DTC P0571-13: Brake Switch "A" Circuit Open [10/2020 - 08/2021]: Procedure

1. Check the vehicle specification.

   Result

   Result	Proceed to
   w/ Pre-collision System	A
   w/o Pre-collision System	B

Result: 

B 

See step  4

Result: 

A 

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	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
   A81-3 (L) - Body ground	Brake pedal depressed	11 to 14 V
   A81-3 (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 [03/2017 - ] 

Result: 

OK 

See step  3

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 A33 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
   A33-9 (STP) - Body ground	Brake pedal depressed	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [10/2020 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

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
   A38-2 (L) - Body ground	Brake pedal depressed	11 to 14 V
   A38-2 (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 [03/2017 - ] 

Result: 

OK 

See step  5

1. Check that the stop lights come on when the brake pedal is depressed.

   Result

   Result	Proceed to
   All stop lights illuminate when the brake pedal is depressed and turn off when the brake pedal is released.	A
   All stop lights do not illuminate when the brake pedal is depressed.	B

Result: 

B 

See step  7

Result: 

A 

See step  6

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 A33 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
   A33-9 (STP) - Body ground	Brake pedal depressed	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [10/2020 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Check that there is no open in the wire harnesses and connectors from terminal L of the stop light switch assembly to the stop lights.

   OK

   No open.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [10/2020 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR