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Home >> Toyota >> 2025 >> Corolla LE >> Repair and Diagnosis >> Electrical >> Gauges >> Meter / Gauge System (Except 12.3 Inch) - Diagnostic Codes & Symptom Tests (1 Of 2) >> METER / GAUGE SYSTEM (except 12.3 Inch Display) >> DTC B1507-18: Turn Signal Light Circuit Current Below Threshold [09/2022 - 11/2022] >> Procedure

DTC B1507-18: Turn Signal Light Circuit Current Below Threshold [09/2022 - 11/2022]: 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  10

    Result: 

    C 

    See step  19

    Result: 

    D 

    See step  27

    Result: 

    A 

    See step  2

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

      Result

      Result Proceed to
      for TMC Made A
      for TMMC Made B

    Result: 

    B 

    See step  5

    Result: 

    A 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY LH - COMBINATION METER ASSEMBLY AND BODY GROUND) 
    1. Disconnect the A131*1, A134*2 headlight assembly LH connector.
    2. Disconnect the I5 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (LED Type Front Turn Signal Light)

      Tester Connection Condition Specified Condition
      A131-6 (B) - I5-5 (LL) Always Below 1 Ω
      A131-3 (E) - Body ground Always Below 1 Ω

      Standard Resistance (Bulb Type Front Turn Signal Light)

      Tester Connection Condition Specified Condition
      A134-1 (B) - I5-5 (LL) Always Below 1 Ω
      A134-2 (E) - Body ground Always Below 1 Ω
      1. *1: for LED Type Front Turn Signal Light
      2. *2: for Bulb Type Front Turn Signal Light

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. CHECK TURN SIGNAL LIGHT (HEADLIGHT ASSEMBLY LH) 
    1. Remove the headlight assembly LH.

      HINT: 

      Refer to REMOVAL [09/2022 - ]

    2. Remove the Headlight Assembly RH.

      HINT: 

      Refer to REMOVAL [09/2022 - ]

    3. Interchange the Headlight Assembly LH with RH and connect the connectors.
    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

    Result: 

    A 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [09/2022 - 11/2022] 

    Result: 

    B 

    REPLACE HEADLIGHT ASSEMBLY LH. Refer to  REMOVAL [09/2022 - ] 

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

      Result

      Result Proceed to
      LED Type A
      Bulb Type B

    Result: 

    B 

    See step  8

    Result: 

    A 

    See step  6

  6. CHECK LH SIDE FRONT TURN SIGNAL LIGHT (HEADLIGHT ASSEMBLY LH) 
    1. Interchange the headlight assembly LH with RH and connect the connectors.

      Refer to REMOVAL [09/2022 - ]

    2. Operate the turn signal switch and check that the LH side front turn signal light operates normally.

      HINT: 

      If the LH side front turn signal light operates normally, the headlight assembly LH is malfunctioning.

      Result

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

    Result: 

    A 

    REPLACE HEADLIGHT ASSEMBLY LH. Refer to  REMOVAL [09/2022 - ] 

    Result: 

    B 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY LH - COMBINATION METER ASSEMBLY AND BODY GROUND) 
    1. Disconnect the A83 headlight assembly LH connector.
    2. Disconnect the I5 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A83-2 (B) - I5-1 (LL) Always Below 1 Ω
      A83-3 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [09/2022 - 11/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  8. CHECK LH SIDE FRONT TURN SIGNAL LIGHT (FRONT TURN SIGNAL LIGHT SOCKET LH) 
    1. Interchange the front turn signal light socket LH with RH and connect the connectors.

      Refer to DISASSEMBLY [09/2022 - ]

    2. Operate the turn signal switch and check that the LH side front turn signal light operates normally.

      HINT: 

      If the LH side front turn signal light operates normally, the front turn signal light socket LH is malfunctioning.

      Result

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

    Result: 

    A 

    REPLACE FRONT TURN SIGNAL LIGHT SOCKET LH. Refer to  DISASSEMBLY [09/2022 - ] 

    Result: 

    B 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY LH - COMBINATION METER ASSEMBLY AND BODY GROUND) 
    1. Disconnect the A122 headlight assembly LH connector.
    2. Disconnect the I5 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A122-1 (B) - I5-1 (LL) Always Below 1 Ω
      A122-3 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [09/2022 - 11/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

      Result

      Result Proceed to
      for TMC Made A
      for TMMC Made B

    Result: 

    B 

    See step  13

    Result: 

    A 

    See step  11

  11. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY LH - COMBINATION METER ASSEMBLY AND BODY GROUND) 
    1. Disconnect the O104*1, O43*2 rear combination light assembly LH connector.
    2. Disconnect the I5 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (for Sedan)

      Tester Connection Condition Specified Condition
      O104-3 (B) - I5-22 (TRNL) Always Below 1 Ω
      O104-4 (E) - Body ground Always Below 1 Ω

      Standard Resistance (for Hatchback)

      Tester Connection Condition Specified Condition
      O43-4 (B) - I5-22 (TRNL) Always Below 1 Ω
      O43-3 (E) - Body ground Always Below 1 Ω
      1. *1: for Sedan
      2. *2: for Hatchback

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  12

  12. INSPECT REAR COMBINATION LIGHT ASSEMBLY LH 

    for Hatchback: Refer to INSPECTION [09/2022 - ]

    for Sedan: Refer to INSPECTION [01/2019 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [09/2022 - 11/2022] 

    Result: 

    NG 

    REPLACE REAR COMBINATION LIGHT ASSEMBLY LH 

    for Hatchback: Refer to REMOVAL [09/2022 - 11/2022]

    for Sedan: Refer to REMOVAL [03/2019 - ]

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

      Result

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

    Result: 

    B 

    See step  16

    Result: 

    A 

    See step  14

  14. CHECK LH SIDE REAR TURN SIGNAL LIGHT (REAR COMBINATION LIGHT CORD LH) 
    1. Interchange the rear combination light cord LH with RH and connect the connectors.

      Refer to REMOVAL [03/2019 - ]

    2. Operate the turn signal switch and check that the LH side rear turn signal light operates normally.

      HINT: 

      If the LH side rear turn signal lights operates normally, the rear combination light cord LH is malfunctioning.

      Result

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

    Result: 

    A 

    REPLACE REAR COMBINATION LIGHT CORD LH. Refer to  REMOVAL [01/2019 - ] 

    Result: 

    B 

    See step  15

  15. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY LH - COMBINATION METER ASSEMBLY AND BODY GROUND) 
    1. Disconnect the O104 rear combination light assembly LH connector.
    2. Disconnect the I5 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      O104-3 (B) - I5-5 (TRNL) Always Below 1 Ω
      O104-4 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [09/2022 - 11/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  16. CHECK LH SIDE REAR TURN SIGNAL LIGHT (REAR COMBINATION LIGHT ASSEMBLY LH) 
    1. Interchange the rear combination light assembly LH with RH and connect the connectors.

      Refer to REMOVAL [09/2022 - 11/2022]

    2. Operate the turn signal switch and check that the LH side rear turn signal light operates normally.

      HINT: 

      If the LH side rear turn signal lights operates normally, a component of the rear combination light assembly LH is malfunctioning.

      Result

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

    Result: 

    B 

    See step  18

    Result: 

    A 

    See step  17

  17. INSPECT REAR COMBINATION LIGHT LED LH 
    1. Remove the rear combination light LED LH from rear combination light assembly LH.

      Refer to DISASSEMBLY [06/2018 - ]

    2. Inspect the rear combination light LED LH.

      Refer to INSPECTION [09/2022 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [09/2022 - 11/2022] 

    Result: 

    NG 

    REPLACE REAR COMBINATION LIGHT LED LH. Refer to  DISASSEMBLY [06/2018 - ] 

  18. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY LH - COMBINATION METER ASSEMBLY AND BODY GROUND) 
    1. Disconnect the O43 rear combination light assembly LH connector.
    2. Disconnect the I5 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      O43-4 (B) - I5-5 (TRNL) Always Below 1 Ω
      O43-3 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [09/2022 - 11/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

      Result

      Result Proceed to
      for TMC Made A
      for TMMC Made B

    Result: 

    B 

    See step  22

    Result: 

    A 

    See step  20

  20. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY RH - COMBINATION METER ASSEMBLY AND BODY GROUND) 
    1. Disconnect the A133*1, A132*2 headlight assembly RH connector.
    2. Disconnect the I5 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (for LED Type Front Turn Signal Light)

      Tester Connection Condition Specified Condition
      A133-6 (B) - I5-6 (LR) Always Below 1 Ω
      A133-3 (E) - Body ground Always Below 1 Ω

      Standard Resistance (for Bulb Type Front Turn Signal Light)

      Tester Connection Condition Specified Condition
      A132-1 (B) - I5-6 (LR) Always Below 1 Ω
      A132-2 (E) - Body ground Always Below 1 Ω
      1. *1: for LED Type Front Turn Signal Light
      2. *2: for Bulb Type Front Turn Signal Light

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  21

  21. CHECK TURN SIGNAL LIGHT (HEADLIGHT ASSEMBLY RH) 
    1. Remove the headlight assembly RH.

      HINT: 

      Refer to REMOVAL [09/2022 - ]

    2. Remove the Headlight Assembly LH.

      HINT: 

      Refer to REMOVAL [09/2022 - ]

    3. Interchange the Headlight Assembly RH with LH and connect the connectors.
    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

    Result: 

    A 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [09/2022 - 11/2022] 

    Result: 

    B 

    REPLACE HEADLIGHT ASSEMBLY RH. Refer to  REMOVAL [09/2022 - ] 

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

      Result

      Result Proceed to
      LED Type A
      Bulb Type B

    Result: 

    B 

    See step  25

    Result: 

    A 

    See step  23

  23. CHECK RH SIDE FRONT TURN SIGNAL LIGHT (HEADLIGHT ASSEMBLY RH) 
    1. Interchange the headlight assembly RH with LH and connect the connectors.

      Refer to REMOVAL [09/2022 - ]

    2. Operate the turn signal switch and check that the RH side front turn signal light operates normally.

      HINT: 

      If the RH side front turn signal light operates normally, the headlight assembly RH is malfunctioning.

      Result

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

    Result: 

    A 

    REPLACE HEADLIGHT ASSEMBLY RH. Refer to  REMOVAL [09/2022 - ] 

    Result: 

    B 

    See step  24

  24. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY RH - COMBINATION METER ASSEMBLY AND BODY GROUND) 
    1. Disconnect the A82 headlight assembly RH connector.
    2. Disconnect the I5 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A82-2 (B) - I5-2 (LR) Always Below 1 Ω
      A82-3 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [09/2022 - 11/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  25. CHECK RH SIDE FRONT TURN SIGNAL LIGHT (FRONT TURN SIGNAL LIGHT SOCKET RH) 
    1. Interchange the front turn signal light socket RH with LH and connect the connectors.

      Refer to DISASSEMBLY [09/2022 - ]

    2. Operate the turn signal switch and check that the RH side front turn signal light operates normally.

      HINT: 

      If the RH side front turn signal light operates normally, the front turn signal light socket RH is malfunctioning.

      Result

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

    Result: 

    A 

    REPLACE FRONT TURN SIGNAL LIGHT SOCKET RH. Refer to  DISASSEMBLY [09/2022 - ] 

    Result: 

    B 

    See step  26

  26. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY RH - COMBINATION METER ASSEMBLY AND BODY GROUND) 
    1. Disconnect the A121 headlight assembly RH connector.
    2. Disconnect the I5 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A121-1 (B) - I5-2 (LR) Always Below 1 Ω
      A121-3 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [09/2022 - 11/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

      Result

      Result Proceed to
      for TMC Made A
      for TMMC Made B

    Result: 

    B 

    See step  30

    Result: 

    A 

    See step  28

  28. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY RH - COMBINATION METER ASSEMBLY AND BODY GROUND) 
    1. Disconnect the O103*1, O42*2 rear combination light assembly RH connector.
    2. Disconnect the I5 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (for Sedan)

      Tester Connection Condition Specified Condition
      O103-3 (B) - I5-21 (TRNR) Always Below 1 Ω
      O103-4 (E) - Body ground Always Below 1 Ω

      Standard Resistance (for Hatchback)

      Tester Connection Condition Specified Condition
      O42-4 (B) - I5-21 (TRNR) Always Below 1 Ω
      O42-3 (E) - Body ground Always Below 1 Ω
      1. *1: for Sedan
      2. *2: for Hatchback

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  29

  29. INSPECT REAR COMBINATION LIGHT ASSEMBLY RH 

    for Hatchback: Refer to INSPECTION [09/2022 - ]

    for Sedan: Refer to INSPECTION [01/2019 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [09/2022 - 11/2022] 

    Result: 

    NG 

    REPLACE REAR COMBINATION LIGHT ASSEMBLY RH 

    for Hatchback: Refer to REMOVAL [09/2022 - 11/2022]

    for Sedan: Refer to REMOVAL [03/2019 - ]

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

      Result

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

    Result: 

    B 

    See step  33

    Result: 

    A 

    See step  31

  31. CHECK RH SIDE REAR TURN SIGNAL LIGHT (REAR COMBINATION LIGHT CORD RH) 
    1. Interchange the rear combination light cord RH with LH and connect the connectors.

      Refer to REMOVAL [03/2019 - ]

    2. Operate the turn signal switch and check that the RH side rear turn signal light operates normally.

      HINT: 

      If the RH side rear turn signal lights operates normally, the rear combination light cord RH is malfunctioning.

      Result

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

    Result: 

    A 

    REPLACE REAR COMBINATION LIGHT CORD RH. Refer to  REMOVAL [01/2019 - ] 

    Result: 

    B 

    See step  32

  32. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY RH - COMBINATION METER ASSEMBLY AND BODY GROUND) 
    1. Disconnect the O103 rear combination light assembly RH connector.
    2. Disconnect the I5 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      O103-3 (B) - I5-6 (TRNR) Always Below 1 Ω
      O103-4 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [09/2022 - 11/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  33. CHECK RH SIDE REAR TURN SIGNAL LIGHT (REAR COMBINATION LIGHT ASSEMBLY RH) 
    1. Interchange the rear combination light assembly RH with LH and connect the connectors.

      Refer to REMOVAL [09/2022 - 11/2022]

    2. Operate the turn signal switch and check that the RH side rear turn signal light operates normally.

      HINT: 

      If the RH side rear turn signal lights operates normally, a component of the rear combination light assembly RH is malfunctioning.

      Result

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

    Result: 

    B 

    See step  35

    Result: 

    A 

    See step  34

  34. INSPECT REAR COMBINATION LIGHT LED RH 
    1. Remove the rear combination light LED RH from rear combination light assembly RH.

      Refer to DISASSEMBLY [06/2018 - ]

    2. Inspect the rear combination light LED RH.

      Refer to INSPECTION [09/2022 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE REAR COMBINATION LIGHT CORD RH. Refer to  REMOVAL [09/2022 - 11/2022] 

    Result: 

    NG 

    REPLACE REAR COMBINATION LIGHT LED RH. Refer to  DISASSEMBLY [06/2018 - ] 

  35. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY RH - COMBINATION METER ASSEMBLY AND BODY GROUND) 
    1. Disconnect the O42 rear combination light assembly RH connector.
    2. Disconnect the I5 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      O42-4 (B) - I5-6 (TRNR) Always Below 1 Ω
      O42-3 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [09/2022 - 11/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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