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Home >> Toyota >> 2021 >> Camry LE, FWD >> Repair and Diagnosis >> Brakes >> Traction Control >> Vehicle Stability Control System (W/O Electric Parking Brake System) - Diagnostic Codes (3 Of 3) & Symptom Tests (Except Hybrid) >> VEHICLE STABILITY CONTROL SYSTEM (w/o Electric Parking Brake System) >> DTC P0571-12: Brake Switch "A" Circuit Short to Battery [10/2020 - 08/2021] >> Procedure

DTC P0571-12: Brake Switch "A" Circuit Short to Battery [10/2020 - 08/2021]: Procedure

  1. CHECK BRAKE PEDAL OR STOP LIGHT SWITCH ASSEMBLY INSTALLATION 
    1. Check the brake pedal height and stop light switch assembly installation.

      Refer to ADJUSTMENT [10/2020 - 08/2021]

      OK

      The brake pedal height and stop light switch assembly installation are normal.

      Result

      Result Proceed to
      OK (w/ Pre-collision System) A
      OK (w/o Pre-collision System) B
      NG C

    Result: 

    B 

    See step  7

    Result: 

    C 

    ADJUST BRAKE PEDAL OR STOP LIGHT SWITCH ASSEMBLY. Refer to  ADJUSTMENT [10/2020 - 08/2021] 

    Result: 

    A 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY OUTPUT CIRCUIT) 
    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.

      GTY978420Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Stop Light Switch 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
      A81-3 (L) - Body ground Brake pedal released Below 1.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

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

    Result: 

    NG 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BRAKE ACTUATOR ASSEMBLY) 
    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.

      GTY978101Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Stop Light Switch Assembly)
    2. Disconnect the A33 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the A81 stop light switch assembly connector.
    4. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Voltage

      Tester Connection Condition Specified Condition
      A81-3 (L) - Body ground Always Below 1.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE STOP LIGHT SWITCH ASSEMBLY. Refer to  REMOVAL [03/2017 - ] 

    Result: 

    NG 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - ECM) 
    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.

      GTY978101Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Stop Light Switch Assembly)
    2. Disconnect the A33 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the A81 stop light switch assembly connector.
    4. Disconnect the A24 ECM connector.
    5. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Voltage

      Tester Connection Condition Specified Condition
      A81-3 (L) - Body ground Always Below 1.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ECM. Refer to  REMOVAL [10/2020 - 08/2022] 

    Result: 

    NG 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - SHIFT LOCK CONTROL UNIT ASSEMBLY) 
    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.

      GTY978101Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Stop Light Switch Assembly)
    2. Disconnect the A33 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the A81 stop light switch assembly connector.
    4. Disconnect the A24 ECM connector.
    5. Disconnect the K27 shift lock control ECU (shift lock control unit assembly) connector (w/ Smart Key System).
    6. Disconnect the K28 shift lock control ECU (shift lock control unit assembly) connector (w/o Smart Key System).
    7. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Voltage

      Tester Connection Condition Specified Condition
      A81-3 (L) - Body ground Always Below 1.5 V

      Result

      Result Proceed to
      OK A
      NG (w/ Smart Key System) B
      NG (w/o Smart Key System) C

    Result: 

    A 

    REPLACE SHIFT LOCK CONTROL UNIT ASSEMBLY. Refer to  REMOVAL [03/2017 - ] 

    Result: 

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    B 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - SMART KEY ECU ASSEMBLY) 
    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.

      GTY978101Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Stop Light Switch Assembly)
    2. Disconnect the A33 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the A81 stop light switch assembly connector.
    4. Disconnect the A24 ECM connector.
    5. Disconnect the K27 shift lock control ECU (shift lock control unit assembly) connector.
    6. Disconnect the R8 certification ECU (smart key ECU assembly) connector.
    7. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Voltage

      Tester Connection Condition Specified Condition
      A81-3 (L) - Body ground Always Below 1.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE SMART KEY ECU ASSEMBLY. Refer to  REMOVAL [10/2020 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  7. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY OUTPUT CIRCUIT) 
    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.

      GTY981515Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Stop Light Switch 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
      A38-2 (L) - Body ground Brake pedal released Below 1.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

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

    Result: 

    NG 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BRAKE ACTUATOR ASSEMBLY) 
    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.

      GTY981733Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Stop Light Switch Assembly)
    2. Disconnect the A33 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the A38 stop light switch assembly connector.
    4. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Voltage

      Tester Connection Condition Specified Condition
      A38-2 (L) - Body ground Always Below 1.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE STOP LIGHT SWITCH ASSEMBLY. Refer to  REMOVAL [03/2017 - ] 

    Result: 

    NG 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - ECM) 
    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.

      GTY981733Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Stop Light Switch Assembly)
    2. Disconnect the A33 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the A38 stop light switch assembly connector.
    4. Disconnect the A24 ECM connector.
    5. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Voltage

      Tester Connection Condition Specified Condition
      A38-2 (L) - Body ground Always Below 1.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ECM. Refer to  REMOVAL [10/2020 - 08/2022] 

    Result: 

    NG 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - SHIFT LOCK CONTROL UNIT ASSEMBLY) 
    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.

      GTY981733Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Stop Light Switch Assembly)
    2. Disconnect the A33 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the A38 stop light switch assembly connector.
    4. Disconnect the A24 ECM connector.
    5. Disconnect the K27 shift lock control ECU (shift lock control unit assembly) connector (w/ Smart Key System).
    6. Disconnect the K28 shift lock control ECU (shift lock control unit assembly) connector (w/o Smart Key System).
    7. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Voltage

      Tester Connection Condition Specified Condition
      A38-2 (L) - Body ground Always Below 1.5 V

      Result

      Result Proceed to
      OK A
      NG (w/ Smart Key System) B
      NG (w/o Smart Key System) C

    Result: 

    A 

    REPLACE SHIFT LOCK CONTROL UNIT ASSEMBLY. Refer to  REMOVAL [03/2017 - ] 

    Result: 

    C 

    See step  15

    Result: 

    B 

    See step  11

  11. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - SMART KEY ECU ASSEMBLY) 
    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.

      GTY981733Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Stop Light Switch Assembly)
    2. Disconnect the A33 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the A38 stop light switch assembly connector.
    4. Disconnect the A24 ECM connector.
    5. Disconnect the K27 shift lock control ECU (shift lock control unit assembly) connector.
    6. Disconnect the R8 certification ECU (smart key ECU assembly) connector.
    7. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Voltage

      Tester Connection Condition Specified Condition
      A38-2 (L) - Body ground Always Below 1.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE SMART KEY ECU ASSEMBLY. Refer to  REMOVAL [10/2020 - ] 

    Result: 

    NG 

    See step  12

  12. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - REAR COMBINATION LIGHT ASSEMBLY LH) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

      GTY981733Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Stop Light Switch Assembly)
    2. Disconnect the A33 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the A38 stop light switch assembly connector.
    4. Disconnect the A24 ECM connector.
    5. Disconnect the K27 shift lock control ECU (shift lock control unit assembly) connector.
    6. Disconnect the R8 certification ECU (smart key ECU assembly) connector.
    7. Disconnect the W13 rear combination light assembly LH connector.
    8. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Voltage

      Tester Connection Condition Specified Condition
      A38-2 (L) - Body ground Always Below 1.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    GO TO LIGHTING SYSTEM (REAR COMBINATION LIGHT ASSEMBLY LH (STOP LIGHT CIRCUIT)) 

    Refer to "Left or right stop light does not illuminate" of problem symptoms table.

    Refer to PROBLEM SYMPTOMS TABLE [10/2020 - 08/2021]

    Result: 

    NG 

    See step  13

  13. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - REAR COMBINATION LIGHT ASSEMBLY RH) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

      GTY981733Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Stop Light Switch Assembly)
    2. Disconnect the A33 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the A38 stop light switch assembly connector.
    4. Disconnect the A24 ECM connector.
    5. Disconnect the K27 shift lock control ECU (shift lock control unit assembly) connector.
    6. Disconnect the R8 certification ECU (smart key ECU assembly) connector.
    7. Disconnect the W13 rear combination light assembly LH connector.
    8. Disconnect the W12 rear combination light assembly RH connector.
    9. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Voltage

      Tester Connection Condition Specified Condition
      A38-2 (L) - Body ground Always Below 1.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    GO TO LIGHTING SYSTEM (REAR COMBINATION LIGHT ASSEMBLY RH (STOP LIGHT CIRCUIT)) 

    Refer to "Left or right stop light does not illuminate" of problem symptoms table.

    Refer to PROBLEM SYMPTOMS TABLE [10/2020 - 08/2021]

    Result: 

    NG 

    See step  14

  14. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - CENTER STOP LIGHT SET) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

      GTY981733Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Stop Light Switch Assembly)
    2. Disconnect the A33 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the A38 stop light switch assembly connector.
    4. Disconnect the A24 ECM connector.
    5. Disconnect the K27 shift lock control ECU (shift lock control unit assembly) connector.
    6. Disconnect the R8 certification ECU (smart key ECU assembly) connector.
    7. Disconnect the W13 rear combination light assembly LH connector.
    8. Disconnect the W12 rear combination light assembly RH connector.
    9. Disconnect the R47 center stop light set connector.
    10. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Voltage

      Tester Connection Condition Specified Condition
      A38-2 (L) - Body ground Always Below 1.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE CENTER STOP LIGHT SET. Refer to  REMOVAL [03/2017 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  15. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - REAR COMBINATION LIGHT ASSEMBLY LH) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

      GTY981733Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Stop Light Switch Assembly)
    2. Disconnect the A33 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the A38 stop light switch assembly connector.
    4. Disconnect the A24 ECM connector.
    5. Disconnect the K28 shift lock control ECU (shift lock control unit assembly) connector.
    6. Disconnect the W13 rear combination light assembly LH connector.
    7. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Voltage

      Tester Connection Condition Specified Condition
      A38-2 (L) - Body ground Always Below 1.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    GO TO LIGHTING SYSTEM (REAR COMBINATION LIGHT ASSEMBLY LH (STOP LIGHT CIRCUIT)) 

    Refer to "Left or right stop light does not illuminate" of problem symptoms table.

    Refer to PROBLEM SYMPTOMS TABLE [10/2020 - 08/2021]

    Result: 

    NG 

    See step  16

  16. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - REAR COMBINATION LIGHT ASSEMBLY RH) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

      GTY981733Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Stop Light Switch Assembly)
    2. Disconnect the A33 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the A38 stop light switch assembly connector.
    4. Disconnect the A24 ECM connector.
    5. Disconnect the K28 shift lock control ECU (shift lock control unit assembly) connector.
    6. Disconnect the W13 rear combination light assembly LH connector.
    7. Disconnect the W12 rear combination light assembly RH connector.
    8. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Voltage

      Tester Connection Condition Specified Condition
      A38-2 (L) - Body ground Always Below 1.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    GO TO LIGHTING SYSTEM (REAR COMBINATION LIGHT ASSEMBLY RH (STOP LIGHT CIRCUIT)) 

    Refer to "Left or right stop light does not illuminate" of problem symptoms table.

    Refer to PROBLEM SYMPTOMS TABLE [10/2020 - 08/2021]

    Result: 

    NG 

    See step  17

  17. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - CENTER STOP LIGHT SET) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

      GTY981733Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Stop Light Switch Assembly)
    2. Disconnect the A33 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the A38 stop light switch assembly connector.
    4. Disconnect the A24 ECM connector.
    5. Disconnect the K28 shift lock control ECU (shift lock control unit assembly) connector.
    6. Disconnect the W13 rear combination light assembly LH connector.
    7. Disconnect the W12 rear combination light assembly RH connector.
    8. Disconnect the R47 center stop light set connector.
    9. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Voltage

      Tester Connection Condition Specified Condition
      A38-2 (L) - Body ground Always Below 1.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE CENTER STOP LIGHT SET. Refer to  REMOVAL [03/2017 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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