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Home >> Toyota >> 2024 >> Land Cruiser Base >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Meter / Gauge System - Diagnostic Codes, Symptom Tests & Circuit Tests >> Meter / Gauge System >> DTC B1507-18: Turn Signal Light Circuit Current Below Threshold [02/2024 - ] >> Procedure

DTC B1507-18: Turn Signal Light Circuit Current Below Threshold [02/2024 - ]: 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  11

    Result: 

    C 

    See step  20

    Result: 

    D 

    See step  23

    Result: 

    A 

    See step  2

  2. 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 [02/2024 - ]

    Result: 

    A 

    See step  3

  3. CHECK VEHICLE TYPE 
    1. Check vehicle condition.

      Result

      Result  Proceed to 
      for Single Beam Headlight A
      for Triple Beam Headlight B

    Result: 

    B 

    See step  8

    Result: 

    A 

    See step  4

  4. INSPECT HEADLIGHT FRONT TURN SIGNAL LIGHT LED (for RH Side) 

    Refer to INSPECTION [02/2024 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE HEADLIGHT FRONT TURN SIGNAL LIGHT LED (for RH Side) 

    Refer to DISASSEMBLY [02/2024 - ]

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH - COMBINATION METER ASSEMBLY AND BODY GROUND) 

    Pre-procedure1

    1. Disconnect the A53 No. 1 headlight ECU sub-assembly RH connector.
    2. Disconnect the E8*1 or E5*2 combination meter assembly connector.
      1. *1: for 7 Inch Multi-information Display Type
      2. *2: for 12.3 Inch Multi-information Display Type

      Procedure1

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

      Standard Resistance

      FOR 7 INCH MULTI-INFORMATION DISPLAY TYPE

      Tester Connection Condition Specified Condition
      A53-11 (TNS) - E8-30 (LR) Always Below 1 Ω
      A53-12 (GND) - Body ground Always Below 1 Ω
      FOR 12.3 INCH MULTI-INFORMATION DISPLAY TYPE

      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  6

  6. CHECK NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH 

    Pre-procedure1

    1. Remove the No. 1 headlight ECU sub-assembly RH.

      HINT: 

      Refer to REMOVAL [02/2024 - ]

      GTY1223007Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A for 7 Inch Multi-information Display Type
      *B for 12.3 Inch Multi-information Display Type
      *a Component with harness connected
      (No. 1 Headlight ECU Sub-assembly RH)
      *b Front view of wire harness connector
      (to Combination Meter Assembly)
    2. Reconnect the A53 No. 1 headlight ECU sub-assembly RH connector.

      Procedure1

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

      Standard Resistance

      FOR 7 INCH MULTI-INFORMATION DISPLAY TYPE

      Tester Connection Condition Specified Condition
      E8-30 (LR) - A-20 Always Below 1 Ω
      A-6 - Body ground Always Below 1 Ω
      FOR 12.3 INCH MULTI-INFORMATION DISPLAY TYPE

      Tester Connection Condition Specified Condition
      E5-6 (LR) - A-20 Always Below 1 Ω
      A-6 - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    NG 

    REPLACE NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH 

    Refer to REMOVAL [02/2024 - ]

    Result: 

    OK 

    See step  7

  7. INSPECT HEADLIGHT ASSEMBLY RH 

    Pre-procedure1

    1. Remove the front headlight turn signal light LED (for RH Side).

      HINT: 

      Refer to DISASSEMBLY [02/2024 - ]

      Procedure1

    2. Measure the resistance according to the value(s) in the table below.
      GTY1221036Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 1 Headlight ECU Sub-assembly RH)      		 *b Front view of wire harness connector
      (to Front Headlight Turn Signal Light LED (for RH Side))

      Standard Resistance

      Tester Connection Condition Specified Condition
      A-20 - B-1 Always Below 1 Ω
      A-6 - B-2 Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    3. None

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY 

    Refer to REMOVAL [02/2024 - ]

    Result: 

    NG 

    REPLACE HEADLIGHT ASSEMBLY RH 

    Refer to REMOVAL [02/2024 - ]

  8. CHECK HARNESS AND CONNECTOR (NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH - COMBINATION METER ASSEMBLY AND BODY GROUND) 

    Pre-procedure1

    1. Disconnect the A53 No. 1 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  9

  9. CHECK NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH 

    Pre-procedure1

    1. Remove the No. 1 headlight ECU sub-assembly RH.

      HINT: 

      Refer to REMOVAL [02/2024 - ]

      GTY1223009Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (No. 1 Headlight ECU Sub-assembly RH)
      *b Front view of wire harness connector
      (to Combination Meter Assembly)
    2. Reconnect the A53 No. 1 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-20 Always Below 1 Ω
      A-6 - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    NG 

    REPLACE NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH 

    Refer to REMOVAL [02/2024 - ]

    Result: 

    OK 

    See step  10

  10. CHECK HEADLIGHT ASSEMBLY RH 
    1. Remove the headlight assembly RH and LH.
    2. Interchange the headlight assembly RH and connect the connectors.
    3. Operate the turn signal switch and check that the RH side turn signal light operates normally.

      Result

      Result Proceed to
      Front turn signal light RH operates normally A
      Problem symptoms do not change
      (Front turn signal light RH does not blink)      		 B

    Result: 

    A 

    REPLACE HEADLIGHT ASSEMBLY RH 

    Refer to REMOVAL [02/2024 - ]

    Result: 

    B 

    REPLACE COMBINATION METER ASSEMBLY 

    Refer to REMOVAL [02/2024 - ]

  11. 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 [02/2024 - ]

    Result: 

    A 

    See step  12

  12. CHECK VEHICLE TYPE 
    1. Check vehicle condition.

      Result

      Result  Proceed to 
      for Single Beam Headlight A
      for Triple Beam Headlight B

    Result: 

    B 

    See step  17

    Result: 

    A 

    See step  13

  13. INSPECT HEADLIGHT FRONT TURN SIGNAL LIGHT LED (for LH Side) 

    Refer to INSPECTION [02/2024 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE HEADLIGHT FRONT TURN SIGNAL LIGHT LED (for LH Side) 

    Refer to REMOVAL [02/2024 - ]

    Result: 

    OK 

    See step  14

  14. CHECK HARNESS AND CONNECTOR (NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH - COMBINATION METER ASSEMBLY AND BODY GROUND) 

    Pre-procedure1

    1. Disconnect the A52 No. 1 headlight ECU sub-assembly LH connector.
    2. Disconnect the E8*1 or E5*2 combination meter assembly connector.
      1. *1: for 7 Inch Multi-information Display Type
      2. *2: for 12.3 Inch Multi-information Display Type

      Procedure1

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

      Standard Resistance

      FOR 7 INCH MULTI-INFORMATION DISPLAY TYPE

      Tester Connection Condition Specified Condition
      A52-11 (TNS) - E8-29 (LL) Always Below 1 Ω
      A52-12 (GND) - Body ground Always Below 1 Ω
      FOR 12.3 INCH MULTI-INFORMATION DISPLAY TYPE

      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  15

  15. CHECK NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH 

    Pre-procedure1

    1. Remove the No. 1 headlight ECU sub-assembly LH.

      HINT: 

      Refer to REMOVAL [02/2024 - ]

      GTY1223012Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A for 7 Inch Multi-information Display Type
      *B for 12.3 Inch Multi-information Display Type
      *a Component with harness connected
      (No. 1 Headlight ECU Sub-assembly LH)
      *b Front view of wire harness connector
      (to Combination Meter Assembly)
    2. Reconnect the A52 No. 1 headlight ECU sub-assembly LH connector.

      Procedure1

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

      Standard Resistance

      FOR 7 INCH MULTI-INFORMATION DISPLAY TYPE

      Tester Connection Condition Specified Condition
      E8-29 (LL) - A-20 Always Below 1 Ω
      A-6 - Body ground Always Below 1 Ω
      FOR 12.3 INCH MULTI-INFORMATION DISPLAY TYPE

      Tester Connection Condition Specified Condition
      E5-5 (LL) - A-20 Always Below 1 Ω
      A-6 - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    NG 

    REPLACE NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH 

    Refer to REMOVAL [02/2024 - ]

    Result: 

    OK 

    See step  16

  16. INSPECT HEADLIGHT ASSEMBLY LH 

    Pre-procedure1

    1. Remove the front headlight turn signal light LED (for LH Side).

      HINT: 

      Refer to DISASSEMBLY [02/2024 - ]

      Procedure1

    2. Measure the resistance according to the value(s) in the table below.
      GTY1221036Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 1 Headlight ECU Sub-assembly LH)      		 *b Front view of wire harness connector
      (to Front Headlight Turn Signal Light LED (for LH Side))

      Standard Resistance

      Tester Connection Condition Specified Condition
      A-20 - B-1 Always Below 1 Ω
      A-6 - B-2 Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    3. None

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY 

    Refer to REMOVAL [02/2024 - ]

    Result: 

    NG 

    REPLACE HEADLIGHT ASSEMBLY LH 

    Refer to REMOVAL [02/2024 - ]

  17. CHECK HARNESS AND CONNECTOR (NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH - COMBINATION METER ASSEMBLY AND BODY GROUND) 

    Pre-procedure1

    1. Disconnect the A52 No. 1 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  18

  18. CHECK NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH 

    Pre-procedure1

    1. Remove the No. 1 headlight ECU sub-assembly LH.

      HINT: 

      Refer to REMOVAL [02/2024 - ]

      GTY1226605Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (No. 1 Headlight ECU Sub-assembly LH)
      *b Front view of wire harness connector
      (to Combination Meter Assembly)
    2. Reconnect the A52 No. 1 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-20 Always Below 1 Ω
      A-6 - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    NG 

    REPLACE NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH 

    Refer to REMOVAL [02/2024 - ]

    Result: 

    OK 

    See step  19

  19. CHECK HEADLIGHT ASSEMBLY LH 
    1. Remove the headlight assembly LH and RH.
    2. Interchange the headlight assembly LH and connect the connectors.
    3. Operate the turn signal switch and check that the RH side turn signal light operates normally.

      Result

      Result Proceed to
      Front turn signal light LH operates normally A
      Problem symptoms do not change
      (Front turn signal light LH does not blink)      		 B

    Result: 

    A 

    REPLACE HEADLIGHT ASSEMBLY LH 

    Refer to REMOVAL [02/2024 - ]

    Result: 

    B 

    REPLACE COMBINATION METER ASSEMBLY 

    Refer to REMOVAL [02/2024 - ]

  20. 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 E8*1 or E5*2 combination meter assembly connector.
      1. *1: for 7 Inch Multi-information Display Type
      2. *2: for 12.3 Inch Multi-information Display Type

      Procedure1

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

      Standard Resistance

      FOR 7 INCH MULTI-INFORMATION DISPLAY TYPE

      Tester Connection Condition Specified Condition
      K50-3 (TRN) - E8-32 (TRNR) Always Below 1 Ω
      K50-4 (E) - Body ground Always Below 1 Ω
      FOR 12.3 INCH MULTI-INFORMATION DISPLAY TYPE

      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  21

  21. INSPECT REAR COMBINATION LIGHT SOCKET AND WIRE SUB-ASSEMBLY RH 

    Refer to INSPECTION [02/2024 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE REAR COMBINATION LIGHT SOCKET AND WIRE SUB-ASSEMBLY RH 

    Refer to DISASSEMBLY [02/2024 - ]

    Result: 

    OK 

    See step  22

  22. INSPECT REAR COMBINATION LIGHT LENS AND BODY RH 

    Refer to INSPECTION [02/2024 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY 

    Refer to REMOVAL [02/2024 - ]

    Result: 

    NG 

    REPLACE REAR COMBINATION LIGHT LENS AND BODY RH 

    Refer to REMOVAL [02/2024 - ]

  23. 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 E8*1 or E5*2 combination meter assembly connector.
      1. *1: for 7 Inch Multi-information Display Type
      2. *2: for 12.3 Inch Multi-information Display Type

      Procedure1

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

      Standard Resistance

      FOR 7 INCH MULTI-INFORMATION DISPLAY TYPE

      Tester Connection Condition Specified Condition
      K49-3 (TRN) - E8-31 (TRNL) Always Below 1 Ω
      K49-4 (E) - Body ground Always Below 1 Ω
      FOR 12.3 INCH MULTI-INFORMATION DISPLAY TYPE

      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  24

  24. INSPECT REAR COMBINATION LIGHT SOCKET AND WIRE SUB-ASSEMBLY LH 

    Refer to INSPECTION [02/2024 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE REAR COMBINATION LIGHT SOCKET AND WIRE SUB-ASSEMBLY LH 

    Refer to DISASSEMBLY [02/2024 - ]

    Result: 

    OK 

    See step  25

  25. INSPECT REAR COMBINATION LIGHT LENS AND BODY LH 

    Refer to INSPECTION [02/2024 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY 

    Refer to REMOVAL [02/2024 - ]

    Result: 

    NG 

    REPLACE REAR COMBINATION LIGHT LENS AND BODY LH 

    Refer to REMOVAL [02/2024 - ]

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