Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Brake Switch "A" Circuit Short to Battery (P057112)

Toyota Corolla Cross (2022-2024) Service Manual / Brake / Brake Control / Dynamic Control Systems / Electronically Controlled Brake System (for Hev 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

MIL

DTC Output from

Note

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)
  • Hybrid vehicle control ECU
  • Certification ECU (smart key ECU assembly)
  • Electric brake booster (brake booster with master cylinder assembly)

Does not come on

Brake/EPB

Output ECU: Skid control ECU (brake actuator assembly)

WIRING DIAGRAM

Refer to DTC C117B62.

Click here

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • DTC precaution

    Click here

    Procedure to clear warning lights (When not clearing DTCs)

    Procedure
    1. Repair or replacement.
    2. Turn the ignition switch to ON.
    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 A151 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

A53-3 (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

Front view of wire harness connector

(to Stop Light Switch 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.

(b) Disconnect the A151 skid control ECU (brake actuator assembly) connector.

(c) Disconnect the A53 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

A53-3 (L) - Body ground

Always

Below 1.5 V
OK

REPLACE STOP LIGHT SWITCH ASSEMBLY

NG

4.

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - HYBRID VEHICLE CONTROL ECU)

*a

Front view of wire harness connector

(to Stop Light Switch 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.

(b) Disconnect the A151 skid control ECU (brake actuator assembly) connector.

(c) Disconnect the A53 stop light switch assembly connector.

(d) Disconnect the A192 hybrid vehicle control ECU 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

A53-3 (L) - Body ground

Always

Below 1.5 V
OK

REPLACE HYBRID VEHICLE CONTROL ECU

NG

5.

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY)

*a

Front view of wire harness connector

(to Stop Light Switch 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.

(b) Disconnect the A151 skid control ECU (brake actuator assembly) connector.

(c) Disconnect the A53 stop light switch assembly connector.

(d) Disconnect the A192 hybrid vehicle control ECU connector.

(e) Disconnect the A189 electric brake booster (brake booster with master cylinder 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

A53-3 (L) - Body ground

Always

Below 1.5 V
OK

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

NG

6.

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

*a

Front view of wire harness connector

(to Stop Light Switch 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.

(b) Disconnect the A151 skid control ECU (brake actuator assembly) connector.

(c) Disconnect the A53 stop light switch assembly connector.

(d) Disconnect the A192 hybrid vehicle control ECU connector.

(e) Disconnect the A189 electric brake booster (brake booster with master cylinder assembly) connector.

(f) Disconnect the I223 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

A53-3 (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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