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Home >> Toyota >> 2021 >> Mirai Limited >> Repair and Diagnosis >> Electrical >> Gauges >> Meter / Gauge System - Diagnostic Codes (2 Of 3) >> Meter / Gauge System >> DTC B1507-18: Turn Signal Light Circuit Current Below Threshold [12/2023 - ] >> Procedure

DTC B1507-18: Turn Signal Light Circuit Current Below Threshold [12/2023 - ]: Procedure

  1. INSPECT LIGHTS 
    1. Inspect the illumination of each turn signal light.

      Result

      Result Proceed to
      RH side turn signal light or LH side turn signal light does not illuminate. A
      Side turn signal light LH and rear turn signal light LH does not blink. B
      Front turn signal light LH does not blink. C
      Side turn signal light LH does not blink. D
      Rear turn signal light LH does not blink. E
      Side turn signal light RH and rear turn signal light RH does not blink. F
      Front turn signal light RH does not blink. G
      Side turn signal light RH does not blink. H
      Rear turn signal light RH does not blink. I

    Result: 

    A 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    C 

    See step  3

    Result: 

    D 

    See step  8

    Result: 

    E 

    See step  11

    Result: 

    F 

    See step  13

    Result: 

    G 

    See step  14

    Result: 

    H 

    See step  19

    Result: 

    I 

    See step  22

    Result: 

    B 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (FRONT MULTIPLEX NETWORK DOOR ECU LH - COMBINATION METER ASSEMBLY) 

    Pre-procedure1

    • Disconnect the E25 front multiplex network door ECU LH connector.
    • Disconnect the D43*1 or D200*2 combination meter assembly connector.
      1. *1: w/ Front LiDAR Sensor
      2. *2: w/o Front LiDAR Sensor
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      W/ FRONT LIDAR SENSOR

      Tester Connection Condition Specified Condition Result
      E25-20 (TRNI) - D43-22(TRNL) Always Below 1 Ω Ω
      W/O FRONT LIDAR SENSOR

      Tester Connection Condition Specified Condition Result
      E25-20 (TRNI) - D200-22(TRNL) Always Below 1 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  3. CHECK VEHICLE TYPE 
    1. Check vehicle condition.

      Result

      Result  Proceed to 
      w/ Advanced Park A
      w/o Advanced Park B

    Result: 

    B 

    See step  6

    Result: 

    A 

    See step  4

  4. INSPECT FRONT TURN SIGNAL LIGHT ASSEMBLY LH 

    Refer to INSPECTION [11/2020 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE FRONT TURN SIGNAL LIGHT ASSEMBLY LH. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (FRONT TURN SIGNAL LIGHT ASSEMBLY LH - COMBINATION METER ASSEMBLY) 

    Pre-procedure1

    • Disconnect the A91 front turn signal light assembly LH connector.
    • Disconnect the D43*1 or D200*2 combination meter assembly connector.
      1. *1: w/ Front LiDAR Sensor
      2. *2: w/o Front LiDAR Sensor
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      W/ FRONT LIDAR SENSOR

      Tester Connection Condition Specified Condition Result
      A91-1 (B) - D43-5 (LL) Always Below 1 Ω Ω
      A91-2 (E) - Body ground Always Below 1 Ω Ω
      W/O FRONT LIDAR SENSOR

      Tester Connection Condition Specified Condition Result
      A91-1 (B) - D200-5 (LL) Always Below 1 Ω Ω
      A91-2 (E) - Body ground Always Below 1 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  6. INSPECT FRONT TURN SIGNAL LIGHT LED 

    Refer to INSPECTION [11/2020 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE FRONT TURN SIGNAL LIGHT LED. Refer to  DISASSEMBLY [11/2020 - ] 

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (FRONT TURN SIGNAL LIGHT LED - COMBINATION METER ASSEMBLY) 

    Pre-procedure1

    • Disconnect the A93 front turn signal light LED connector.
    • Disconnect the D43*1 or D200*2 combination meter assembly connector.
      1. *1: w/ Front LiDAR Sensor
      2. *2: w/o Front LiDAR Sensor
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      W/ FRONT LIDAR SENSOR

      Tester Connection Condition Specified Condition Result
      A93-2 (B) - D200-5 (LL) Always Below 1 Ω Ω
      A93-1 (E) - Body ground Always Below 1 Ω Ω
      W/O FRONT LIDAR SENSOR

      Tester Connection Condition Specified Condition Result
      A93-2 (B) - D200-5 (LL) Always Below 1 Ω Ω
      A93-1 (E) - Body ground Always Below 1 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  8. CHECK HARNESS AND CONNECTOR (FRONT MULTIPLEX NETWORK DOOR ECU LH - COMBINATION METER ASSEMBLY OR BODY GROUND) 

    Pre-procedure1

    • Disconnect the E25 front multiplex network door ECU LH connector.
    • Disconnect the D43*1 or D200*2 combination meter assembly connector.
      1. *1: w/ Front LiDAR Sensor
      2. *2: w/o Front LiDAR Sensor
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      W/ FRONT LIDAR SENSOR

      Tester Connection Condition Specified Condition Result
      E25-20 (TRNI) - D43-22 (TRNL) Always Below 1 Ω Ω
      E25-1 (GND) - Body ground Always Below 1 Ω Ω
      W/ FRONT LIDAR SENSOR

      Tester Connection Condition Specified Condition Result
      E25-20 (TRNI) - D200-22 (TRNL) Always Below 1 Ω Ω
      E25-1 (GND) - Body ground Always Below 1 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  9

  9. INSPECT OUTER MIRROR RETRACTOR LH 

    Refer to INSPECTION [12/2023 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE FRONT MULTIPLEX NETWORK DOOR ECU LH. Refer to  DISASSEMBLY [12/2023 - ] 

    Result: 

    NG 

    See step  10

  10. INSPECT SIDE TURN SIGNAL LIGHT ASSEMBLY LH 

    Refer to INSPECTION [11/2020 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE OUTER MIRROR RETRACTOR LH. Refer to  DISASSEMBLY [12/2022 - ] 

    Result: 

    NG 

    REPLACE SIDE TURN SIGNAL LIGHT ASSEMBLY LH. Refer to  REMOVAL [11/2020 - ] 

  11. INSPECT REAR COMBINATION LIGHT CORD LH 

    Refer to INSPECTION [11/2020 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE REAR COMBINATION LIGHT CORD LH. Refer to  REMOVAL [11/2021 - ] 

    Result: 

    OK 

    See step  12

  12. INSPECT REAR TURN SIGNAL LIGHT LED 

    Refer to INSPECTION [11/2020 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    NG 

    REPLACE REAR TURN SIGNAL LIGHT LED. Refer to  DISASSEMBLY [11/2020 - ] 

  13. CHECK HARNESS AND CONNECTOR (FRONT MULTIPLEX NETWORK DOOR ECU RH - COMBINATION METER ASSEMBLY) 

    Pre-procedure1

    • Disconnect the E7 front multiplex network door ECU RH connector.
    • Disconnect the D43*1 or D200*2 combination meter assembly connector.
      1. *1: w/ Front LiDAR Sensor
      2. *2: w/o Front LiDAR Sensor
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      W/ FRONT LIDAR SENSOR

      Tester Connection Condition Specified Condition Result
      E7-20 (TRNI) - D43-38 (TRNR) Always Below 1 Ω Ω
      W/O FRONT LIDAR SENSOR

      Tester Connection Condition Specified Condition Result
      E7-20 (TRNI) - D200-21 (TRNR) Always Below 1 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  14. CHECK VEHICLE TYPE 
    1. Check vehicle condition.

      Result

      Result  Proceed to 
      w/ Advanced Park A
      w/o Advanced Park B

    Result: 

    B 

    See step  17

    Result: 

    A 

    See step  15

  15. INSPECT FRONT TURN SIGNAL LIGHT ASSEMBLY RH 

    Refer to INSPECTION [11/2020 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE FRONT TURN SIGNAL LIGHT ASSEMBLY RH. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    OK 

    See step  16

  16. CHECK HARNESS AND CONNECTOR (FRONT TURN SIGNAL LIGHT ASSEMBLY RH - COMBINATION METER ASSEMBLY) 

    Pre-procedure1

    • Disconnect the A90 front turn signal light assembly RH connector.
    • Disconnect the D43*1 or D200*2 combination meter assembly connector.
      1. *1: w/ Front LiDAR Sensor
      2. *2: w/o Front LiDAR Sensor
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      W/ FRONT LIDAR SENSOR

      Tester Connection Condition Specified Condition Result
      A90-1 (B) - D43-38 (TRNR) Always Below 1 Ω Ω
      A90-2 (E) - Body ground Always Below 1 Ω Ω
      W/O FRONT LIDAR SENSOR

      Tester Connection Condition Specified Condition Result
      A90-1 (B) - D200-21 (TRNR) Always Below 1 Ω Ω
      A90-2 (E) - Body ground Always Below 1 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  17. INSPECT FRONT TURN SIGNAL LIGHT LED 

    Refer to INSPECTION [11/2020 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE FRONT TURN SIGNAL LIGHT LED. Refer to  DISASSEMBLY [11/2020 - ] 

    Result: 

    OK 

    See step  18

  18. CHECK HARNESS AND CONNECTOR (FRONT TURN SIGNAL LIGHT LED - COMBINATION METER ASSEMBLY) 

    Pre-procedure1

    • Disconnect the A92 front turn signal light LED connector.
    • Disconnect the D43*1 or D200*2 combination meter assembly connector.
      1. *1: w/ Front LiDAR Sensor
      2. *2: w/o Front LiDAR Sensor
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      W/ FRONT LIDAR SENSOR

      Tester Connection Condition Specified Condition Result
      A92-2 (B) - D200-38 (TRNR) Always Below 1 Ω Ω
      A92-1 (E) - Body ground Always Below 1 Ω Ω
      W/O FRONT LIDAR SENSOR

      Tester Connection Condition Specified Condition Result
      A92-2 (B) - D200-21 (TRNR) Always Below 1 Ω Ω
      A92-1 (E) - Body ground Always Below 1 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  19. CHECK HARNESS AND CONNECTOR (FRONT MULTIPLEX NETWORK DOOR ECU RH - COMBINATION METER ASSEMBLY OR BODY GROUND) 

    Pre-procedure1

    • Disconnect the E7 front multiplex network door ECU RH connector.
    • Disconnect the D43*1 or D200*2 combination meter assembly connector.
      1. *1: w/ Front LiDAR Sensor
      2. *2: w/o Front LiDAR Sensor
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      W/ FRONT LIDAR SENSOR

      Tester Connection Condition Specified Condition Result
      E7-20 (TRNI) - D43-6 (LR) Always Below 1 Ω Ω
      E7-1 (GND) - Body ground Always Below 1 Ω Ω
      W/O FRONT LIDAR SENSOR

      Tester Connection Condition Specified Condition Result
      E7-20 (TRNI) - D200-6 (LR) Always Below 1 Ω Ω
      E7-1 (GND) - Body ground Always Below 1 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  20

  20. INSPECT OUTER MIRROR RETRACTOR RH 

    Refer to INSPECTION [12/2023 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE FRONT MULTIPLEX NETWORK DOOR ECU RH. Refer to  DISASSEMBLY [12/2023 - ] 

    Result: 

    NG 

    See step  21

  21. INSPECT SIDE TURN SIGNAL LIGHT ASSEMBLY RH 

    Refer to INSPECTION [11/2020 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE OUTER MIRROR RETRACTOR RH. Refer to  DISASSEMBLY [12/2022 - ] 

    Result: 

    NG 

    REPLACE SIDE TURN SIGNAL LIGHT ASSEMBLY RH. Refer to  REMOVAL [11/2020 - ] 

  22. INSPECT REAR COMBINATION LIGHT CORD RH 

    Refer to INSPECTION [11/2020 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE REAR COMBINATION LIGHT CORD RH. Refer to  REMOVAL [11/2021 - ] 

    Result: 

    OK 

    See step  23

  23. INSPECT REAR TURN SIGNAL LIGHT LED 

    Refer to INSPECTION [11/2020 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    NG 

    REPLACE REAR TURN SIGNAL LIGHT LED. Refer to  DISASSEMBLY [11/2020 - ] 

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