voltage at terminal STP

Chassis > Brake > Data List

Tester Display
Stop Light SW

(b) Check that the stop light switch display observed on the GTS changes according to brake pedal operation.

OK:

The GTS displays OFF / ON according to brake pedal operation.

GO TO STEP 4

CLEAR DTC

(a) Operate the GTS to clear the codes.

Chassis > Brake > Clear DTCs

(b) Press the DTC clear button.

3.	RECONFIRM DTC

(a) Operate the GTS to read the DTCs.

Chassis > Brake > Trouble Codes

(b) Check if the same DTC is output.

Result	Proceed to
P057113 is not output	A
P057113 is output	B

USE SIMULATION METHOD TO CHECK

REPLACE BRAKE ACTUATOR ASSEMBLY

4.	CHECK HARNESS AND CONNECTOR (STP TERMINAL)

(a) Turn the ignition switch off.

(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

*a	Front view of wire harness connector (to Skid Control ECU (Brake Actuator Assembly))

(d) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

(e) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A108-35 (STP) - Body ground	Stop light switch assembly on (Brake pedal depressed)	8 to 14 V
A108-35 (STP) - Body ground	Stop light switch assembly off (Brake pedal released)	Below 1.5 V

REPLACE BRAKE ACTUATOR ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

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