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:
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 |
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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. |
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WIRING DIAGRAM
Refer to DTC P057111.
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CAUTION / NOTICE / HINT
NOTICE:
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Procedure to clear warning lights (When not clearing DTCs) Procedure |
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PROCEDURE
1. | CHECK BRAKE PEDAL OR STOP LIGHT SWITCH ASSEMBLY INSTALLATION |
(a) Check the brake pedal height and stop light switch assembly installation.
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OK:
The brake pedal height and stop light switch assembly installation are normal.
NG | ADJUST BRAKE PEDAL OR STOP LIGHT SWITCH ASSEMBLY |
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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. |
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(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 |
---|---|---|
A80-3 (L) - Body ground | Brake pedal released | Below 1.5 V |
OK | REPLACE BRAKE ACTUATOR ASSEMBLY |
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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. |
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(b) Disconnect the A40 skid control ECU (brake actuator assembly) connector.
(c) Disconnect the A80 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 |
---|---|---|
A80-3 (L) - Body ground | Always | Below 1.5 V |
OK | REPLACE STOP LIGHT SWITCH ASSEMBLY |
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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. |
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(b) Disconnect the A40 skid control ECU (brake actuator assembly) connector.
(c) Disconnect the A80 stop light switch assembly connector.
(d) Disconnect the A25 ECM connector. (for 2GR-FKS)
(e) Disconnect the A28 ECM connector. (for A25A-FKS)
(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 |
---|---|---|
A80-3 (L) - Body ground | Always | Below 1.5 V |
OK | REPLACE ECM |
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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. |
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(b) Disconnect the A40 skid control ECU (brake actuator assembly) connector.
(c) Disconnect the A80 stop light switch assembly connector.
(d) Disconnect the A25 ECM connector. (for 2GR-FKS)
(e) Disconnect the A28 ECM connector. (for A25A-FKS)
(f) Disconnect the G25 shift lock control ECU (shift lock control unit 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 |
---|---|---|
A80-3 (L) - Body ground | Always | Below 1.5 V |
OK | REPLACE SHIFT LOCK CONTROL UNIT ASSEMBLY |
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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. |
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(b) Disconnect the A40 skid control ECU (brake actuator assembly) connector.
(c) Disconnect the A80 stop light switch assembly connector.
(d) Disconnect the A25 ECM connector. (for 2GR-FKS)
(e) Disconnect the A28 ECM connector. (for A25A-FKS)
(f) Disconnect the G25 shift lock control ECU (shift lock control unit assembly) connector.
(g) Disconnect the N9 certification ECU (smart key ECU assembly) connector.
(h) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(i) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection | Condition | Specified Condition |
---|---|---|
A80-3 (L) - Body ground | Always | Below 1.5 V |
OK | REPLACE SMART KEY ECU ASSEMBLY |
NG | REPAIR OR REPLACE HARNESS OR CONNECTOR |