Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Brake Switch "A" Circuit Open (P057113)

Lexus RX (RX 350L, RX450h) 2016-2025 Repair 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

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)

WIRING DIAGRAM

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".

    Click here

PROCEDURE

1.

READ VALUE USING TECHSTREAM (STOP LIGHT SW)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Enter the following menus: Chassis / Brake/EPB / Data List.

Chassis > Brake/EPB > 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
Chassis > Brake/EPB > Data List

Tester Display

Stop Light SW

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

OK:

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

NG

GO TO STEP 4

OK

2.

CLEAR DTC

(a) Operate the Techstream to clear the codes. Enter the following menus: Chassis / Brake/EPB / Trouble Codes.

Chassis > Brake/EPB > Clear DTCs

(b) Press the DTC clear button.

(c) Turn the engine switch off.

NEXT

3.

RECONFIRM DTC

(a) Turn the engine switch on (IG).

(b) Read the DTCs following the prompts on the Techstream. Enter the following menus: Chassis / Brake/EPB / Trouble Codes.

Chassis > Brake/EPB > Trouble Codes

(c) Check if the same DTC is output.

Result

Proceed to

DTC P057113 is not output.

A

DTC P057113 is output.

B
A

USE SIMULATION METHOD TO CHECK

B

REPLACE BRAKE ACTUATOR ASSEMBLY

4.

CHECK HARNESS AND CONNECTOR (STP TERMINAL)

(a) Turn the engine switch off.

*a

Front view of wire harness connector

(to Skid Control ECU (Brake Actuator Assembly))

(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.

(c) Disconnect the A41 skid control ECU (brake actuator assembly) connector.

(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

A41-11 (STP) - Body ground

Stop light switch assembly on (Brake pedal depressed)

8 to 14 V

A41-11 (STP) - Body ground

Stop light switch assembly off (Brake pedal released)

Below 1.5 V
OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
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