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Home >> Lexus >> 2024 >> NX 450h+ Base >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Meter / Gauge System - Diagnostic Codes & Circuit Tests >> Meter / Gauge System >> DTC B1507-18: Turn Signal Light Circuit Current Below Threshold [11/2021 - ] >> Procedure

DTC B1507-18: Turn Signal Light Circuit Current Below Threshold [11/2021 - ]: Procedure

  1. CHECK SYMPTOMS 
    1. Operate the turn signal switch and check the problem symptoms.

      Result

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

    Result: 

    B 

    See step  12

    Result: 

    C 

    See step  15

    Result: 

    D 

    See step  25

    Result: 

    A 

    See step  2

  2. CONFIRM MODEL 
    1. Choose the model to be inspected.

      Result

      Result Proceed to
      w/ Automatic Headlight Beam Level Control System A
      w/o Automatic Headlight Beam Level Control System B

    Result: 

    B 

    See step  10

    Result: 

    A 

    See step  3

  3. INSPECT HEADLIGHT ECU SUB-ASSEMBLY LH 

    Pre-procedure1

    1. Remove the headlight ECU sub-assembly LH from the headlight assembly LH.

      HINT: 

      Refer to REMOVAL [11/2021 - ]

      Procedure1

    2. Measure the resistance according to the value(s) in the table below.
      GTY1071259Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Headlight ECU Sub-assembly LH)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      A49-11 (TNS) - B-20 (TURN+) Always Below 1 Ω
      A49-12 (GND) - B-6 (TURN-) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    3. None

    Result: 

    NG 

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [11/2021 - ] 

    Result: 

    OK 

    See step  4

  4. CONFIRM MODEL 
    1. Choose the model to be inspected.

      Result

      Result Proceed to
      for LED Type Turn Signal Light A
      for Bulb Type Turn Signal Light B

    Result: 

    B 

    See step  7

    Result: 

    A 

    See step  5

  5. CHECK TURN SIGNAL LIGHT (HEADLIGHT TURN SIGNAL LED UNIT LH) 

    Pre-procedure1

    1. Remove the headlight turn signal LED unit LH from the headlight unit assembly LH.

      HINT: 

      Refer to DISASSEMBLY [11/2021 - ]

    2. Remove the headlight turn signal LED unit RH from the headlight unit assembly RH.

      HINT: 

      Refer to DISASSEMBLY [11/2021 - ]

    3. Interchange the headlight turn signal LED unit LH with RH and connect the connectors.

      Procedure1

    4. Check the front turn signal light (LH side) operates normally.

      Result

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

      Post-procedure1

    5. None

    Result: 

    B 

    REPLACE HEADLIGHT TURN SIGNAL LED UNIT LH. Refer to  DISASSEMBLY [11/2021 - ] 

    Result: 

    A 

    See step  6

  6. CHECK TURN SIGNAL LIGHT (HEADLIGHT UNIT ASSEMBLY LH) 

    Pre-procedure1

    1. Remove the headlight unit assembly LH from the headlight assembly LH.

      HINT: 

      Refer to DISASSEMBLY [11/2021 - ]

    2. Remove the headlight unit assembly RH from the headlight assembly RH.

      HINT: 

      Refer to DISASSEMBLY [11/2021 - ]

    3. Interchange the headlight unit assembly LH with RH and connect the connectors.

      Procedure1

    4. Check the front turn signal light (LH side) operates normally.

      Result

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

      Post-procedure1

    5. None

    Result: 

    A 

    See step  9

    Result: 

    B 

    REPLACE HEADLIGHT UNIT ASSEMBLY LH. Refer to  DISASSEMBLY [11/2021 - ] 

  7. CHECK TURN SIGNAL LIGHT (FRONT TURN SIGNAL LIGHT SOCKET AND WIRE LH) 

    Pre-procedure1

    1. Remove the front turn signal light socket and wire LH from the headlight assembly LH.

      HINT: 

      Refer to DISASSEMBLY [11/2021 - ]

    2. Remove the front turn signal light socket and wire RH from the headlight assembly RH.

      HINT: 

      Refer to DISASSEMBLY [11/2021 - ]

    3. Interchange the front turn signal light socket and wire LH with RH and connect the connectors.

      Procedure1

    4. Check the front turn signal light (LH side) operates normally.

      Result

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

      Post-procedure1

    5. None

    Result: 

    B 

    REPLACE FRONT TURN SIGNAL LIGHT SOCKET AND WIRE LH. Refer to  DISASSEMBLY [11/2021 - ] 

    Result: 

    A 

    See step  8

  8. CHECK TURN SIGNAL LIGHT (HEADLIGHT UNIT ASSEMBLY LH) 

    Pre-procedure1

    1. Remove the headlight unit assembly LH from the headlight assembly LH.

      HINT: 

      Refer to DISASSEMBLY [11/2021 - ]

    2. Remove the headlight unit assembly RH from the headlight assembly RH.

      HINT: 

      Refer to DISASSEMBLY [11/2021 - ]

    3. Interchange the headlight unit assembly LH with RH and connect the connectors.

      Procedure1

    4. Check the front turn signal light (LH side) operates normally.

      Result

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

      Post-procedure1

    5. None

    Result: 

    B 

    REPLACE HEADLIGHT UNIT ASSEMBLY LH. Refer to  DISASSEMBLY [11/2021 - ] 

    Result: 

    A 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY LH - COMBINATION METER ASSEMBLY AND BODY GROUND) 

    Pre-procedure1

    1. Disconnect the A49 headlight assembly LH connector.
    2. Disconnect the D22 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
      A49-11 (TNS) - D22-5 (LL) Always Below 1 Ω
      A49-12 (GND) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [11/2021 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  10. CHECK TURN SIGNAL LIGHT (FRONT TURN SIGNAL LIGHT SOCKET LH) 

    Pre-procedure1

    1. Remove the front turn signal light socket LH from the headlight assembly LH.

      HINT: 

      Refer to DISASSEMBLY [11/2021 - ]

    2. Remove the front turn signal light socket RH from the headlight assembly RH.

      HINT: 

      Refer to DISASSEMBLY [11/2021 - ]

    3. Interchange the front turn signal light socket LH with RH and connect the connectors.

      Procedure1

    4. Check the front turn signal light (LH side) operates normally.

      Result

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

      Post-procedure1

    5. None

    Result: 

    B 

    REPLACE FRONT TURN SIGNAL LIGHT SOCKET LH. Refer to  DISASSEMBLY [11/2021 - ] 

    Result: 

    A 

    See step  11

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

    Pre-procedure1

    1. Disconnect the A60 headlight assembly LH connector.
    2. Disconnect the D22 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
      A60-1 (B) - D22-5 (LL) Always Below 1 Ω
      A60-2 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [11/2021 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  12. CHECK TURN SIGNAL LIGHT (REAR COMBINATION LIGHT SOCKET AND WIRE LH) 

    Pre-procedure1

    1. Remove the rear combination light socket and wire LH from the rear combination light assembly LH.

      HINT: 

      Refer to REMOVAL [11/2021 - ]

    2. Remove the rear combination light socket and wire RH from the rear combination light assembly RH.

      HINT: 

      Refer to REMOVAL [11/2021 - ]

    3. Interchange the rear combination light socket and wire LH with RH and connect the connectors.

      Procedure1

    4. Check the rear turn signal light (LH side) operates normally.

      Result

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

      Post-procedure1

    5. None

    Result: 

    B 

    REPLACE REAR COMBINATION LIGHT SOCKET AND WIRE LH. Refer to  REMOVAL [11/2021 - ] 

    Result: 

    A 

    See step  13

  13. CHECK TURN SIGNAL LIGHT (REAR COMBINATION LIGHT LENS AND BODY LH) 

    Pre-procedure1

    1. Remove the rear combination light lens and body LH from the rear combination light assembly LH.

      HINT: 

      Refer to DISASSEMBLY [11/2021 - ]

    2. Remove the rear combination light lens and body RH from the rear combination light assembly RH.

      HINT: 

      Refer to DISASSEMBLY [11/2021 - ]

    3. Interchange the rear combination light lens and body LH with RH and connect the connectors.

      Procedure1

    4. Check the rear turn signal light (LH side) operates normally.

      Result

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

      Post-procedure1

    5. None

    Result: 

    B 

    REPLACE REAR COMBINATION LIGHT LENS AND BODY LH. Refer to  DISASSEMBLY [11/2021 - ] 

    Result: 

    A 

    See step  14

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

    Pre-procedure1

    1. Disconnect the G109 rear combination light assembly LH connector.
    2. Disconnect the D22 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
      G109-6 (TRN) - D22-22 (TRNL) Always Below 1 Ω
      G109-1 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [11/2021 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  15. CONFIRM MODEL 
    1. Choose the model to be inspected.

      Result

      Result Proceed to
      w/ Automatic Headlight Beam Level Control System A
      w/o Automatic Headlight Beam Level Control System B

    Result: 

    B 

    See step  23

    Result: 

    A 

    See step  16

  16. INSPECT HEADLIGHT ECU SUB-ASSEMBLY RH 

    Pre-procedure1

    1. Remove the headlight ECU sub-assembly RH from the headlight assembly RH.

      HINT: 

      Refer to REMOVAL [11/2021 - ]

      Procedure1

    2. Measure the resistance according to the value(s) in the table below.
      GTY1068449Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Headlight ECU Sub-assembly RH)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      A50-11 (TNS) - C-20 (TURN+) Always Below 1 Ω
      A50-12 (GND) - C-6 (TURN-) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    3. None

    Result: 

    NG 

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH. Refer to  REMOVAL [11/2021 - ] 

    Result: 

    OK 

    See step  17

  17. CONFIRM MODEL 
    1. Choose the model to be inspected.

      Result

      Result Proceed to
      for LED Type Turn Signal Light A
      for Bulb Type Turn Signal Light B

    Result: 

    B 

    See step  20

    Result: 

    A 

    See step  18

  18. CHECK TURN SIGNAL LIGHT (HEADLIGHT TURN SIGNAL LED UNIT RH) 

    Pre-procedure1

    1. Remove the headlight turn signal LED unit RH from the headlight unit assembly RH.

      HINT: 

      Refer to DISASSEMBLY [11/2021 - ]

    2. Remove the headlight turn signal LED unit LH from the headlight unit assembly LH.

      HINT: 

      Refer to DISASSEMBLY [11/2021 - ]

    3. Interchange the headlight turn signal LED unit RH with LH and connect the connectors.

      Procedure1

    4. Check the front turn signal light (RH side) operates normally.

      Result

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

      Post-procedure1

    5. None

    Result: 

    B 

    REPLACE HEADLIGHT TURN SIGNAL LED UNIT RH. Refer to  DISASSEMBLY [11/2021 - ] 

    Result: 

    A 

    See step  19

  19. CHECK TURN SIGNAL LIGHT (HEADLIGHT UNIT ASSEMBLY RH) 

    Pre-procedure1

    1. Remove the headlight unit assembly RH from the headlight assembly RH.

      HINT: 

      Refer to DISASSEMBLY [11/2021 - ]

    2. Remove the headlight unit assembly LH from the headlight assembly LH.

      HINT: 

      Refer to DISASSEMBLY [11/2021 - ]

    3. Interchange the headlight unit assembly RH with LH and connect the connectors.

      Procedure1

    4. Check the front turn signal light (RH side) operates normally.

      Result

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

      Post-procedure1

    5. None

    Result: 

    A 

    See step  22

    Result: 

    B 

    REPLACE HEADLIGHT UNIT ASSEMBLY RH. Refer to  DISASSEMBLY [11/2021 - ] 

  20. CHECK TURN SIGNAL LIGHT (FRONT TURN SIGNAL LIGHT SOCKET AND WIRE RH) 

    Pre-procedure1

    1. Remove the front turn signal light socket and wire RH from the headlight assembly RH.

      HINT: 

      Refer to DISASSEMBLY [11/2021 - ]

    2. Remove the front turn signal light socket and wire LH from the headlight assembly LH.

      HINT: 

      Refer to DISASSEMBLY [11/2021 - ]

    3. Interchange the front turn signal light socket and wire RH with LH and connect the connectors.

      Procedure1

    4. Check the front turn signal light (RH side) operates normally.

      Result

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

      Post-procedure1

    5. None

    Result: 

    B 

    REPLACE FRONT TURN SIGNAL LIGHT SOCKET AND WIRE RH. Refer to  DISASSEMBLY [11/2021 - ] 

    Result: 

    A 

    See step  21

  21. CHECK TURN SIGNAL LIGHT (HEADLIGHT UNIT ASSEMBLY RH) 

    Pre-procedure1

    1. Remove the headlight unit assembly RH from the headlight assembly RH.

      HINT: 

      Refer to DISASSEMBLY [11/2021 - ]

    2. Remove the headlight unit assembly LH from the headlight assembly LH.

      HINT: 

      Refer to DISASSEMBLY [11/2021 - ]

    3. Interchange the headlight unit assembly RH with LH and connect the connectors.

      Procedure1

    4. Check the front turn signal light (RH side) operates normally.

      Result

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

      Post-procedure1

    5. None

    Result: 

    B 

    REPLACE HEADLIGHT UNIT ASSEMBLY RH. Refer to  DISASSEMBLY [11/2021 - ] 

    Result: 

    A 

    See step  22

  22. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY RH - COMBINATION METER ASSEMBLY AND BODY GROUND) 

    Pre-procedure1

    1. Disconnect the A50 headlight assembly RH connector.
    2. Disconnect the D22 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
      A50-11 (TNS) - D22-6 (LR) Always Below 1 Ω
      A50-12 (GND) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [11/2021 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  23. CHECK TURN SIGNAL LIGHT (FRONT TURN SIGNAL LIGHT SOCKET RH) 

    Pre-procedure1

    1. Remove the front turn signal light socket RH from the headlight assembly RH.

      HINT: 

      Refer to DISASSEMBLY [11/2021 - ]

    2. Remove the front turn signal light socket LH from the headlight assembly LH.

      HINT: 

      Refer to DISASSEMBLY [11/2021 - ]

    3. Interchange the front turn signal light socket RH with LH and connect the connectors.

      Procedure1

    4. Check the front turn signal light (RH side) operates normally.

      Result

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

      Post-procedure1

    5. None

    Result: 

    B 

    REPLACE FRONT TURN SIGNAL LIGHT SOCKET RH. Refer to  DISASSEMBLY [11/2021 - ] 

    Result: 

    A 

    See step  24

  24. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY RH - COMBINATION METER ASSEMBLY AND BODY GROUND) 

    Pre-procedure1

    1. Disconnect the A59 headlight assembly RH connector.
    2. Disconnect the D22 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
      A59-1 (B) - D22-6 (LR) Always Below 1 Ω
      A59-2 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [11/2021 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  25. CHECK TURN SIGNAL LIGHT (REAR COMBINATION LIGHT SOCKET AND WIRE RH) 

    Pre-procedure1

    1. Remove the rear combination light socket and wire RH from the rear combination light assembly RH.

      HINT: 

      Refer to REMOVAL [11/2021 - ]

    2. Remove the rear combination light socket and wire LH from the rear combination light assembly LH.

      HINT: 

      Refer to REMOVAL [11/2021 - ]

    3. Interchange the rear combination light socket and wire RH with LH and connect the connectors.

      Procedure1

    4. Check the rear turn signal light (RH side) operates normally.

      Result

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

      Post-procedure1

    5. None

    Result: 

    B 

    REPLACE REAR COMBINATION LIGHT SOCKET AND WIRE RH. Refer to  REMOVAL [11/2021 - ] 

    Result: 

    A 

    See step  26

  26. CHECK TURN SIGNAL LIGHT (REAR COMBINATION LIGHT LENS AND BODY RH) 

    Pre-procedure1

    1. Remove the rear combination light lens and body RH from the rear combination light assembly RH.

      HINT: 

      Refer to DISASSEMBLY [11/2021 - ]

    2. Remove the rear combination light lens and body LH from the rear combination light assembly LH.

      HINT: 

      Refer to DISASSEMBLY [11/2021 - ]

    3. Interchange the rear combination light lens and body RH with LH and connect the connectors.

      Procedure1

    4. Check the rear turn signal light (RH side) operates normally.

      Result

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

      Post-procedure1

    5. None

    Result: 

    B 

    REPLACE REAR COMBINATION LIGHT LENS AND BODY RH. Refer to  DISASSEMBLY [11/2021 - ] 

    Result: 

    A 

    See step  27

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

    Pre-procedure1

    1. Disconnect the G18 rear combination light assembly RH connector.
    2. Disconnect the D22 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
      G18-6 (TRN) - D22-21 (TRNR) Always Below 1 Ω
      G18-1 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [11/2021 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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