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Home >> Toyota >> 2022 >> Corolla LE >> Repair and Diagnosis >> Electrical >> Gauges >> Meter / Gauge System (Except HEV) - Diagnostic Codes (1 Of 2) >> METER / GAUGE SYSTEM (for Gasoline Model) >> DTC B1508-19: Turn Signal/Hazard Flasher Circuit Current Above Threshold [06/2018 - 01/2019] >> Procedure

DTC B1508-19: Turn Signal/Hazard Flasher Circuit Current Above Threshold [06/2018 - 01/2019]: Procedure

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

      Result

      Result Proceed to
      All LH turn signal lights do not blink A
      All RH turn signal lights do not blink B

    Result: 

    B 

    See step  14

    Result: 

    A 

    See step  2

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

      Result

      Result Proceed to
      w/ AFS A
      w/o AFS B

    Result: 

    B 

    See step  7

    Result: 

    A 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY LH AND OUTER REAR VIEW MIRROR ASSEMBLY LH - COMBINATION METER ASSEMBLY) 
    1. Disconnect the A21 headlight assembly LH connector.
    2. Disconnect the L9 outer rear view mirror assembly LH connector.
    3. Disconnect the I5 combination meter assembly connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A21-1 (TNS), L9-5 (B) or I5-1 (LL) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. CHECK LH SIDE LIGHTS (HEADLIGHT ASSEMBLY LH) 
    1. Connect the L9 outer rear view mirror assembly LH connector.
    2. Connect the I5 combination meter assembly connector.
    3. Operate the turn signal switch and check that the LH side turn signal lights other than the front turn signal light blink.

      HINT: 

      If the LH side turn signal lights blink, the headlight assembly LH is malfunctioning.

      Result

      Result Proceed to
      LH side turn signal lights blink A
      LH side turn signal lights do not blink B

    Result: 

    B 

    See step  9

    Result: 

    A 

    See step  5

  5. CHECK LH SIDE LIGHTS (HEADLIGHT CORD (HEADLIGHT UNIT ASSEMBLY LH)) 
    1. Remove the headlight cord (headlight unit assembly LH).

      Refer to DISASSEMBLY [06/2018 - 01/2019]

    2. Connect the A21 headlight assembly LH connector.
    3. Operate the turn signal switch and check that the LH side turn signal lights other than the front turn signal light blink.

      HINT: 

      If the LH side turn signal lights blink, the headlight ECU sub-assembly LH or turn signal light (headlight unit assembly LH) are malfunctioning.

      Result

      Result Proceed to
      LH side turn signal lights blink A
      LH side turn signal lights do not blink B

    Result: 

    B 

    REPLACE HEADLIGHT UNIT ASSEMBLY LH. Refer to  DISASSEMBLY [06/2018 - 01/2019] 

    Result: 

    A 

    See step  6

  6. CHECK LH SIDE LIGHTS (HEADLIGHT ECU SUB-ASSEMBLY LH) 
    1. Remove the headlight ECU sub-assembly LH.

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

    2. Connect the A headlight ECU sub-assembly LH connector.
    3. Operate the turn signal switch and check that the LH side turn signal lights other than the front turn signal light blink.

      HINT: 

      If the LH side turn signal lights blink, the turn signal light (headlight unit assembly LH) is malfunctioning.

      Result

      Result Proceed to
      LH side turn signal lights blink A
      LH side turn signal lights do not blink B

    Result: 

    A 

    REPLACE HEADLIGHT UNIT ASSEMBLY LH. Refer to  DISASSEMBLY [06/2018 - 01/2019] 

    Result: 

    B 

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

  7. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY LH AND OUTER REAR VIEW MIRROR ASSEMBLY LH - COMBINATION METER ASSEMBLY) 
    1. Disconnect the A83 headlight assembly LH connector.
    2. Disconnect the L9 outer rear view mirror assembly LH connector.
    3. Disconnect the I5 combination meter assembly connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A83-2 (B), L9-5 (B) or I5-1 (LL) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

  8. CHECK LH SIDE LIGHTS (HEADLIGHT ASSEMBLY LH) 
    1. Connect the L9 outer rear view mirror assembly LH connector.
    2. Connect the I5 combination meter assembly connector.
    3. Operate the turn signal switch and check that the LH side turn signal lights other than the front turn signal light blink.

      HINT: 

      If the LH side turn signal lights blink, the headlight assembly LH is malfunctioning.

      Result

      Result Proceed to
      LH side turn signal lights blink A
      LH side turn signal lights do not blink B

    Result: 

    A 

    REPLACE HEADLIGHT UNIT ASSEMBLY LH. Refer to  DISASSEMBLY [06/2018 - 01/2019] 

    Result: 

    B 

    See step  9

  9. CHECK LH SIDE LIGHTS (OUTER REAR VIEW MIRROR ASSEMBLY LH) 
    1. Connect the A21*1 or A83*2 headlight assembly LH connector.
      1. *1: w/ AFS
      2. *2: w/o AFS
    2. Disconnect the L9 outer rear view mirror assembly LH connector.
    3. Operate the turn signal switch and check that the LH side turn signal lights other than the side turn signal light blink.

      HINT: 

      If the LH side turn signal lights blink, the outer rear view mirror assembly LH is malfunctioning.

      Result

      Result Proceed to
      LH side turn signal lights blink A
      LH side turn signal lights do not blink B

    Result: 

    B 

    See step  11

    Result: 

    A 

    See step  10

  10. CHECK LH SIDE LIGHTS (SIDE TURN SIGNAL LIGHT ASSEMBLY LH) 
    1. Remove the side turn signal light assembly LH from outer rear view mirror assembly LH.

      Refer to REMOVAL [06/2018 - ]

    2. Connect the L9 outer rear view mirror assembly LH connector.
    3. Operate the turn signal switch and check that the LH side turn signal lights other than the side turn signal light blink.

      HINT: 

      If the LH side turn signal lights blink, the side turn signal light assembly LH is malfunctioning.

      Result

      Result Proceed to
      LH side turn signal lights blink A
      LH side turn signal lights do not blink B

    Result: 

    A 

    REPLACE SIDE TURN SIGNAL LIGHT ASSEMBLY LH. Refer to  REMOVAL [06/2018 - ] 

    Result: 

    B 

    REPLACE OUTER REAR VIEW MIRROR ASSEMBLY LH. Refer to  REMOVAL [06/2018 - ] 

  11. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY LH - COMBINATION METER ASSEMBLY) 
    1. Connect the L9 outer rear view mirror assembly LH connector.
    2. Disconnect the O43 rear combination light assembly LH connector.
    3. Disconnect the I5 combination meter assembly connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      O43-4 (B) or I5-5 (TRNL) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  12

  12. CHECK LH SIDE LIGHTS (REAR COMBINATION LIGHT ASSEMBLY LH) 
    1. Connect the I5 combination meter assembly connector.
    2. Operate the turn signal switch and check that the LH side turn signal lights other than the rear turn signal light blink.

      HINT: 

      If the LH side turn signal lights blink, the rear combination light assembly LH is malfunctioning.

      Result

      Result Proceed to
      LH side turn signal lights blink A
      LH side turn signal lights do not blink B

    Result: 

    B 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [06/2018 - 01/2019] 

    Result: 

    A 

    See step  13

  13. CHECK LH SIDE LIGHTS (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. Connect the O43 rear combination light assembly LH connector.
    3. Operate the turn signal switch and check that the LH side turn signal lights other than the rear turn signal light blink.

      HINT: 

      If the LH side turn signal lights blink, the rear combination light LED LH is malfunctioning.

      Result

      Result Proceed to
      LH side turn signal lights blink A
      LH side turn signal lights do not blink B

    Result: 

    A 

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

    Result: 

    B 

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

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

      Result

      Result Proceed to
      w/ AFS A
      w/o AFS B

    Result: 

    B 

    See step  19

    Result: 

    A 

    See step  15

  15. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY RH AND OUTER REAR VIEW MIRROR ASSEMBLY RH - COMBINATION METER ASSEMBLY) 
    1. Disconnect the A20 headlight assembly RH connector.
    2. Disconnect the K10 outer rear view mirror assembly RH connector.
    3. Disconnect the I5 combination meter assembly connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A20-1 (TNS), K10-5 (B) or I5-2 (LR) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  16

  16. CHECK RH SIDE LIGHTS (HEADLIGHT ASSEMBLY RH) 
    1. Connect the K10 outer rear view mirror assembly RH connector.
    2. Connect the I5 combination meter assembly connector.
    3. Operate the turn signal switch and check that the RH side turn signal lights other than the front turn signal light blink.

      HINT: 

      If the RH side turn signal lights blink, the headlight assembly RH is malfunctioning.

      Result

      Result Proceed to
      RH side turn signal lights blink A
      RH side turn signal lights do not blink B

    Result: 

    B 

    See step  21

    Result: 

    A 

    See step  17

  17. CHECK RH SIDE LIGHTS (HEADLIGHT CORD (HEADLIGHT UNIT ASSEMBLY RH)) 
    1. Remove the headlight cord (headlight unit assembly RH).

      Refer to DISASSEMBLY [06/2018 - 01/2019]

    2. Connect the A20 headlight assembly RH connector.
    3. Operate the turn signal switch and check that the RH side turn signal lights other than the front turn signal light blink.

      HINT: 

      If the RH side turn signal lights blink, the headlight ECU sub-assembly RH or turn signal light (headlight unit assembly RH) are malfunctioning.

      Result

      Result Proceed to
      RH side turn signal lights blink A
      RH side turn signal lights do not blink B

    Result: 

    B 

    REPLACE HEADLIGHT UNIT ASSEMBLY RH. Refer to  DISASSEMBLY [06/2018 - 01/2019] 

    Result: 

    A 

    See step  18

  18. CHECK RH SIDE LIGHTS (HEADLIGHT ECU SUB-ASSEMBLY RH) 
    1. Remove the headlight ECU sub-assembly RH.

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

    2. Connect the C headlight ECU sub-assembly RH connector.
    3. Operate the turn signal switch and check that the RH side turn signal lights other than the front turn signal light blink.

      HINT: 

      If the RH side turn signal lights blink, the turn signal light (headlight unit assembly RH) is malfunctioning.

      Result

      Result Proceed to
      RH side turn signal lights blink A
      RH side turn signal lights do not blink B

    Result: 

    A 

    REPLACE HEADLIGHT UNIT ASSEMBLY RH. Refer to  DISASSEMBLY [06/2018 - 01/2019] 

    Result: 

    B 

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

  19. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY RH AND OUTER REAR VIEW MIRROR ASSEMBLY RH - COMBINATION METER ASSEMBLY) 
    1. Disconnect the A82 headlight assembly RH connector.
    2. Disconnect the K10 outer rear view mirror assembly RH connector.
    3. Disconnect the I5 combination meter assembly connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A82-2 (B), K10-5 (B) or I5-2 (LR) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  20

  20. CHECK RH SIDE LIGHTS (HEADLIGHT ASSEMBLY RH) 
    1. Connect the K10 outer rear view mirror assembly RH connector.
    2. Connect the I5 combination meter assembly connector.
    3. Operate the turn signal switch and check that the RH side turn signal lights other than the front turn signal light blink.

      HINT: 

      If the RH side turn signal lights blink, the headlight assembly RH is malfunctioning.

      Result

      Result Proceed to
      RH side turn signal lights blink A
      RH side turn signal lights do not blink B

    Result: 

    A 

    REPLACE HEADLIGHT UNIT ASSEMBLY RH. Refer to  DISASSEMBLY [06/2018 - 01/2019] 

    Result: 

    B 

    See step  21

  21. CHECK RH SIDE LIGHTS (OUTER REAR VIEW MIRROR ASSEMBLY RH) 
    1. Connect the A20*1 or A82*2 headlight assembly RH connector.
      1. *1: w/ AFS
      2. *2: w/o AFS
    2. Disconnect the K10 outer rear view mirror assembly RH connector.
    3. Operate the turn signal switch and check that the RH side turn signal lights other than the side turn signal light blink.

      HINT: 

      If the RH side turn signal lights blink, the outer rear view mirror assembly RH is malfunctioning.

      Result

      Result Proceed to
      RH side turn signal lights blink A
      RH side turn signal lights do not blink B

    Result: 

    B 

    See step  23

    Result: 

    A 

    See step  22

  22. CHECK RH SIDE LIGHTS (SIDE TURN SIGNAL LIGHT ASSEMBLY RH) 
    1. Remove the side turn signal light assembly RH from outer rear view mirror assembly RH.

      Refer to REMOVAL [06/2018 - ]

    2. Connect the K10 outer rear view mirror assembly RH connector.
    3. Operate the turn signal switch and check that the RH side turn signal lights other than the side turn signal light blink.

      HINT: 

      If the RH side turn signal lights blink, the side turn signal light assembly RH is malfunctioning.

      Result

      Result Proceed to
      RH side turn signal lights blink A
      RH side turn signal lights do not blink B

    Result: 

    A 

    REPLACE SIDE TURN SIGNAL LIGHT ASSEMBLY RH. Refer to  REMOVAL [06/2018 - ] 

    Result: 

    B 

    REPLACE OUTER REAR VIEW MIRROR ASSEMBLY RH. Refer to  REMOVAL [06/2018 - ] 

  23. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY RH - COMBINATION METER ASSEMBLY) 
    1. Connect the K10 outer rear view mirror assembly RH connector.
    2. Disconnect the O42 rear combination light assembly RH connector.
    3. Disconnect the I5 combination meter assembly connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      O42-4 (B) or I5-6 (TRNR) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  24

  24. CHECK RH SIDE LIGHTS (REAR COMBINATION LIGHT ASSEMBLY RH) 
    1. Connect the I5 combination meter assembly connector.
    2. Operate the turn signal switch and check that the RH side turn signal lights other than the rear turn signal light blink.

      HINT: 

      If the RH side turn signal lights blink, the rear combination light assembly RH is malfunctioning.

      Result

      Result Proceed to
      RH side turn signal lights blink A
      RH side turn signal lights do not blink B

    Result: 

    B 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [06/2018 - 01/2019] 

    Result: 

    A 

    See step  25

  25. CHECK RH SIDE LIGHTS (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. Connect the O42 rear combination light assembly RH connector.
    3. Operate the turn signal switch and check that the RH side turn signal lights other than the rear turn signal light blink.

      HINT: 

      If the RH side turn signal lights blink, the rear combination light LED RH is malfunctioning.

      Result

      Result Proceed to
      RH side turn signal lights blink A
      RH side turn signal lights do not blink B

    Result: 

    A 

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

    Result: 

    B 

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

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