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Home >> Lexus >> 2024 >> GX 550 Overtrail >> 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 [12/2023 - ] >> 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
      Front turn signal light RH do not blink. A
      Front turn signal light LH do not blink. B
      Rear turn signal light RH do not blink. C
      Rear turn signal light LH do not blink. D

    Result: 

    B 

    See step  5

    Result: 

    C 

    See step  8

    Result: 

    D 

    See step  11

    Result: 

    A 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY RH - COMBINATION METER ASSEMBLY AND BODY GROUND) 

    Pre-procedure1

    1. Disconnect the A53 headlight ECU sub-assembly RH connector.
    2. Disconnect the E5 combination meter assembly connector.

      Procedure1

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      A53-11 (TNS) - E5-6 (LR) Always Below 1 Ω
      A53-12 (GND) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  3

  3. INSPECT LIGHTS 
    1. Inspect the illumination of side turn signal light.

      Result

      Result Proceed to
      Side turn signal light RH blink. A
      Side turn signal light RH do not blink. B

    Result: 

    B 

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

    Result: 

    A 

    See step  4

  4. CHECK HEADLIGHT ECU SUB-ASSEMBLY RH 

    Pre-procedure1

    1. Remove the headlight ECU sub-assembly RH.

      HINT: 

      Refer to REMOVAL [12/2023 - ]

      GTY1213531Courtesy 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)
    2. Reconnect the A53 headlight ECU sub-assembly RH connector.

      Procedure1

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      E5-6 (LR) - A-7 Always Below 1 Ω
      A-15 - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    OK 

    REPLACE HEADLIGHT ASSEMBLY RH. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    NG 

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH. Refer to  REMOVAL [12/2023 - ] 

  5. CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY LH - COMBINATION METER ASSEMBLY AND BODY GROUND) 

    Pre-procedure1

    1. Disconnect the A52 headlight ECU sub-assembly LH connector.
    2. Disconnect the E5 combination meter assembly connector.

      Procedure1

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      A52-11 (TNS) - E5-5 (LL) Always Below 1 Ω
      A52-12 (GND) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  6

  6. INSPECT LIGHTS 
    1. Inspect the illumination of side turn signal light.

      Result

      Result Proceed to
      Side turn signal light LH blink. A
      Side turn signal light LH do not blink. B

    Result: 

    B 

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

    Result: 

    A 

    See step  7

  7. CHECK HEADLIGHT ECU SUB-ASSEMBLY LH 

    Pre-procedure1

    1. Remove the headlight ECU sub-assembly LH.

      HINT: 

      Refer to REMOVAL [12/2023 - ]

      GTY1213532Courtesy 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)
    2. Reconnect the A52 headlight ECU sub-assembly LH connector.

      Procedure1

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      E5-5 (LL) - A-7 Always Below 1 Ω
      A-15 - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    OK 

    REPLACE HEADLIGHT ASSEMBLY LH. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    NG 

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [12/2023 - ] 

  8. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT SOCKET AND WIRE RH - COMBINATION METER ASSEMBLY AND BODY GROUND) 

    Pre-procedure1

    1. Disconnect the K50 rear combination light socket and wire RH connector.
    2. Disconnect the E5 combination meter assembly connector.

      Procedure1

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      K50-3 (TRN) - E5-21 (TRNR) Always Below 1 Ω
      K50-4 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  9

  9. INSPECT REAR COMBINATION LIGHT SOCKET AND WIRE RH 

    Refer to INSPECTION [12/2023 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE REAR COMBINATION LIGHT SOCKET AND WIRE RH. Refer to  DISASSEMBLY [12/2023 - ] 

    Result: 

    OK 

    See step  10

  10. INSPECT REAR COMBINATION LIGHT LENS AND BODY RH 

    Refer to INSPECTION [12/2023 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

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

    Result: 

    NG 

    REPLACE OMBINATION LIGHT LENS AND BODY RH. Refer to  DISASSEMBLY [12/2023 - ] 

  11. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT SOCKET AND WIRE LH - COMBINATION METER ASSEMBLY AND BODY GROUND) 

    Pre-procedure1

    1. Disconnect the K49 rear combination light socket and wire LH connector.
    2. Disconnect the E5 combination meter assembly connector.

      Procedure1

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      K49-3 (TRN) - E5-22 (TRNL) Always Below 1 Ω
      K49-4 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  12

  12. INSPECT REAR COMBINATION LIGHT SOCKET AND WIRE LH 

    Refer to INSPECTION [12/2023 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE REAR COMBINATION LIGHT SOCKET AND WIRE LH. Refer to  DISASSEMBLY [12/2023 - ] 

    Result: 

    OK 

    See step  13

  13. INSPECT COMBINATION LIGHT LENS AND BODY LH 

    Refer to INSPECTION [12/2023 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

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

    Result: 

    NG 

    REPLACE COMBINATION LIGHT LENS AND BODY LH. Refer to  DISASSEMBLY [12/2023 - ] 

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