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Home >> Toyota >> 2020 >> Corolla L >> Repair and Diagnosis >> Electrical >> Gauges >> Meter / Gauge System (Except HEV) - Diagnostic Codes (1 Of 2) >> METER / GAUGE SYSTEM (for Gasoline Model) >> DTC B1507-18: Turn Signal Light Circuit Current Below Threshold [01/2019 - 03/2019] >> Procedure

DTC B1507-18: Turn Signal Light Circuit Current Below Threshold [01/2019 - 03/2019]: Procedure

  1. CHECK SYMPTOMS 
    1. Check the problem symptoms.

      Result

      Result Proceed to
      LH side front turn signal light does not blink A
      LH side rear turn signal light does not blink B
      RH side front turn signal light does not blink C
      RH side rear turn signal light does not blink D

    Result: 

    B 

    See step  11

    Result: 

    C 

    See step  17

    Result: 

    D 

    See step  26

    Result: 

    A 

    See step  2

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

      Result

      Result Proceed to
      Specifications Front Turn Signal Light
      w/ AFS LED Type A
      w/o AFS LED Type B
      Bulb Type C

    Result: 

    B 

    See step  7

    Result: 

    C 

    See step  9

    Result: 

    A 

    See step  3

  3. INSPECT HEADLIGHT CORD (HEADLIGHT UNIT ASSEMBLY LH) 
    GTY900457Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *1 Headlight Cord (Headlight Unit Assembly LH) - -
    *a Component without harness connected
    (Headlight ECU Sub-assembly LH)    		 *b Component without harness connected
    (to Wire Harness)
    1. Disconnect the B, A21 and A23 headlight cord (headlight unit assembly LH) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      B-11 (ECUB) - A21-1 (TNS) Always Below 1 Ω
      B-12 (GND) - A23-4 (GND) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE HEADLIGHT UNIT ASSEMBLY LH. Refer to  DISASSEMBLY [01/2019 - 03/2019] 

    Result: 

    OK 

    See step  4

  4. INSPECT HEADLIGHT ECU SUB-ASSEMBLY LH 
    GTY933376Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component without harness connected
    (Headlight ECU Sub-assembly LH)    		 - -
    1. Remove the headlight ECU sub-assembly LH.

      Refer to REMOVAL [06/2018 - 09/2022]

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      C-20 (TURN+) - B-11 (ECUB) Always Below 1 Ω
      C-13 (TURN-) - B-12 (GND) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [06/2018 - 09/2022] 

    Result: 

    OK 

    See step  5

  5. CHECK LH SIDE FRONT TURN SIGNAL LIGHT (TURN SIGNAL LIGHT (HEADLIGHT UNIT ASSEMBLY LH)) 
    1. Interchange the turn signal light (headlight unit assembly) LH with RH and connect the connectors.

      Refer to DISASSEMBLY [01/2019 - 03/2019]

    2. Connect the headlight cord (headlight unit assembly LH) connectors.
    3. Connect the headlight ECU sub-assembly LH connectors.
    4. 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 turn signal light (headlight unit 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 UNIT ASSEMBLY LH. Refer to  DISASSEMBLY [01/2019 - 03/2019] 

    Result: 

    B 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY LH - COMBINATION METER ASSEMBLY AND BODY GROUND) 
    1. Disconnect the A21 and A23 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
      A21-1 (TNS) - I5-1 (LL) Always Below 1 Ω
      A23-4 (GND) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [01/2019 - 03/2019] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

      Refer to DISASSEMBLY [01/2019 - 03/2019]

    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 unit 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 UNIT ASSEMBLY LH. Refer to  DISASSEMBLY [01/2019 - 03/2019] 

    Result: 

    B 

    See step  8

  8. 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 [01/2019 - 03/2019] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  9. 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 [01/2019 - 03/2019]

    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 [01/2019 - 03/2019] 

    Result: 

    B 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY LH - COMBINATION METER ASSEMBLY AND BODY GROUND) 
    1. Disconnect the A90 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
      A90-1 (B) - I5-1 (LL) Always Below 1 Ω
      A90-2 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [01/2019 - 03/2019] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  11. 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  14

    Result: 

    A 

    See step  12

  12. 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 [01/2019 - 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  13

  13. 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 [01/2019 - 03/2019] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  14. 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 [06/2018 - 09/2022]

    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  16

    Result: 

    A 

    See step  15

  15. 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 [06/2018 - 09/2022]

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE REAR COMBINATION LIGHT CORD LH. Refer to  REMOVAL [06/2018 - 09/2022] 

    Result: 

    NG 

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

  16. 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 [01/2019 - 03/2019] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

      Result

      Result Proceed to
      Specifications Front Turn Signal Light
      w/ AFS LED Type A
      w/o AFS LED Type B
      Bulb Type C

    Result: 

    B 

    See step  22

    Result: 

    C 

    See step  24

    Result: 

    A 

    See step  18

  18. INSPECT HEADLIGHT CORD (HEADLIGHT UNIT ASSEMBLY RH) 
    GTY900451Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *1 Headlight Cord (Headlight Unit Assembly RH) - -
    *a Component without harness connected
    (Headlight ECU Sub-assembly RH)    		 *b Component without harness connected
    (to Wire Harness)
    1. Disconnect the D, A20 and A22 headlight cord (headlight unit assembly RH) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D-11 (ECUB) - A20-1 (TNS) Always Below 1 Ω
      D-12 (GND) - A22-4 (GND) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE HEADLIGHT UNIT ASSEMBLY RH. Refer to  DISASSEMBLY [01/2019 - 03/2019] 

    Result: 

    OK 

    See step  19

  19. INSPECT HEADLIGHT ECU SUB-ASSEMBLY RH 
    GTY870882Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component without harness connected
    (Headlight ECU Sub-assembly RH)    		 - -
    1. Remove the headlight ECU sub-assembly RH.

      Refer to REMOVAL [06/2018 - 09/2022]

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      E-20 (TURN+) - D-11 (ECUB) Always Below 1 Ω
      E-13 (TURN-) - D-12 (GND) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH. Refer to  REMOVAL [06/2018 - 09/2022] 

    Result: 

    OK 

    See step  20

  20. CHECK RH SIDE FRONT TURN SIGNAL LIGHT (TURN SIGNAL LIGHT (HEADLIGHT UNIT ASSEMBLY RH)) 
    1. Interchange the turn signal light (headlight unit assembly) RH with LH and connect the connectors.

      Refer to DISASSEMBLY [01/2019 - 03/2019]

    2. Connect the headlight cord (headlight unit assembly RH) connectors.
    3. Connect the headlight ECU sub-assembly RH connectors.
    4. 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 turn signal light (headlight unit 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 UNIT ASSEMBLY RH. Refer to  DISASSEMBLY [01/2019 - 03/2019] 

    Result: 

    B 

    See step  21

  21. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY RH - COMBINATION METER ASSEMBLY AND BODY GROUND) 
    1. Disconnect the A20 and A22 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
      A20-1 (TNS) - I5-2 (LR) Always Below 1 Ω
      A22-4 (GND) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [01/2019 - 03/2019] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

      Refer to REMOVAL [01/2019 - 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 unit 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 UNIT ASSEMBLY RH. Refer to  DISASSEMBLY [01/2019 - 03/2019] 

    Result: 

    B 

    See step  23

  23. 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 [01/2019 - 03/2019] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  24. 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 [01/2019 - 03/2019]

    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 [01/2019 - 03/2019] 

    Result: 

    B 

    See step  25

  25. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY RH - COMBINATION METER ASSEMBLY AND BODY GROUND) 
    1. Disconnect the A87 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
      A87-1 (B) - I5-2 (LR) Always Below 1 Ω
      A87-2 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [01/2019 - 03/2019] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  26. 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  29

    Result: 

    A 

    See step  27

  27. 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 [01/2019 - 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  28

  28. 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 [01/2019 - 03/2019] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  29. 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 [06/2018 - 09/2022]

    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  31

    Result: 

    A 

    See step  30

  30. 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 [06/2018 - 09/2022]

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE REAR COMBINATION LIGHT CORD RH. Refer to  REMOVAL [06/2018 - 09/2022] 

    Result: 

    NG 

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

  31. 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 [01/2019 - 03/2019] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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