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Home >> Toyota >> 2021 >> Mirai Limited >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System - Diagnostic Codes (3 Of 4) >> Electronically Controlled Brake System >> DTC C1380-7E: Stop Lamp Relay Actuator Stuck On [12/2023 - ] >> Procedure

DTC C1380-7E: Stop Lamp Relay Actuator Stuck On [12/2023 - ]: Procedure

  1. CHECK VEHICLE 

    Result

    Result Proceed to
    w/ Front LiDAR Sensor A
    w/o Front LiDAR Sensor B

    Result: 

    B 

    See step  10

    Result: 

    A 

    See step  2

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

      Result

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

    Result: 

    B 

    See step  6

    Result: 

    A 

    See step  3

  3. CHECK BRAKE ACTUATOR ASSEMBLY 
    • Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

    Pre-procedure1

    • Disconnect the A6 No. 2 skid control ECU (brake actuator assembly) connector.
    • Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      A6-37 (STP2) - Body ground Stop light switch assembly off
      (Brake pedal released)      		 Below 1.5 V V

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    NG 

    See step  4

  4. CHECK NO. 2 SEMICONDUCTOR POWER INTEGRATION ECU 
    • Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

    Pre-procedure1

    • Disconnect the G102 No. 2 semiconductor power integration ECU connector.
    • Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      A6-37 (STP2) - Body ground Always Below 1.5 V V

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE NO. 2 SEMICONDUCTOR POWER INTEGRATION ECU. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    NG 

    See step  5

  5. CHECK FOR SHORT TO +B IN STP2 CIRCUIT 
    1. Check that there is no short to +B in the STP2 circuit (wire harnesses, connectors, stop lights and ECUs).

      OK

      No short to +B.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2020 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE MALFUNCTIONING PART 

  6. CHECK BRAKE ACTUATOR ASSEMBLY 
    • Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

    Pre-procedure1

    • Disconnect the A6 No. 2 skid control ECU (brake actuator assembly) connector.
    • Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      A6-11 (STP) - Body ground Stop light switch assembly on (Brake pedal depressed) 11 to 14 V V

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    NG 

    See step  7

  7. CHECK NO. 2 SEMICONDUCTOR POWER INTEGRATION ECU 
    • Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

    Pre-procedure1

    • Disconnect the G102 No. 2 semiconductor power integration ECU connector.
    • Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      A6-11 (STP) - Body ground Stop light switch assembly on (Brake pedal depressed) 11 to 14 V V

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE NO. 2 SEMICONDUCTOR POWER INTEGRATION ECU. Refer to  REMOVAL [12/2023 - ] 

    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.

    2. Measure the voltage according to the value(s) in the table below.
      GTY979634Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Stop Light Switch Assembly)

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      A3-2 (L) - Body ground Stop light switch assembly on (Brake pedal depressed) 11 to 14 V V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    NG 

    See step  9

  9. CHECK FOR SHORT TO GROUND IN STP CIRCUIT 
    1. Check that there is no short to ground in the STP circuit (wire harnesses, connectors and ECUs)

      OK

      There is no short to ground.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE STOP LIGHT SWITCH ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE MALFUNCTIONING PART 

  10. CHECK DTC 
    1. Check the DTCs that are output.

      Chassis > Brake/EPB > Trouble Codes 

      Result

      Result Proceed to
      Only C1380-7E is output A
      C1380-7E and other DTCs are output B

    Result: 

    B 

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS 

    Result: 

    A 

    See step  11

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

      Result

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

    Result: 

    B 

    See step  15

    Result: 

    A 

    See step  12

  12. CHECK BRAKE ACTUATOR ASSEMBLY 
    • Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

    Pre-procedure1

    • Disconnect the A6 No. 2 skid control ECU (brake actuator assembly) connector.
    • Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      A6-11 (STP) - Body ground Stop light switch assembly off
      (Brake pedal released)      		 Below 1.5 V V

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    NG 

    See step  13

  13. CHECK STOP LIGHT SWITCH ASSEMBLY 
    • Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

    Pre-procedure1

    • Disconnect the A98 stop light switch assembly connector.
    • Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      A6-11 (STP) - Body ground Always Below 1.5 V V

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE STOP LIGHT SWITCH ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    NG 

    See step  14

  14. CHECK FOR SHORT TO +B IN STP CIRCUIT 
    1. Check that there is no short to +B in the STP circuit (wire harnesses, connectors, stop lights and ECUs).

      OK

      No short to +B.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2020 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE MALFUNCTIONING PART 

  15. CHECK BRAKE ACTUATOR ASSEMBLY 
    • Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

    Pre-procedure1

    • Disconnect the A6 No. 2 skid control ECU (brake actuator assembly) connector.
    • Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      A6-37 (STP2) - Body ground Stop light switch assembly on (Brake pedal depressed) 11 to 14 V V

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    NG 

    See step  16

  16. 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.

    2. Measure the voltage according to the value(s) in the table below.
      GTY1209868Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Stop Light Switch Assembly)

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      A98-3 (L) - Body ground Stop light switch assembly on (Brake pedal depressed) 11 to 14 V V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    NG 

    See step  17

  17. CHECK FOR SHORT TO GROUND IN STP2 CIRCUIT 
    1. Check that there is no short to ground in the STP2 circuit (wire harnesses, connectors and ECUs)

      OK

      There is no short to ground.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE STOP LIGHT SWITCH ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE MALFUNCTIONING PART 

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