DTC P0571-13: Brake Switch "A" Circuit Open [11/2021 - ]: Procedure

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

   OK

   The connector is securely connected.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Stop Light Switch Assembly)

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A37-2 (L) - Body ground	Brake pedal depressed	11 to 14 V
   A37-2 (L) - Body ground	Brake pedal released	Below 1.5 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE STOP LIGHT SWITCH ASSEMBLY. Refer to  REMOVAL [11/2021 - ] 

Result: 

OK 

See step  2

Procedure1

1. 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

2. Disconnect the A36 skid control ECU (brake actuator assembly) connector.

   Procedure2

3. Check both the connector case and the terminals for deformation and corrosion.

   OK

   No deformation or corrosion.

   Procedure3

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A36-4 (STP) - Body ground	Brake pedal depressed	11 to 14 V

   Result

   Proceed to
   OK
   NG

   Post-procedure1

5. None

Result: 

OK 

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [11/2021 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR