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Home >> Lexus >> 2021 >> LS 500 Base, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Meter / Gauge System - Diagnostic Codes (1 Of 2) >> Meter / Gauge System >> DTC B1508-19: Turn Signal/Hazard Flasher Circuit Current Above Threshold [12/2017 - 10/2020] >> Procedure

DTC B1508-19: Turn Signal/Hazard Flasher Circuit Current Above Threshold [12/2017 - 10/2020]: Procedure

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

      Result

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

    Result: 

    B 

    See step  13

    Result: 

    C 

    See step  24

    Result: 

    D 

    See step  31

    Result: 

    A 

    See step  2

  2. CLEAR DTC 
    1. Clear the DTC.

      Refer to DTC CHECK / CLEAR [12/2017 - ]

      Body Electrical > Combination Meter > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  3

  3. CHECK HEADLIGHT ECU SUB-ASSEMBLY LH 
    1. Disconnect the A31 headlight ECU sub-assembly LH connector.
    2. Check for DTC.

      Refer to DTC CHECK / CLEAR [12/2017 - ]

      Body Electrical > Combination Meter > Trouble Codes 

      Result

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

    Result: 

    B 

    See step  7

    Result: 

    A 

    See step  4

  4. CLEAR DTC 
    1. Clear the DTC.

      Refer to DTC CHECK / CLEAR [12/2017 - ]

      Body Electrical > Combination Meter > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  5

  5. CHECK FRONT MULTIPLEX NETWORK DOOR ECU LH 
    1. Disconnect the H31 front multiplex network door ECU LH connector.
    2. Check for DTC.

      Refer to DTC CHECK / CLEAR [12/2017 - ]

      Body Electrical > Combination Meter > Trouble Codes 

      Result

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

    Result: 

    B 

    See step  9

    Result: 

    A 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBL - BODY GROUND) 
    1. Disconnect the G35 combination meter assembly connector.
    2. Disconnect the A31 headlight ECU sub-assembly LH connector.
    3. Disconnect the H31 front multiplex network door ECU LH connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      G35-13 (LL) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [12/2017 - 10/2020] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  7. CLEAR DTC 
    1. Clear the DTC.

      Refer to DTC CHECK / CLEAR [12/2017 - ]

      Body Electrical > Combination Meter > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  8

  8. CHECK HEADLIGHT UNIT ASSEMBLY LH 
    1. Remove the headlight unit assembly LH.

      Refer to REMOVAL [12/2017 - 10/2020]

    2. Reconnect the A31 headlight ECU sub-assembly LH connector.
    3. Check for DTC.

      Refer to DTC CHECK / CLEAR [12/2017 - ]

      Body Electrical > Combination Meter > Trouble Codes 

      Result

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

    Result: 

    A 

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [12/2017 - 10/2020] 

    Result: 

    B 

    REPLACE HEADLIGHT UNIT ASSEMBLY LH. Refer to  DISASSEMBLY [12/2017 - 10/2020] 

  9. CLEAR DTC 
    1. Clear the DTC.

      Refer to DTC CHECK / CLEAR [12/2017 - ]

      Body Electrical > Combination Meter > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  10

  10. CHECK OUTER MIRROR ACTUATOR ASSEMBLY LH 
    1. Disconnect the z38 outer mirror actuator assembly LH connector.
    2. Check for DTC.

      Refer to DTC CHECK / CLEAR [12/2017 - ]

      Body Electrical > Combination Meter > Trouble Codes 

      Result

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

    Result: 

    A 

    REPLACE FRONT MULTIPLEX NETWORK DOOR ECU LH. Refer to  DISASSEMBLY [12/2017 - 09/2018]  , or refer to  DISASSEMBLY [09/2018 - 10/2020] 

    Result: 

    B 

    See step  11

  11. CLEAR DTC 
    1. Clear the DTC.

      Refer to DTC CHECK / CLEAR [12/2017 - ]

      Body Electrical > Combination Meter > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  12

  12. CHECK SIDE TURN SIGNAL LIGHT ASSEMBLY LH 
    1. Disconnect the z10 side turn signal light assembly LH connector.
    2. Check for DTC.

      Refer to DTC CHECK / CLEAR [12/2017 - ]

      Body Electrical > Combination Meter > Trouble Codes 

      Result

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

    Result: 

    A 

    REPLACE OUTER MIRROR ACTUATOR ASSEMBLY LH. Refer to  DISASSEMBLY [12/2017 - 10/2022] 

    Result: 

    B 

    REPLACE SIDE TURN SIGNAL LIGHT ASSEMBLY LH. Refer to  REMOVAL [12/2017 - ] 

  13. CLEAR DTC 
    1. Clear the DTC.

      Refer to DTC CHECK / CLEAR [12/2017 - ]

      Body Electrical > Combination Meter > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  14

  14. CHECK HEADLIGHT ECU SUB-ASSEMBLY RH 
    1. Disconnect the A32 headlight ECU sub-assembly RH connector.
    2. Check for DTC.

      Refer to DTC CHECK / CLEAR [12/2017 - ]

      Body Electrical > Combination Meter > Trouble Codes 

      Result

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

    Result: 

    B 

    See step  18

    Result: 

    A 

    See step  15

  15. CLEAR DTC 
    1. Clear the DTC.

      Refer to DTC CHECK / CLEAR [12/2017 - ]

      Body Electrical > Combination Meter > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  16

  16. CHECK FRONT MULTIPLEX NETWORK DOOR ECU RH 
    1. Disconnect the H12 front multiplex network door ECU RH connector.
    2. Check for DTC.

      Refer to DTC CHECK / CLEAR [12/2017 - ]

      Body Electrical > Combination Meter > Trouble Codes 

      Result

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

    Result: 

    B 

    See step  20

    Result: 

    A 

    See step  17

  17. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBL - BODY GROUND) 
    1. Disconnect the G35 combination meter assembly connector.
    2. Disconnect the A32 headlight ECU sub-assembly RH connector.
    3. Disconnect the H12 front multiplex network door ECU RH connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      G35-7 (LR) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [12/2017 - 10/2020] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  18. CLEAR DTC 
    1. Clear the DTC.

      Refer to DTC CHECK / CLEAR [12/2017 - ]

      Body Electrical > Combination Meter > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  19

  19. CHECK HEADLIGHT UNIT ASSEMBLY RH 
    1. Remove the headlight unit assembly RH.

      Refer to REMOVAL [12/2017 - 10/2020]

    2. Reconnect the A32 headlight ECU sub-assembly RH connector.
    3. Check for DTC.

      Refer to DTC CHECK / CLEAR [12/2017 - ]

      Body Electrical > Combination Meter > Trouble Codes 

      Result

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

    Result: 

    A 

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH. Refer to  REMOVAL [12/2017 - 10/2020] 

    Result: 

    B 

    REPLACE HEADLIGHT UNIT ASSEMBLY RH. Refer to  DISASSEMBLY [12/2017 - 10/2020] 

  20. CLEAR DTC 
    1. Clear the DTC.

      Refer to DTC CHECK / CLEAR [12/2017 - ]

      Body Electrical > Combination Meter > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  21

  21. CHECK OUTER MIRROR ACTUATOR ASSEMBLY RH 
    1. Disconnect the z37 outer mirror actuator assembly RH connector.
    2. Check for DTC.

      Refer to DTC CHECK / CLEAR [12/2017 - ]

      Body Electrical > Combination Meter > Trouble Codes 

      Result

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

    Result: 

    A 

    REPLACE FRONT MULTIPLEX NETWORK DOOR ECU RH. Refer to  DISASSEMBLY [12/2017 - 09/2018]  , or refer to  DISASSEMBLY [09/2018 - 10/2020] 

    Result: 

    B 

    See step  22

  22. CLEAR DTC 
    1. Clear the DTC.

      Refer to DTC CHECK / CLEAR [12/2017 - ]

      Body Electrical > Combination Meter > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  23

  23. CHECK SIDE TURN SIGNAL LIGHT ASSEMBLY RH 
    1. Disconnect the z9 side turn signal light assembly RH connector.
    2. Check for DTC.

      Refer to DTC CHECK / CLEAR [12/2017 - ]

      Body Electrical > Combination Meter > Trouble Codes 

      Result

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

    Result: 

    A 

    REPLACE OUTER MIRROR ACTUATOR ASSEMBLY RH. Refer to  DISASSEMBLY [12/2017 - 10/2022] 

    Result: 

    B 

    REPLACE SIDE TURN SIGNAL LIGHT ASSEMBLY RH. Refer to  REMOVAL [12/2017 - ] 

  24. CLEAR DTC 
    1. Clear the DTC.

      Refer to DTC CHECK / CLEAR [12/2017 - ]

      Body Electrical > Combination Meter > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  25

  25. CHECK REAR LIGHT LENS AND BODY LH 
    1. Disconnect the L86 rear light assembly LH connector.
    2. Check for DTC.

      Refer to DTC CHECK / CLEAR [12/2017 - ]

      Body Electrical > Combination Meter > Trouble Codes 

      Result

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

    Result: 

    B 

    See step  29

    Result: 

    A 

    See step  26

  26. CLEAR DTC 
    1. Clear the DTC.

      Refer to DTC CHECK / CLEAR [12/2017 - ]

      Body Electrical > Combination Meter > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  27

  27. CHECK REAR COMBINATION LIGHT LENS AND BODY LH 
    1. Disconnect the L82 rear combination light assembly LH connector.
    2. Check for DTC.

      Refer to DTC CHECK / CLEAR [12/2017 - ]

      Body Electrical > Combination Meter > Trouble Codes 

      Result

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

    Result: 

    B 

    REPLACE REAR COMBINATION LIGHT LENS AND BODY LH. Refer to  REMOVAL [12/2017 - 10/2020] 

    Result: 

    A 

    See step  28

  28. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBL - BODY GROUND) 
    1. Disconnect the G35 combination meter assembly connector.
    2. Disconnect the L86 rear light assembly LH connector.
    3. Disconnect the L82 rear combination light assembly LH connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      G35-11 (TRNL) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [12/2017 - 10/2020] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  29. CLEAR DTC 
    1. Clear the DTC.

      Refer to DTC CHECK / CLEAR [12/2017 - ]

      Body Electrical > Combination Meter > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  30

  30. CHECK REAR COMBINATION LIGHT LENS AND BODY LH 
    1. Disconnect the L82 rear combination light assembly LH connector.
    2. Check for DTC.

      Refer to DTC CHECK / CLEAR [12/2017 - ]

      Body Electrical > Combination Meter > Trouble Codes 

      Result

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

    Result: 

    A 

    REPLACE REAR LIGHT LENS AND BODY LH. Refer to  REMOVAL [12/2017 - ] 

    Result: 

    B 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  31. CLEAR DTC 
    1. Clear the DTC.

      Refer to DTC CHECK / CLEAR [12/2017 - ]

      Body Electrical > Combination Meter > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  32

  32. CHECK REAR LIGHT LENS AND BODY RH 
    1. Disconnect the L90 rear light assembly RH connector.
    2. Check for DTC.

      Refer to DTC CHECK / CLEAR [12/2017 - ]

      Body Electrical > Combination Meter > Trouble Codes 

      Result

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

    Result: 

    B 

    See step  36

    Result: 

    A 

    See step  33

  33. CLEAR DTC 
    1. Clear the DTC.

      Refer to DTC CHECK / CLEAR [12/2017 - ]

      Body Electrical > Combination Meter > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  34

  34. CHECK REAR COMBINATION LIGHT LENS AND BODY RH 
    1. Disconnect the L81 rear combination light assembly RH connector.
    2. Check for DTC.

      Refer to DTC CHECK / CLEAR [12/2017 - ]

      Body Electrical > Combination Meter > Trouble Codes 

      Result

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

    Result: 

    B 

    REPLACE REAR COMBINATION LIGHT LENS AND BODY RH. Refer to  REMOVAL [12/2017 - 10/2020] 

    Result: 

    A 

    See step  35

  35. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBL - BODY GROUND) 
    1. Disconnect the G35 combination meter assembly connector.
    2. Disconnect the L90 rear light assembly RH connector.
    3. Disconnect the L81 rear combination light assembly RH connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      G35-5 (TRNR) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [12/2017 - 10/2020] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  36. CLEAR DTC 
    1. Clear the DTC.

      Refer to DTC CHECK / CLEAR [12/2017 - ]

      Body Electrical > Combination Meter > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  37

  37. CHECK REAR COMBINATION LIGHT LENS AND BODY RH 
    1. Disconnect the L81 rear combination light assembly RH connector.
    2. Check for DTC.

      Refer to DTC CHECK / CLEAR [12/2017 - ]

      Body Electrical > Combination Meter > Trouble Codes 

      Result

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

    Result: 

    A 

    REPLACE REAR LIGHT LENS AND BODY RH. Refer to  REMOVAL [12/2017 - ] 

    Result: 

    B 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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