DTC P0571-12: Brake Switch "A" Circuit Short to Battery [11/2021 - ]: Procedure
- CHECK BRAKE PEDAL HEIGHT AND STOP LIGHT SWITCH ASSEMBLY INSTALLATION
Refer to ADJUSTMENT [11/2021 - ]
OK
The brake pedal height and stop light switch assembly installation is normal.
Result
Proceed to OK NG Result:
NG
ADJUST BRAKE PEDAL OR STOP LIGHT SWITCH ASSEMBLY. Refer to ADJUSTMENT [11/2021 - ]
Result:
OK
See step 2
- CHECK BRAKE ACTUATOR ASSEMBLY
- 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) - Disconnect the A38 No. 2 skid control ECU (brake actuator assembly) connector.
- Check both the connector case and the terminals for deformation and corrosion.
OK
No deformation or corrosion.
- Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition A37-2 (L) - Body ground Stop light switch assembly off
(Brake pedal released)Below 1.5 V Result
Proceed to OK NG
Result:
OK
REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to REMOVAL [11/2021 - ]
Result:
NG
See step 3
- Make sure that there is no looseness at the locking part and the connecting part of the connector.
- CHECK SEMICONDUCTOR POWER INTEGRATION ECU
- 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) - Disconnect the A77 semiconductor power integration ECU connector.
- Check both the connector case and the terminals for deformation and corrosion.
OK
No deformation or corrosion.
- Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition A37-2 (L) - Body ground Stop light switch assembly off
(Brake pedal released)Below 1.5 V Result
Proceed to OK NG
Result:
OK
REPLACE SEMICONDUCTOR POWER INTEGRATION ECU. Refer to REMOVAL [11/2021 - ]
Result:
NG
See step 4
- Make sure that there is no looseness at the locking part and the connecting part of the connector.
- CHECK STOP LIGHT SWITCH ASSEMBLY
- Make sure that there is no looseness at the locking part and the connecting part of the connector.
OK
The connector is securely connected.
- Disconnect the A37 stop light switch assembly connector.
- Check both the connector case and the terminals for deformation and corrosion.
OK
No deformation or corrosion.
- Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition A37-2 (L) - Body ground Always Below 1.5 V Result
Proceed to OK NG
Result:
OK
REPLACE STOP LIGHT SWITCH ASSEMBLY. Refer to REMOVAL [11/2021 - ]
Result:
NG
See step 5
- Make sure that there is no looseness at the locking part and the connecting part of the connector.
- CHECK FOR SHORT TO +B IN STP CIRCUIT
- Check that there is no short to +B in the STP circuit (wire harnesses, connectors and ECUs).
OK
No short to +B.
Result
Proceed to OK NG
Result:
OK
USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - ]
Result:
NG
REPAIR OR REPLACE MALFUNCTIONING PART
- Check that there is no short to +B in the STP circuit (wire harnesses, connectors and ECUs).