Lexus ES manuals

Lexus ES: Brake Switch "A" Circuit Short to Battery (P057112)

Lexus ES (XZ10) Service Manual / Brake / Brake Control / Dynamic Control Systems / Electronically Controlled Brake System (for Gasoline Model) / Brake Switch "A" Circuit Short to Battery (P057112)

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.

DTCs may be stored if either of the following occurs:

  • Stop light switch assembly stuck on malfunction.
  • The accelerator and brake pedals are depressed simultaneously.*

HINT:

*: The skid control ECU (brake actuator assembly) may store this DTC upon judging that a stuck on malfunction has occurred when the accelerator pedal and brake pedal are depressed simultaneously. However, this does not indicate a malfunction.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

P057112

Brake Switch "A" Circuit Short to Battery

The vehicle speed is 10 km/h (6 mph) or more, the accelerator pedal is depressed, the master cylinder pressure is 0.5 MPa (5.1 kgf/cm2, 72.5 psi) or less, and the stop light switch assembly is on for 60 seconds or more.
  • Stop light switch assembly
  • Stop light switch assembly installation
  • Wire harness or connector
  • Skid control ECU (brake actuator assembly)
  • ECM
  • Shift lock control ECU (shift lock control unit assembly)
  • Certification ECU (smart key ECU assembly)

WIRING DIAGRAM

Refer to DTC P057111.

Click here

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 acceleration sensor zero point calibration and store system information memorization.

    Click here

  • DTC precaution

    Click here

    Procedure to clear warning lights (When not clearing DTCs)

    Procedure
    1. Repair or replacement.
    2. Turn the engine switch on (IG).
    3. Drive the vehicle and depress the brake pedal 2 or 3 times to clear the warning lights.

PROCEDURE

1.

CHECK BRAKE PEDAL OR STOP LIGHT SWITCH ASSEMBLY INSTALLATION

(a) Check the brake pedal height and stop light switch assembly installation.

Click here

OK:

The brake pedal height and stop light switch assembly installation are normal.

NG

ADJUST BRAKE PEDAL OR STOP LIGHT SWITCH ASSEMBLY

OK

2.

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY OUTPUT CIRCUIT)

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

OK:

The connector is securely connected.

*a

Component with harness connected

(Stop Light Switch Assembly)

(b) Disconnect the A40 skid control ECU (brake actuator assembly) connector.

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

OK:

No deformation or corrosion.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A43-3 (L) - Body ground

Brake pedal released

Below 1.5 V
OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

3.

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BRAKE ACTUATOR ASSEMBLY)

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

OK:

The connector is securely connected.

*a

Front view of wire harness connector

(to Stop Light Switch Assembly)

(b) Disconnect the A40 skid control ECU (brake actuator assembly) connector.

(c) Disconnect the A43 stop light switch 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

A43-3 (L) - Body ground

Always

Below 1.5 V
OK

REPLACE STOP LIGHT SWITCH ASSEMBLY

NG

4.

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - ECM)

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

OK:

The connector is securely connected.

*a

Front view of wire harness connector

(to Stop Light Switch Assembly)

(b) Disconnect the A40 skid control ECU (brake actuator assembly) connector.

(c) Disconnect the A43 stop light switch assembly connector.

(d) Disconnect the A25 ECM connector.

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

OK:

No deformation or corrosion.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A43-3 (L) - Body ground

Always

Below 1.5 V
OK

REPLACE ECM

NG

5.

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - SHIFT LOCK CONTROL UNIT ASSEMBLY)

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

OK:

The connector is securely connected.

*a

Front view of wire harness connector

(to Stop Light Switch Assembly)

(b) Disconnect the A40 skid control ECU (brake actuator assembly) connector.

(c) Disconnect the A43 stop light switch assembly connector.

(d) Disconnect the A25 ECM connector.

(e) Disconnect the G25 shift lock control ECU (shift lock control unit assembly) connector.

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

OK:

No deformation or corrosion.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A43-3 (L) - Body ground

Always

Below 1.5 V
OK

REPLACE SHIFT LOCK CONTROL UNIT ASSEMBLY

NG

6.

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - SMART KEY ECU ASSEMBLY)

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

OK:

The connector is securely connected.

*a

Front view of wire harness connector

(to Stop Light Switch Assembly)

(b) Disconnect the A40 skid control ECU (brake actuator assembly) connector.

(c) Disconnect the A43 stop light switch assembly connector.

(d) Disconnect the A25 ECM connector.

(e) Disconnect the G25 shift lock control ECU (shift lock control unit assembly) connector.

(f) Disconnect the N9 certification ECU (smart key ECU assembly) connector.

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

OK:

No deformation or corrosion.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A43-3 (L) - Body ground

Always

Below 1.5 V
OK

REPLACE SMART KEY ECU ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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