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Home >> Toyota >> 2021 >> Avalon Touring >> Repair and Diagnosis >> Brakes >> Anti-Lock Brakes >> Electronically Controlled Brake System - Diagnostic Codes (C1336-P0571) (Except Hybrid) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model) >> DTC C1380-7E: Stop Lamp Relay Actuator Stuck On [08/2021 -] >> Procedure

DTC C1380-7E: Stop Lamp Relay Actuator Stuck On [08/2021 -]: Procedure

  1. CHECK STOP LIGHT ILLUMINATION STATUS 
    1. With the brake pedal released, check the illumination status of the brake lights.

      Result

      Result Proceed to
      The stop lights are illuminated. A
      The stop lights are not illuminated. B

    Result: 

    B 

    See step  7

    Result: 

    A 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (STOP LIGHT CONTROL RELAY CIRCUIT) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connector.
      GTY1026523Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Stop Light Switch Assembly)

      OK

      The connector is securely connected.

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

      Standard Voltage

      Tester Connection Condition Specified Condition
      A33-4 (ACC) - Body ground Always 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  5

    Result: 

    OK 

    See step  3

  3. CHECK STOP LIGHT ILLUMINATION STATUS 
    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.

    2. Disconnect the A33 stop light switch assembly connector.
    3. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

    4. Check the illumination status of the brake lights.

      Result

      Result Proceed to
      The stop lights are illuminated. A
      The stop lights are not illuminated. B

    Result: 

    B 

    REPLACE STOP LIGHT SWITCH ASSEMBLY. Refer to  REMOVAL [04/2018 -] 

    Result: 

    A 

    See step  4

  4. CHECK STOP LIGHT ILLUMINATION STATUS 
    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.

    2. Disconnect the A28 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the A33 stop light switch assembly connector.
    4. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

    5. Check the illumination status of the brake lights.

      Result

      Result Proceed to
      The stop lights are illuminated. A
      The stop lights are not illuminated. B

    Result: 

    A 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT CIRCUIT) 

    Result: 

    B 

    REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [08/2021 -] 

  5. CHECK HARNESS AND CONNECTOR (STOP LIGHT CONTROL RELAY CIRCUIT) 
    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.

      GTY1026523Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Stop Light Switch Assembly)
    2. Disconnect the A28 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
      A33-4 (ACC) - Body ground Always 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [08/2021 -] 

    Result: 

    NG 

    See step  6

  6. 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 connectors.

      OK

      The connector is securely connected.

    2. Disconnect the A28 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the A33 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 resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A33-4 (ACC) or A28-33 (STPO) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE STOP LIGHT SWITCH ASSEMBLY. Refer to  REMOVAL [04/2018 -] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  7. CHECK STOP LIGHT OPERATION 
    1. Check that the stop lights come on when the brake pedal is depressed.

      OK

      The stop lights illuminate.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  9

    Result: 

    OK 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (STOP LIGHT SIGNAL INPUT CIRCUIT) 
    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.

      GTY1026697Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control ECU (Brake Actuator Assembly))
    2. Disconnect the A28 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
      A28-43 (STP2) - Body ground Brake pedal depressed 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [08/2021 -] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  9. CHECK STOP LIGHT OPERATION 
    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.

    2. Disconnect the A28 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. Check that the stop lights come on when the brake pedal is depressed.

      OK

      The stop lights illuminate.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [08/2021 -] 

    Result: 

    NG 

    See step  10

  10. 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.

      GTY1026917Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Rear Combination Light Assembly LH)
    2. Disconnect the A28 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the P10 rear combination light assembly LH 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
      P10-2 (STP) - Body ground Brake pedal depressed 11 to 14 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 (rear combination light assembly) does not illuminate" of problem symptoms table.

    w/ Cornering Light: Refer to PROBLEM SYMPTOMS TABLE [08/2021 -]

    w/o Cornering Light: Refer to PROBLEM SYMPTOMS TABLE [08/2021 -]

    Result: 

    NG 

    See step  11

  11. 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.

      GTY1026916Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Rear Combination Light Assembly RH)
    2. Disconnect the A28 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the P10 rear combination light assembly LH connector.
    4. Disconnect the P9 rear combination light assembly RH 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
      P9-2 (STP) - Body ground Brake pedal depressed 11 to 14 V

      Result

      Result Proceed to
      OK A
      NG (w/ Cornering Light) B
      NG (w/o Cornering Light) C

    Result: 

    A 

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

    Refer to "Left or right stop light (rear combination light assembly) does not illuminate" of problem symptoms table.

    w/ Cornering Light: Refer to PROBLEM SYMPTOMS TABLE [08/2021 -]

    w/o Cornering Light: Refer to PROBLEM SYMPTOMS TABLE [08/2021 -]

    Result: 

    C 

    See step  16

    Result: 

    B 

    See step  12

  12. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - REAR 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.

      GTY1027049Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Rear Light Assembly LH)
    2. Disconnect the A28 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the P10 rear combination light assembly LH connector.
    4. Disconnect the P9 rear combination light assembly RH connector.
    5. Disconnect the P12 rear light assembly LH connector.
    6. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Voltage

      Tester Connection Condition Specified Condition
      P12-2 (B) - Body ground Brake pedal depressed 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

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

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

    Refer to PROBLEM SYMPTOMS TABLE [08/2021 -]

    Result: 

    NG 

    See step  13

  13. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - REAR 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.

      GTY1026639Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Rear Light Assembly RH)
    2. Disconnect the A28 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the P10 rear combination light assembly LH connector.
    4. Disconnect the P9 rear combination light assembly RH connector.
    5. Disconnect the P12 rear light assembly LH connector.
    6. Disconnect the P11 rear light assembly RH 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
      P11-2 (B) - Body ground Brake pedal depressed 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

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

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

    Refer to PROBLEM SYMPTOMS TABLE [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.

      GTY1026505Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Center Stop Light Set)
    2. Disconnect the A28 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the P10 rear combination light assembly LH connector.
    4. Disconnect the P9 rear combination light assembly RH connector.
    5. Disconnect the P12 rear light assembly LH connector.
    6. Disconnect the P11 rear light assembly RH connector.
    7. Disconnect the K41 center stop light set 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
      K41-1 (B) - Body ground Brake pedal depressed 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    GO TO LIGHTING SYSTEM (CENTER STOP LIGHT SET (STOP LIGHT CIRCUIT)) 

    Refer to "High mounted stop light does not illuminate" of problem symptoms table.

    w/ Cornering Light: Refer to PROBLEM SYMPTOMS TABLE [08/2021 -]

    w/o Cornering Light: Refer to PROBLEM SYMPTOMS TABLE [08/2021 -]

    Result: 

    NG 

    See step  15

  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.

    2. Disconnect the A28 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the A33 stop light switch assembly connector.
    4. Disconnect the P10 rear combination light assembly LH connector.
    5. Disconnect the P9 rear combination light assembly RH connector.
    6. Disconnect the P12 rear light assembly LH connector.
    7. Disconnect the P11 rear light assembly RH connector.
    8. Disconnect the K41 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 resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A33-1 (OUT) - P10-2 (STP) Always Below 1 Ω
      A33-1 (OUT) or P10-2 (STP) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE STOP LIGHT SWITCH ASSEMBLY. Refer to  REMOVAL [04/2018 -] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  16. 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.

      GTY1026505Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Center Stop Light Set)
    2. Disconnect the A28 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the P10 rear combination light assembly LH connector.
    4. Disconnect the P9 rear combination light assembly RH connector.
    5. Disconnect the K41 center stop light set connector.
    6. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Voltage

      Tester Connection Condition Specified Condition
      K41-1 (B) - Body ground Brake pedal depressed 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    GO TO LIGHTING SYSTEM (CENTER STOP LIGHT SET (STOP LIGHT CIRCUIT)) 

    Refer to "High mounted stop light does not illuminate" of problem symptoms table.

    Refer to PROBLEM SYMPTOMS TABLE [08/2021 -]

    Result: 

    NG 

    See step  17

  17. 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.

    2. Disconnect the A28 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the A33 stop light switch assembly connector.
    4. Disconnect the P10 rear combination light assembly LH connector.
    5. Disconnect the P9 rear combination light assembly RH connector.
    6. Disconnect the K41 center stop light set connector.
    7. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      A33-1 (OUT) - P10-2 (STP) Always Below 1 Ω
      A33-1 (OUT) or P10-2 (STP) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE STOP LIGHT SWITCH ASSEMBLY. Refer to  REMOVAL [04/2018 -] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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