DTC P0571-12: Brake Switch "A" Circuit Short to Battery [11/2020 - ]: Procedure
- CHECK BRAKE PEDAL HEIGHT AND STOP LIGHT SWITCH ASSEMBLY INSTALLATION
HINT:
Refer to ADJUSTMENT [11/2020 - 12/2023] , or refer to ADJUSTMENT [12/2023 - ]
Result
Proceed to OK NG Result:
NG
ADJUST BRAKE PEDAL OR STOP LIGHT SWITCH ASSEMBLY. Refer to ADJUSTMENT [11/2020 - 12/2023] , or refer to ADJUSTMENT [12/2023 - ]
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.
Pre-procedure1
- Disconnect the A6 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.
*a Component with harness connected
(Stop Light Switch Assembly)Standard Voltage
Tester Connection Condition Specified Condition Result A3-2 (L) - Body ground Brake pedal released Below 1.5 V V Result
Proceed to OK NG
Post-procedure1
- None
Result:
OK
REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to REMOVAL [11/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 12/2022] , or refer to REMOVAL [12/2022 - 12/2023] , or refer to REMOVAL [12/2023 - ]
Result:
NG
See step 3
- Make sure that there is no looseness at the locking part and the connecting part of the connector.
- CHECK NO. 2 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.
Pre-procedure1
- Disconnect the G102 No. 2 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.
*a Component with harness connected
(Stop Light Switch Assembly)Standard Voltage
Tester Connection Condition Specified Condition Result A3-2 (L) - Body ground Brake pedal released Below 1.5 V V Result
Proceed to OK NG
Post-procedure1
- None
Result:
OK
REPLACE NO. 2 SEMICONDUCTOR POWER INTEGRATION ECU. Refer to REMOVAL [11/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 12/2022] , or refer to REMOVAL [12/2022 - 12/2023] , or refer to REMOVAL [12/2023 - ]
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.
Pre-procedure1
- Disconnect the A3 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 Result A3-2 (L) - Body ground Always Below 1.5 V V Result
Proceed to OK NG
Post-procedure1
- None
Result:
OK
REPLACE STOP LIGHT SWITCH ASSEMBLY. Refer to REMOVAL [11/2020 - 12/2023] , or refer to REMOVAL [12/2023 - ]
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 [11/2020 - ]
Result:
NG
REPAIR OR REPLACE MALFUNCTIONING PART
- Check that there is no short to +B in the STP circuit (wire harnesses, connectors and ECUs).