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Home >> Lexus >> 2018 >> LS 500 Base, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Meter / Gauge System - Diagnostic Codes (1 Of 2) >> Meter / Gauge System >> DTC B1507-18: Turn Signal Light Circuit Current Below Threshold [10/2020 - 10/2022] >> Procedure

DTC B1507-18: Turn Signal Light Circuit Current Below Threshold [10/2020 - 10/2022]: Procedure

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

      Result

      Result Proceed to
      RH side turn signal light or LH side turn signal light does not illuminate. A
      Front turn signal light LH and side turn signal light LH does not blink. B
      Front turn signal light LH does not blink. C
      Side turn signal light LH does not blink. D
      Rear turn signal light LH does not blink. E
      Front turn signal light RH and side turn signal light RH does not blink. F
      Front turn signal light RH does not blink. G
      Side turn signal light RH does not blink. H
      Rear turn signal light RH does not blink. I

    Result: 

    A 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [10/2020 - 10/2023] 

    Result: 

    C 

    See step  3

    Result: 

    D 

    See step  5

    Result: 

    E 

    See step  8

    Result: 

    F 

    See step  12

    Result: 

    G 

    See step  13

    Result: 

    H 

    See step  15

    Result: 

    I 

    See step  18

    Result: 

    B 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY LH - COMBINATION METER ASSEMBLY OR BODY GROUND) 
    1. Disconnect the A31 headlight ECU sub-assembly LH connector.
    2. Disconnect the G35 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A31-11 (TNS) - G35-13 (LL) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [10/2020 - 10/2023] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  3. CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY LH - COMBINATION METER ASSEMBLY OR BODY GROUND) 
    1. Disconnect the A31 headlight ECU sub-assembly LH connector.
    2. Disconnect the G35 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A31-11 (TNS) - G35-13 (LL) Always Below 1 Ω
      A31-12 (GND) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. CHECK HEADLIGHT ECU SUB-ASSEMBLY LH 
    1. Remove the headlight ECU sub-assembly LH as a unit with the connectors still connected.

      Refer to REMOVAL [10/2020 - ]

      GTY969993Courtesy 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. Disconnect the G35 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      B-20 (TURN+) - G35-13 (LL) Always Below 1 Ω
      B-13 (TURN-) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

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

    Result: 

    NG 

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

  5. CHECK HARNESS AND CONNECTOR (FRONT MULTIPLEX NETWORK DOOR ECU LH - COMBINATION METER ASSEMBLY OR BODY GROUND) 
    1. Disconnect the H31 front multiplex network door ECU LH connector.
    2. Disconnect the G35 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H31-20 (TRNI) - G35-13 (LL) Always Below 1 Ω
      H31-1 (GND) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  6

  6. INSPECT OUTER MIRROR ACTUATOR ASSEMBLY LH 
    1. Remove the outer mirror actuator assembly LH.

      Refer to DISASSEMBLY [12/2017 - 10/2022]

    2. Inspect the outer mirror actuator assembly LH.

      Refer to INSPECTION [12/2017 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE FRONT MULTIPLEX NETWORK DOOR ECU LH. Refer to  DISASSEMBLY [10/2020 - 10/2022] 

    Result: 

    NG 

    See step  7

  7. INSPECT SIDE TURN SIGNAL LIGHT ASSEMBLY LH 
    1. Remove the side turn signal light assembly LH.

      Refer to REMOVAL [10/2020 - ]

    2. Inspect the side turn signal light assembly LH.

      Refer to INSPECTION [12/2017 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

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

    Result: 

    NG 

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

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      L86-9 (B) - G35-11 (TRNL) Always Below 1 Ω
      L82-6 (TRN) - G35-11 (TRNL) Always Below 1 Ω
      L86-1 (E) - Body ground Always Below 1 Ω
      L82-1 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY LH - REAR LIGHT ASSEMBLY LH) 
    1. Disconnect the L86 rear light assembly LH connector.
    2. Disconnect the L82 rear combination light assembly LH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      L82-5 (TRN1) - L86-7 (TRN4) Always Below 1 Ω
      L82-4 (TRN2) - L86-8 (TRN3) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  10

  10. INSPECT REAR COMBINATION LIGHT LH 
    1. Remove the rear combination light LH.

      Refer to REMOVAL [10/2020 - ]

    2. Inspect the rear combination light LH.

      Refer to INSPECTION [12/2017 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE REAR COMBINATION LIGHT LH. Refer to  REMOVAL [10/2020 - ] 

    Result: 

    OK 

    See step  11

  11. INSPECT REAR LIGHT ASSEMBLY LH 
    1. Remove the rear light assembly LH.

      Refer to REMOVAL [12/2017 - ]

    2. Inspect the rear light assembly LH.

      Refer to INSPECTION [12/2017 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [10/2020 - 10/2023] 

    Result: 

    NG 

    REPLACE REAR LIGHT ASSEMBLY LH. Refer to  REMOVAL [12/2017 - ] 

  12. CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY RH - COMBINATION METER ASSEMBLY OR BODY GROUND) 
    1. Disconnect the A32 headlight ECU sub-assembly RH connector.
    2. Disconnect the G35 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A32-11 (TNS) - G35-7 (LR) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [10/2020 - 10/2023] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  13. CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY RH - COMBINATION METER ASSEMBLY OR BODY GROUND) 
    1. Disconnect the A32 headlight ECU sub-assembly RH connector.
    2. Disconnect the G35 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A32-11 (TNS) - G35-7 (LR) Always Below 1 Ω
      A32-12 (GND) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  14

  14. CHECK HEADLIGHT ECU SUB-ASSEMBLY RH 
    1. Remove the headlight ECU sub-assembly RH as a unit with the connectors still connected.

      Refer to REMOVAL [10/2020 - ]

      GTY970044Courtesy 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. Disconnect the G35 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      B-20 (TURN+) - G35-7 (LR) Always Below 1 Ω
      B-13 (TURN-) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

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

    Result: 

    NG 

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

  15. CHECK HARNESS AND CONNECTOR (FRONT MULTIPLEX NETWORK DOOR ECU RH - COMBINATION METER ASSEMBLY OR BODY GROUND) 
    1. Disconnect the H12 front multiplex network door ECU RH connector.
    2. Disconnect the G35 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H12-20 (TRNI) - G35-7 (LR) Always Below 1 Ω
      H12-1 (GND) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  16

  16. INSPECT OUTER MIRROR ACTUATOR ASSEMBLY RH 
    1. Remove the outer mirror actuator assembly RH.

      Refer to DISASSEMBLY [12/2017 - 10/2022]

    2. Inspect the outer mirror actuator assembly RH.

      Refer to INSPECTION [12/2017 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE FRONT MULTIPLEX NETWORK DOOR ECU RH. Refer to  DISASSEMBLY [10/2020 - 10/2022] 

    Result: 

    NG 

    See step  17

  17. INSPECT SIDE TURN SIGNAL LIGHT ASSEMBLY RH 
    1. Remove the side turn signal light assembly RH.

      Refer to REMOVAL [12/2017 - ]

    2. Inspect the side turn signal light assembly RH.

      Refer to INSPECTION [12/2017 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

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

    Result: 

    NG 

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

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      L90-9 (B) - G35-5 (TRNR) Always Below 1 Ω
      L81-6 (TRN) - G35-5 (TRNR) Always Below 1 Ω
      L90-1 (E) - Body ground Always Below 1 Ω
      L81-1 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  19

  19. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY RH - REAR LIGHT ASSEMBLY RH) 
    1. Disconnect the L90 rear light assembly RH connector.
    2. Disconnect the L81 rear combination light assembly RH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      L81-5 (TRN1) - L90-7 (TRN4) Always Below 1 Ω
      L81-4 (TRN2) - L90-8 (TRN3) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  20

  20. INSPECT REAR COMBINATION LIGHT RH 
    1. Remove the rear combination light assembly RH.

      Refer to REMOVAL [10/2020 - ]

    2. Inspect the rear combination light assembly RH.

      Refer to INSPECTION [12/2017 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE REAR COMBINATION LIGHT RH. Refer to  REMOVAL [10/2020 - ] 

    Result: 

    OK 

    See step  21

  21. INSPECT REAR LIGHT ASSEMBLY RH 
    1. Remove the rear light assembly RH.

      Refer to REMOVAL [12/2017 - ]

    2. Inspect the rear light assembly RH.

      Refer to INSPECTION [12/2017 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [10/2020 - 10/2023] 

    Result: 

    NG 

    REPLACE REAR LIGHT ASSEMBLY RH. Refer to  REMOVAL [12/2017 - ] 

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