DTC P0571-13: Brake Switch "A" Circuit Open [09/2022 - ]: 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
   A53-3 (L) - Body ground	Brake pedal depressed	11 to 14 V
   A53-3 (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 [06/2018 - ]

Result: 

OK 

See step  2

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	Front view of wire harness connector (to skid control ECU (Brake Actuator Assembly))

2. Disconnect the A51 skid control ECU (brake actuator assembly) connector.
3. Check both the connector case and the terminals for deformation and corrosion.

   OK

   No deformation or corrosion.

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A51-41 (STP) - Body ground	Brake pedal depressed	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE BRAKE ACTUATOR ASSEMBLY 

Refer to REMOVAL [09/2022 - 09/2024] , or refer to REMOVAL [09/2024 - ]

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR