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DTC B1507-18: Turn Signal Light Circuit Current Below Threshold [06/2020 - 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  5

    Result: 

    C 

    See step  8

    Result: 

    D 

    See step  13

    Result: 

    E 

    See step  18

    Result: 

    F 

    See step  20

    Result: 

    G 

    See step  22

    Result: 

    H 

    See step  24

    Result: 

    A 

    See step  2

  2. CHECK VEHICLE TYPE 
    1. Check for vehicle type.

      Result

      Result Proceed to
      w/ Headlight ECU A
      w/o Headlight ECU B

    Result: 

    B 

    See step  4

    Result: 

    A 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH) 
    1. Disconnect the G19 combination meter assembly connector.
    2. Disconnect the A11 No. 1 headlight ECU sub-assembly LH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G19-1 (LL) - A11-11 (TNS) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [06/2020 - 10/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  4. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - FRONT TURN SIGNAL LIGHT SOCKET LH) 
    1. Disconnect the G19 combination meter assembly connector.
    2. Disconnect the A60 front turn signal light socket LH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G19-1 (LL) - A60-1 (B) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [06/2020 - 10/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  5. CHECK VEHICLE TYPE 
    1. Check for vehicle type.

      Result

      Result Proceed to
      w/ Headlight ECU A
      w/o Headlight ECU B

    Result: 

    B 

    See step  7

    Result: 

    A 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH) 
    1. Disconnect the G19 combination meter assembly connector.
    2. Disconnect the A12 No. 1 headlight ECU sub-assembly RH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G19-2 (LR) - A12-11 (TNS) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [06/2020 - 10/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  7. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - FRONT TURN SIGNAL LIGHT SOCKET RH) 
    1. Disconnect the G19 combination meter assembly connector.
    2. Disconnect the A59 front turn signal light socket RH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G19-1 (LL) - A59-1 (B) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [06/2020 - 10/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  8. CHECK VEHICLE TYPE 
    1. Check for vehicle type.

      Result

      Result Proceed to
      w/ Headlight ECU A
      w/o Headlight ECU B

    Result: 

    B 

    See step  12

    Result: 

    A 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH) 
    1. Disconnect the G19 combination meter assembly connector.
    2. Disconnect the A11 No. 1 headlight ECU sub-assembly LH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G19-1 (LL) - A11-11 (TNS) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  10

  10. INSPECT HEADLIGHT UNIT ASSEMBLY LH 
    1. Remove the No. 1 headlight ECU Sub-assembly LH.

      Refer to DISASSEMBLY [06/2020 - 12/2021]

      GTY983345Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (to No. 1 Headlight ECU Sub-assembly LH)
      *b Component without harness connected
      (to Front Turn Signal Light Socket)
    2. Remove the front turn signal light socket.

      Refer to DISASSEMBLY [06/2020 - 12/2021]

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      A-9 - B-1 Always Below 1 Ω
      A-13 - B-2 Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE HEADLIGHT UNIT ASSEMBLY LH. Refer to  DISASSEMBLY [06/2020 - 12/2021] 

    Result: 

    OK 

    See step  11

  11. INSPECT FRONT TURN SIGNAL LIGHT SOCKET 
    1. Remove the No. 1 headlight ECU sub-assembly LH.

      Refer to REMOVAL [06/2020 - 12/2021]

      GTY983438Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (to No. 1 Headlight ECU Sub-assembly LH)
    2. Apply auxiliary battery voltage to the headlight unit assembly LH and check that the light illuminates.

      OK

      Condition Specified Condition
      Auxiliary battery positive (+) → A-9
      Auxiliary battery negative (-) → A-13      		 Turn signal light illuminates

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [06/2020 - 12/2021] 

    Result: 

    NG 

    REPLACE FRONT TURN SIGNAL LIGHT SOCKET. Refer to  DISASSEMBLY [06/2020 - 12/2021] 

  12. CHECK HARNESS AND CONNECTOR (FRONT TURN SIGNAL LIGHT SOCKET LH - COMBINATION METER ASSEMBLY AND BODY GROUND) 
    1. Disconnect the G19 combination meter assembly connector.
    2. Disconnect the A60 front turn signal light socket LH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G19-1 (LL) - A60-1 (B) Always Below 1 Ω
      A60-2 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE FRONT TURN SIGNAL LIGHT SOCKET LH. Refer to  DISASSEMBLY [06/2020 - 12/2021] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  13. CHECK VEHICLE TYPE 
    1. Check for vehicle type.

      Result

      Result Proceed to
      w/ Headlight ECU A
      w/o Headlight ECU B

    Result: 

    B 

    See step  17

    Result: 

    A 

    See step  14

  14. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH) 
    1. Disconnect the G19 combination meter assembly connector.
    2. Disconnect the A12 No. 1 headlight ECU sub-assembly RH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G19-2 (LR) - A12-11 (TNS) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  15

  15. INSPECT HEADLIGHT UNIT ASSEMBLY RH 
    1. Remove the No. 1 headlight ECU Sub-assembly RH.

      Refer to DISASSEMBLY [06/2020 - 12/2021]

      GTY983345Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (to No. 1 Headlight ECU Sub-assembly RH)
      *b Component without harness connected
      (to Front Turn Signal Light Socket)
    2. Remove the front turn signal light socket.

      Refer to DISASSEMBLY [06/2020 - 12/2021]

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      A-9 - B-1 Always Below 1 Ω
      A-13 - B-2 Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE HEADLIGHT UNIT ASSEMBLY RH. Refer to  DISASSEMBLY [06/2020 - 12/2021] 

    Result: 

    OK 

    See step  16

  16. INSPECT FRONT TURN SIGNAL LIGHT SOCKET 
    1. Remove the No. 1 headlight ECU sub-assembly RH.

      Refer to REMOVAL [06/2020 - 12/2021]

      GTY983438Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (to No. 1 Headlight ECU Sub-assembly RH)
    2. Apply auxiliary battery voltage to the headlight unit assembly RH and check that the light illuminates.

      OK

      Condition Specified Condition
      Auxiliary battery positive (+) → A-9
      Auxiliary battery negative (-) → A-13      		 Turn signal light illuminates

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH. Refer to  REMOVAL [06/2020 - 12/2021] 

    Result: 

    NG 

    REPLACE FRONT TURN SIGNAL LIGHT SOCKET. Refer to  DISASSEMBLY [06/2020 - 12/2021] 

  17. CHECK HARNESS AND CONNECTOR (FRONT TURN SIGNAL LIGHT SOCKET RH - COMBINATION METER ASSEMBLY AND BODY GROUND) 
    1. Disconnect the G19 combination meter assembly connector.
    2. Disconnect the A59 front turn signal light socket RH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G19-1 (LL) - A59-1 (B) Always Below 1 Ω
      A59-2 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE FRONT TURN SIGNAL LIGHT SOCKET RH. Refer to  DISASSEMBLY [06/2020 - 12/2021] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  18. INSPECT OUTER REAR VIEW MIRROR ASSEMBLY LH 

    Refer to INSPECTION [06/2020 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    NG 

    See step  19

  19. INSPECT SIDE TURN SIGNAL LIGHT ASSEMBLY LH 

    Refer to INSPECTION [06/2020 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE OUTER REAR VIEW MIRROR ASSEMBLY LH. Refer to  REMOVAL [06/2020 - ] 

    Result: 

    NG 

    REPLACE SIDE TURN SIGNAL LIGHT ASSEMBLY LH. Refer to  REMOVAL [06/2020 - ] 

  20. INSPECT OUTER REAR VIEW MIRROR ASSEMBLY RH 

    Refer to INSPECTION [06/2020 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    NG 

    See step  21

  21. INSPECT SIDE TURN SIGNAL LIGHT ASSEMBLY RH 

    Refer to INSPECTION [06/2020 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE OUTER REAR VIEW MIRROR ASSEMBLY RH. Refer to  REMOVAL [06/2020 - ] 

    Result: 

    NG 

    REPLACE SIDE TURN SIGNAL LIGHT ASSEMBLY RH. Refer to  REMOVAL [06/2020 - ] 

  22. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT SOCKET AND WIRE LH - COMBINATION METER ASSEMBLY AND BODY GROUND) 
    1. Disconnect the N18 rear combination light socket and wire LH connector.
    2. Disconnect the G19 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      N18-4 (TRN) - G19-5 (TRNL) Always Below 1 Ω
      N18-3 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  23

  23. INSPECT REAR COMBINATION LIGHT SOCKET AND WIRE LH 
    1. Disconnect the N18 rear combination light socket and wire LH connector.
      GTY926047Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Rear Combination Light Socket and Wire LH)
    2. Apply auxiliary battery voltage to the rear combination light socket and wire LH and check that the light illuminates.

      OK

      Condition Specified Condition
      Auxiliary battery positive (+) → Terminal 4 (TRN)
      Auxiliary battery negative (-) → Terminal 3 (E)      		 Turn signal light illuminates

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [06/2020 - 10/2022] 

    Result: 

    NG 

    REPLACE REAR COMBINATION LIGHT SOCKET AND WIRE. Refer to  DISASSEMBLY [06/2020 - ] 

  24. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT SOCKET AND WIRE RH - COMBINATION METER ASSEMBLY AND BODY GROUND) 
    1. Disconnect the M14 rear combination light socket and wire RH connector.
    2. Disconnect the G19 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      M14-4 (TRN) - G19-6 (TRNR) Always Below 1 Ω
      M14-3 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  25

  25. INSPECT REAR COMBINATION LIGHT SOCKET AND WIRE RH 
    1. Disconnect the M14 rear combination light socket and wire RH connector.
      GTY926047Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Rear Combination Light Socket and Wire RH)
    2. Apply auxiliary battery voltage to the rear combination light socket and wire RH and check that the light illuminates.

      OK

      Condition Specified Condition
      Auxiliary battery positive (+) → Terminal 4 (TRN)
      Auxiliary battery negative (-) → Terminal 3 (E)      		 Turn signal light illuminates

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [06/2020 - 10/2022] 

    Result: 

    NG 

    REPLACE REAR COMBINATION LIGHT SOCKET AND WIRE. Refer to  DISASSEMBLY [06/2020 - ] 

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