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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 B1508-19: Turn Signal/Hazard Flasher Circuit Current Above Threshold [12/2023 - ] >> Procedure

DTC B1508-19: Turn Signal/Hazard Flasher Circuit Current Above Threshold [12/2023 - ]: Procedure

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

      Result

      Result Proceed to
      Front turn signal light LH does not blink. A
      Front turn signal light RH does not blink. B
      Side turn signal light LH and rear turn signal light LH does not blink. C
      Side turn signal light RH and rear turn signal light RH does not blink. D

    Result: 

    B 

    See step  12

    Result: 

    C 

    See step  20

    Result: 

    D 

    See step  30

    Result: 

    A 

    See step  2

  2. CLEAR DTC 
    1. Clear the DTC.

      Body Electrical > Combination Meter > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  3

  3. CHECK VEHICLE TYPE 
    1. Check vehicle condition.

      Result

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

    Result: 

    B 

    See step  5

    Result: 

    A 

    See step  4

  4. CHECK HAZARD WARNING SIGNAL SWITCH ASSEMBLY 

    Pre-procedure1

    • Disconnect the D101 hazard warning signal switch assembly connector.
    • Check for DTC.

      Body Electrical > Combination Meter > Trouble Codes 

      Result

      Result Proceed to
      B1508-19 is output A
      B1507-18 is output B

    Post-procedure1

    • None

    Result: 

    B 

    REPLACE HAZARD WARNING SIGNAL SWITCH ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    A 

    See step  5

  5. CHECK VEHICLE TYPE 
    1. Check vehicle condition.

      Result

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

    Result: 

    B 

    See step  9

    Result: 

    A 

    See step  6

  6. CHECK FRONT TURN SIGNAL LIGHT LED 

    Pre-procedure1

    • Disconnect the A93 front turn signal light LED connector.
    • Check for DTC.

      Body Electrical > Combination Meter > Trouble Codes 

      Result

      Result Proceed to
      B1508-19 is output A
      B1507-18 is output B

    Post-procedure1

    • None

    Result: 

    B 

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

    Result: 

    A 

    See step  7

  7. CLEAR DTC 
    1. Clear the DTC.

      Body Electrical > Combination Meter > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BODY GROUND) 

    Pre-procedure1

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

      Standard Resistance

      W/ FRONT LIDAR SENSOR

      Tester Connection Condition Specified Condition Result
      D43-5 (LL) - Body ground Always 10 kΩ or higher kΩ
      W/O FRONT LIDAR SENSOR

      Tester Connection Condition Specified Condition Result
      D200-5 (LL) - Body ground Always 10 kΩ or higher kΩ

      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 

  9. CHECK FRONT TURN SIGNAL LIGHT ASSEMBLY LH 

    Pre-procedure1

    • Disconnect the A91 front turn signal light assembly LH connector.
    • Check for DTC.

      Body Electrical > Combination Meter > Trouble Codes 

      Result

      Result Proceed to
      B1508-19 is output A
      B1507-18 is output B

    Post-procedure1

    • None

    Result: 

    B 

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

    Result: 

    A 

    See step  10

  10. CLEAR DTC 
    1. Clear the DTC.

      Body Electrical > Combination Meter > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  11

  11. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BODY GROUND) 

    Pre-procedure1

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

      Standard Resistance

      W/ FRONT LIDAR SENSOR

      Tester Connection Condition Specified Condition Result
      D43-5 (LL) - Body ground Always 10 kΩ or higher kΩ
      W/O FRONT LIDAR SENSOR

      Tester Connection Condition Specified Condition Result
      D200-5 (LL) - Body ground Always 10 kΩ or higher kΩ

      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 

  12. CLEAR DTC 
    1. Clear the DTC.

      Body Electrical > Combination Meter > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  13

  13. CHECK VEHICLE TYPE 
    1. Check vehicle condition.

      Result

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

    Result: 

    B 

    See step  17

    Result: 

    A 

    See step  14

  14. CHECK FRONT TURN SIGNAL LIGHT LED 

    Pre-procedure1

    • Disconnect the A92 front turn signal light LED connector.
    • Check for DTC.

      Body Electrical > Combination Meter > Trouble Codes 

      Result

      Result Proceed to
      B1508-19 is output A
      B1507-18 is output B

    Post-procedure1

    • None

    Result: 

    B 

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

    Result: 

    A 

    See step  15

  15. CLEAR DTC 
    1. Clear the DTC.

      Body Electrical > Combination Meter > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  16

  16. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BODY GROUND) 

    Pre-procedure1

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

      Standard Resistance

      W/ FRONT LIDAR SENSOR

      Tester Connection Condition Specified Condition Result
      D43-6 (LR) - Body ground Always 10 kΩ or higher kΩ
      W/O FRONT LIDAR SENSOR

      Tester Connection Condition Specified Condition Result
      D200-6 (LR) - Body ground Always 10 kΩ or higher kΩ

      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. CHECK FRONT TURN SIGNAL LIGHT ASSEMBLY RH 

    Pre-procedure1

    • Disconnect the A90 front turn signal light assembly RH connector.
    • Check for DTC.

      Body Electrical > Combination Meter > Trouble Codes 

      Result

      Result Proceed to
      B1508-19 is output A
      B1507-18 is output B

    Post-procedure1

    • None

    Result: 

    B 

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

    Result: 

    A 

    See step  18

  18. CLEAR DTC 
    1. Clear the DTC.

      Body Electrical > Combination Meter > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  19

  19. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BODY GROUND) 

    Pre-procedure1

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

      Standard Resistance

      W/ FRONT LIDAR SENSOR

      Tester Connection Condition Specified Condition Result
      D43-6 (LR) - Body ground Always 10 kΩ or higher kΩ
      W/O FRONT LIDAR SENSOR

      Tester Connection Condition Specified Condition Result
      D200-6 (LR) - Body ground Always 10 kΩ or higher kΩ

      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 

  20. CLEAR DTC 
    1. Clear the DTC.

      Body Electrical > Combination Meter > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  21

  21. CHECK REAR COMBINATION LIGHT CORD LH 

    Pre-procedure1

    • Disconnect the G73 rear combination light cord LH connector.
    • Check for DTC.

      Body Electrical > Combination Meter > Trouble Codes 

      Result

      Result Proceed to
      B1508-19 is output A
      B1507-18 is output B

    Post-procedure1

    • None

    Result: 

    B 

    See step  28

    Result: 

    A 

    See step  22

  22. CHECK FRONT MULTIPLEX NETWORK DOOR ECU LH 

    Pre-procedure1

    • Disconnect the E25 front multiplex network door ECU LH connector.
    • Check for DTC.

      Body Electrical > Combination Meter > Trouble Codes 

      Result

      Result Proceed to
      B1508-19 is output A
      B1507-18 is output B

    Post-procedure1

    • None

    Result: 

    B 

    See step  24

    Result: 

    A 

    See step  23

  23. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BODY GROUND) 

    Pre-procedure1

    • Disconnect the D43*1 or D200*2 combination meter assembly connector.
      1. *1: w/ Front LiDAR Sensor
      2. *2: w/o Front LiDAR Sensor
    • Disconnect the E25 front multiplex network door ECU LH connector.
    • Disconnect the G73 rear combination light cord LH connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      W/ FRONT LIDAR SENSOR

      Tester Connection Condition Specified Condition Result
      D43-22 (TRNL) - Body ground Always 10 kΩ or higher kΩ
      W/O FRONT LIDAR SENSOR

      Tester Connection Condition Specified Condition Result
      D200-22 (TRNL) - Body ground Always 10 kΩ or higher kΩ

      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 

  24. CLEAR DTC 
    1. Clear the DTC.

      Body Electrical > Combination Meter > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  25

  25. CHECK OUTER MIRROR RETRACTOR LH 

    Pre-procedure1

    • Disconnect the z29 outer mirror retractor LH connector.
    • Check for DTC.

      Body Electrical > Combination Meter > Trouble Codes 

      Result

      Result Proceed to
      B1508-19 is output A
      B1507-18 is output B

    Post-procedure1

    • None

    Result: 

    A 

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

    Result: 

    B 

    See step  26

  26. CLEAR DTC 
    1. Clear the DTC.

      Body Electrical > Combination Meter > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  27

  27. CHECK SIDE TURN SIGNAL LIGHT ASSEMBLY LH 

    Pre-procedure1

    • Check for DTC.

      Body Electrical > Combination Meter > Trouble Codes 

      Result

      Result Proceed to
      B1508-19 is output A
      B1507-18 is output B

    Post-procedure1

    • None

    Result: 

    A 

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

    Result: 

    B 

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

  28. CLEAR DTC 
    1. Clear the DTC.

      Body Electrical > Combination Meter > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  29

  29. CHECK REAR TURN SIGNAL LIGHT LED 

    Pre-procedure1

    • Check for DTC.

      Body Electrical > Combination Meter > Trouble Codes 

      Result

      Result Proceed to
      B1508-19 is output A
      B1507-18 is output B

    Post-procedure1

    • None

    Result: 

    A 

    REPLACE REAR COMBINATION LIGHT CORD LH. Refer to  DISASSEMBLY [11/2020 - ] 

    Result: 

    B 

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

  30. CLEAR DTC 
    1. Clear the DTC.

      Body Electrical > Combination Meter > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  31

  31. CHECK REAR COMBINATION LIGHT CORD RH 

    Pre-procedure1

    • Disconnect the G72 rear combination light cord RH connector.
    • Check for DTC.

      Body Electrical > Combination Meter > Trouble Codes 

      Result

      Result Proceed to
      B1508-19 is output A
      B1507-18 is output B

    Post-procedure1

    • None

    Result: 

    B 

    See step  38

    Result: 

    A 

    See step  32

  32. CHECK FRONT MULTIPLEX NETWORK DOOR ECU RH 

    Pre-procedure1

    • Disconnect the E7 front multiplex network door ECU RH connector.
    • Check for DTC.

      Body Electrical > Combination Meter > Trouble Codes 

      Result

      Result Proceed to
      B1508-19 is output A
      B1507-18 is output B

    Post-procedure1

    • None

    Result: 

    B 

    See step  34

    Result: 

    A 

    See step  33

  33. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BODY GROUND) 

    Pre-procedure1

    • Disconnect the D43*1 or D200*2 combination meter assembly connector.
      1. *1: w/ Front LiDAR Sensor
      2. *2: w/o Front LiDAR Sensor
    • Disconnect the E7 front multiplex network door ECU RH connector.
    • Disconnect the G72 rear combination light cord RH connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      W/ FRONT LIDAR SENSOR

      Tester Connection Condition Specified Condition Result
      D43-38 (TRNR) - Body ground Always 10 kΩ or higher kΩ
      W/O FRONT LIDAR SENSOR

      Tester Connection Condition Specified Condition Result
      D200-21 (TRNR) - Body ground Always 10 kΩ or higher kΩ

      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 

  34. CLEAR DTC 
    1. Clear the DTC.

      Body Electrical > Combination Meter > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  35

  35. CHECK OUTER MIRROR RETRACTOR RH 

    Pre-procedure1

    • Disconnect the z28 outer mirror retractor RH connector.
    • Check for DTC.

      Body Electrical > Combination Meter > Trouble Codes 

      Result

      Result Proceed to
      B1508-19 is output A
      B1507-18 is output B

    Post-procedure1

    • None

    Result: 

    A 

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

    Result: 

    B 

    See step  36

  36. CLEAR DTC 
    1. Clear the DTC.

      Body Electrical > Combination Meter > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  37

  37. CHECK SIDE TURN SIGNAL LIGHT ASSEMBLY RH 

    Pre-procedure1

    • Check for DTC.

      Body Electrical > Combination Meter > Trouble Codes 

      Result

      Result Proceed to
      B1508-19 is output A
      B1507-18 is output B

    Post-procedure1

    • None

    Result: 

    A 

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

    Result: 

    B 

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

  38. CLEAR DTC 
    1. Clear the DTC.

      Body Electrical > Combination Meter > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  39

  39. CHECK REAR TURN SIGNAL LIGHT LED 

    Pre-procedure1

    • Check for DTC.

      Body Electrical > Combination Meter > Trouble Codes 

      Result

      Result Proceed to
      B1508-19 is output A
      B1507-18 is output B

    Post-procedure1

    • None

    Result: 

    A 

    REPLACE REAR COMBINATION LIGHT CORD RH. Refer to  DISASSEMBLY [11/2020 - ] 

    Result: 

    B 

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

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