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Home >> Lexus >> 2024 >> LX 600 Base >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Meter / Gauge System - Diagnostic Codes & Symptom Tests >> Meter / Gauge System >> DTC B1507-18: Turn Signal Light Circuit Current Below Threshold [12/2021 - ] >> Procedure

DTC B1507-18: Turn Signal Light Circuit Current Below Threshold [12/2021 - ]: 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 do not blink. A
      Front turn signal light RH and side turn signal light RH do not blink. B
      Front turn signal light LH does not blink. C
      Front turn signal light RH does not blink. D
      Side turn signal light LH does not blink. E
      Side turn signal light RH does not blink. F
      Rear turn signal light LH does not blink. G
      Rear turn signal light RH does not blink. H

    Result: 

    B 

    See step  3

    Result: 

    C 

    See step  4

    Result: 

    D 

    See step  9

    Result: 

    E 

    See step  14

    Result: 

    F 

    See step  21

    Result: 

    G 

    See step  28

    Result: 

    H 

    See step  34

    Result: 

    A 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - HEADLIGHT CORD LH) 

    Pre-procedure1

    • Disconnect the I6 combination meter assembly connector.
    • Disconnect the B83 headlight cord LH connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I6-14 (LL) - B83-7 (TNS) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [12/2021 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  3. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - HEADLIGHT CORD RH) 

    Pre-procedure1

    • Disconnect the I6 combination meter assembly connector.
    • Disconnect the B85 headlight cord RH connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I6-5 (LR) - B85-7 (TNS) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [12/2021 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  4. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - HEADLIGHT CORD LH) 

    Pre-procedure1

    • Disconnect the I6 combination meter assembly connector.
    • Disconnect the B83 headlight cord LH connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I6-14 (LL) - B83-7 (TNS) Always Below 1 Ω
      B83-8 (GND) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. CHECK HEADLIGHT CORD LH 

    Pre-procedure1

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      B83-7 (TNS) - A-18 Always Below 1 Ω
      B83-8 (GND) - A-19 Always Below 1 Ω
      GTY1073563Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Headlight Cord LH)

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    NG 

    REPLACE HEADLIGHT CORD LH. Refer to  DISASSEMBLY [12/2021 - ] 

    Result: 

    OK 

    See step  6

  6. CHECK HEADLIGHT ECU SUB-ASSEMBLY LH 

    Pre-procedure1

    • Remove the headlight ECU sub-assembly LH as a unit with the connectors still connected.
      GTY1081648Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Headlight ECU Sub-assembly LH)
      *b Front view of wire harness connector
      (to Combination Meter Assembly)

      HINT: 

      Refer to REMOVAL [12/2021 - ]

    • Disconnect the I6 combination meter assembly connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I6-14 (LL) - B-17 Always Below 1 Ω
      B-18 - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    NG 

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [12/2021 - ] 

    Result: 

    OK 

    See step  7

  7. CHECK VEHICLE TYPE 
    1. Check vehicle condition.

      Result

      Result  Proceed to 
      w/ Adaptive High Beam System A
      w/o Adaptive High Beam System B

    Result: 

    B 

    REPLACE HEADLIGHT ASSEMBLY LH. Refer to  REMOVAL [12/2021 - ] 

    Result: 

    A 

    See step  8

  8. CHECK HEADLIGHT TURN SIGNAL LED UNIT LH 
    1. Replace the headlight turn signal led unit LH with a new known good one.

      HINT: 

      Refer to DISASSEMBLY [12/2021 - ]

    2. Operate the turn signal switch and check that the LH side turn signal light operates normally.

      OK

      The front turn signal light LH operates normally.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END (HEADLIGHT TURN SIGNAL LED UNIT LH WAS DEFECTIVE) 

    Result: 

    NG 

    REPLACE HEADLIGHT ASSEMBLY LH. Refer to  REMOVAL [12/2021 - ] 

  9. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - HEADLIGHT CORD RH) 

    Pre-procedure1

    • Disconnect the I6 combination meter assembly connector.
    • Disconnect the B85 headlight cord RH connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I6-5 (LR) - B85-7 (TNS) Always Below 1 Ω
      B85-1 (GND) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  10

  10. CHECK HEADLIGHT CORD RH 

    Pre-procedure1

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      B85-7 (TNS) - A-15 Always Below 1 Ω
      B85-1 (GND) - A-16 Always Below 1 Ω
      GTY1073565Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Headlight Cord LH)

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    NG 

    REPLACE HEADLIGHT CORD RH. Refer to  DISASSEMBLY [12/2021 - ] 

    Result: 

    OK 

    See step  11

  11. CHECK HEADLIGHT ECU SUB-ASSEMBLY RH 

    Pre-procedure1

    • Remove the headlight ECU sub-assembly RH as a unit with the connectors still connected.
      GTY1082500Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Headlight ECU Sub-assembly RH)
      *b Front view of wire harness connector
      (to Combination Meter Assembly)

      HINT: 

      Refer to REMOVAL [12/2021 - ]

    • Disconnect the I6 combination meter assembly connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I6-5 (LR) - B-17 Always Below 1 Ω
      B-18 - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    NG 

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH. Refer to  REMOVAL [12/2021 - ] 

    Result: 

    OK 

    See step  12

  12. CHECK VEHICLE TYPE 
    1. Check vehicle condition.

      Result

      Result  Proceed to 
      w/ Adaptive High Beam System A
      w/o Adaptive High Beam System B

    Result: 

    B 

    REPLACE HEADLIGHT ASSEMBLY RH. Refer to  REMOVAL [12/2021 - ] 

    Result: 

    A 

    See step  13

  13. CHECK HEADLIGHT TURN SIGNAL LED UNIT RH 
    1. Replace the headlight turn signal led unit RH with a new known good one.

      HINT: 

      Refer to DISASSEMBLY [12/2021 - ]

    2. Operate the turn signal switch and check that the RH side turn signal light operates normally.

      OK

      The front turn signal light RH operates normally.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END (HEADLIGHT TURN SIGNAL LED UNIT RH WAS DEFECTIVE) 

    Result: 

    NG 

    REPLACE HEADLIGHT ASSEMBLY RH. Refer to  REMOVAL [12/2021 - ] 

  14. CHECK VEHICLE TYPE 
    1. Check vehicle condition.

      Result

      Result  Proceed to 
      w/o Door Closer System A
      w/ Door Closer System B

    Result: 

    B 

    See step  18

    Result: 

    A 

    See step  15

  15. CHECK HARNESS AND CONNECTOR (OUTER MIRROR CONTROL ECU ASSEMBLY LH - COMBINATION METER ASSEMBLY AND BODY GROUND) 

    Pre-procedure1

    • Disconnect the N1 outer mirror control ECU assembly LH connector.
    • Disconnect the I6 combination meter assembly connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I6-14 (LL) - N1-11 (TRNI) Always Below 1 Ω
      N1-7 (GND) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  16

  16. INSPECT OUTER REAR VIEW MIRROR ASSEMBLY LH 

    Refer to INSPECTION [12/2021 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY LH. Refer to  DISASSEMBLY [12/2021 - ] 

    Result: 

    NG 

    See step  17

  17. INSPECT SIDE TURN SIGNAL LIGHT ASSEMBLY LH 

    Refer to INSPECTION [12/2021 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE OUTER MIRROR RETRACTOR LH. Refer to  DISASSEMBLY [12/2021 - ] 

    Result: 

    NG 

    REPLACE SIDE TURN SIGNAL LIGHT ASSEMBLY LH. Refer to  REMOVAL [12/2021 - ] 

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

    Pre-procedure1

    • Disconnect the N26 front multiplex network door ECU LH connector.
    • Disconnect the I6 combination meter assembly connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I6-14 (LL) - N26-20 (TRNI) Always Below 1 Ω
      N26-1 (GND) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  19

  19. INSPECT OUTER REAR VIEW MIRROR ASSEMBLY LH 

    Refer to INSPECTION [12/2021 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE FRONT MULTIPLEX NETWORK DOOR ECU LH. Refer to  DISASSEMBLY [12/2021 - ] 

    Result: 

    NG 

    See step  20

  20. INSPECT SIDE TURN SIGNAL LIGHT ASSEMBLY LH 

    Refer to INSPECTION [12/2021 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE OUTER MIRROR RETRACTOR LH. Refer to  DISASSEMBLY [12/2021 - ] 

    Result: 

    NG 

    REPLACE SIDE TURN SIGNAL LIGHT ASSEMBLY LH. Refer to  REMOVAL [12/2021 - ] 

  21. CHECK VEHICLE TYPE 
    1. Check vehicle condition.

      Result

      Result  Proceed to 
      w/o Door Closer System A
      w/ Door Closer System B

    Result: 

    B 

    See step  25

    Result: 

    A 

    See step  22

  22. CHECK HARNESS AND CONNECTOR (OUTER MIRROR CONTROL ECU ASSEMBLY RH - COMBINATION METER ASSEMBLY AND BODY GROUND) 

    Pre-procedure1

    • Disconnect the M1 outer mirror control ECU assembly RH connector.
    • Disconnect the I6 combination meter assembly connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I6-5 (LR) - M1-11 (TRNI) Always Below 1 Ω
      M1-7 (GND) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  23

  23. INSPECT OUTER REAR VIEW MIRROR ASSEMBLY RH 

    Refer to INSPECTION [12/2021 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY RH. Refer to  DISASSEMBLY [12/2021 - ] 

    Result: 

    NG 

    See step  24

  24. INSPECT SIDE TURN SIGNAL LIGHT ASSEMBLY RH 

    Refer to INSPECTION [12/2021 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE OUTER MIRROR RETRACTOR RH. Refer to  DISASSEMBLY [12/2021 - ] 

    Result: 

    NG 

    REPLACE SIDE TURN SIGNAL LIGHT ASSEMBLY RH. Refer to  REMOVAL [12/2021 - ] 

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

    Pre-procedure1

    • Disconnect the M25 front multiplex network door ECU RH connector.
    • Disconnect the I6 combination meter assembly connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I6-5 (LR) - M25-20 (TRNI) Always Below 1 Ω
      M25-1 (GND) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  26

  26. INSPECT OUTER REAR VIEW MIRROR ASSEMBLY RH 

    Refer to INSPECTION [12/2021 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE FRONT MULTIPLEX NETWORK DOOR ECU RH. Refer to  DISASSEMBLY [12/2021 - ] 

    Result: 

    NG 

    See step  27

  27. INSPECT SIDE TURN SIGNAL LIGHT ASSEMBLY RH 

    Refer to INSPECTION [12/2021 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE OUTER MIRROR RETRACTOR RH. Refer to  DISASSEMBLY [12/2021 - ] 

    Result: 

    NG 

    REPLACE SIDE TURN SIGNAL LIGHT ASSEMBLY RH. Refer to  REMOVAL [12/2021 - ] 

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

      Result

      Result Proceed to
      All LH side rear turn signal lights do not blink. A
      Rear light assembly LH does not illuminate. B
      Rear combination light assembly LH does not illuminate. C

    Result: 

    B 

    See step  30

    Result: 

    C 

    See step  32

    Result: 

    A 

    See step  29

  29. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT CORD LH - COMBINATION METER ASSEMBLY AND BODY GROUND) 

    Pre-procedure1

    • Disconnect the I6 combination meter assembly connector.
    • Disconnect the c1 rear combination light cord LH connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I6-1 (TRNL) - c1-1 (TRN) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [12/2021 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  30. INSPECT REAR LIGHT SOCKET AND WIRE 

    Refer to INSPECTION [12/2021 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE REAR LIGHT SOCKET AND WIRE. Refer to  DISASSEMBLY [12/2021 - ] 

    Result: 

    OK 

    See step  31

  31. INSPECT REAR LIGHT ASSEMBLY 

    Refer to INSPECTION [12/2021 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    NG 

    REPLACE REAR LIGHT ASSEMBLY. Refer to  REMOVAL [12/2021 - ] 

  32. INSPECT REAR COMBINATION LIGHT CORD LH 

    Refer to INSPECTION [12/2021 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE REAR COMBINATION LIGHT CORD LH. Refer to  DISASSEMBLY [12/2021 - ] 

    Result: 

    OK 

    See step  33

  33. INSPECT REAR COMBINATION LIGHT ASSEMBLY LH 

    Refer to INSPECTION [12/2021 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    NG 

    REPLACE REAR COMBINATION LIGHT ASSEMBLY LH. Refer to  REMOVAL [12/2021 - ] 

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

      Result

      Result Proceed to
      All RH side rear turn signal lights do not blink. A
      Rear light assembly RH does not illuminate. B
      Rear combination light assembly RH does not illuminate. C

    Result: 

    B 

    See step  36

    Result: 

    C 

    See step  38

    Result: 

    A 

    See step  35

  35. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT CORD RH - COMBINATION METER ASSEMBLY) 

    Pre-procedure1

    • Disconnect the I6 combination meter assembly connector.
    • Disconnect the b1 rear combination light cord RH connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I6-2 (TRNR) - b1-1 (TRN) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [12/2021 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  36. INSPECT REAR LIGHT SOCKET AND WIRE 

    Refer to INSPECTION [12/2021 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE REAR LIGHT SOCKET AND WIRE. Refer to  DISASSEMBLY [12/2021 - ] 

    Result: 

    OK 

    See step  37

  37. INSPECT REAR LIGHT ASSEMBLY 

    Refer to INSPECTION [12/2021 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    NG 

    REPLACE REAR LIGHT ASSEMBLY. Refer to  REMOVAL [12/2021 - ] 

  38. INSPECT REAR COMBINATION LIGHT CORD RH 

    Refer to INSPECTION [12/2021 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE REAR COMBINATION LIGHT CORD RH. Refer to  DISASSEMBLY [12/2021 - ] 

    Result: 

    OK 

    See step  39

  39. INSPECT REAR COMBINATION LIGHT ASSEMBLY RH 

    Refer to INSPECTION [12/2021 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    NG 

    REPLACE REAR COMBINATION LIGHT ASSEMBLY RH. Refer to  REMOVAL [12/2021 - ] 

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