LEMON Manuals: Even more car manuals for everyone
Home >> Toyota >> 2020 >> Corolla L >> Repair and Diagnosis >> External Pages >> Different car >> Section 324 (Meter / Gauge System (12.3 Inch) - Diagnostic Codes, Symptom Tests & Circuit Tests) >> METER / GAUGE SYSTEM (for 12.3 Inch Display) >> DTC B1507-18: Turn Signal Light Circuit Current Below Threshold [09/2022 - ] >> Procedure

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

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2025 Toyota GR Corolla, 2025 Toyota Corolla, 2024 Toyota GR Corolla, 2024 Toyota Corolla, and 2023 Toyota GR Corolla. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECT LIGHTS 
    1. Inspect the illumination of each turn signal light.

      Result

      Result Proceed to
      Front turn signal light LH does not blink A
      Rear turn signal light LH does not blink B
      Front turn signal light RH does not blink C
      Rear turn signal light RH does not blink D

    Result: 

    B 

    See step  4

    Result: 

    C 

    See step  6

    Result: 

    D 

    See step  8

    Result: 

    A 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY LH - COMBINATION METER ASSEMBLY AND BODY GROUND) 
    1. Disconnect the A170 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
      A170-6 (B) - I5-5 (LL) Always Below 1 Ω
      A170-3 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  3

  3. 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] , or refer to REMOVAL [11/2022 - 09/2024] , or refer to REMOVAL [09/2024 - ]

    Result: 

    B 

    REPLACE HEADLIGHT ASSEMBLY LH 

    Refer to REMOVAL [09/2022 - ]

  4. 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) - I5-22 (TRNL) Always Below 1 Ω
      O43-3 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. INSPECT REAR COMBINATION LIGHT ASSEMBLY LH 

    Refer to INSPECTION [09/2022 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY 

    Refer to REMOVAL [09/2022 - 11/2022] , or refer to REMOVAL [11/2022 - 09/2024] , or refer to REMOVAL [09/2024 - ]

    Result: 

    NG 

    REPLACE REAR COMBINATION LIGHT ASSEMBLY LH 

    Refer to REMOVAL [09/2022 - 11/2022] , or refer to REMOVAL [11/2022 - ]

  6. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY RH - COMBINATION METER ASSEMBLY AND BODY GROUND) 
    1. Disconnect the A171 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
      A171-6 (B) - I5-6 (LR) Always Below 1 Ω
      A171-3 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  7

  7. 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] , or refer to REMOVAL [11/2022 - 09/2024] , or refer to REMOVAL [09/2024 - ]

    Result: 

    B 

    REPLACE HEADLIGHT ASSEMBLY RH 

    Refer to REMOVAL [09/2022 - ]

  8. 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) - I5-21 (TRNR) Always Below 1 Ω
      O42-3 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  9

  9. INSPECT REAR COMBINATION LIGHT ASSEMBLY RH 

    Refer to INSPECTION [09/2022 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY 

    Refer to REMOVAL [09/2022 - 11/2022] , or refer to REMOVAL [11/2022 - 09/2024] , or refer to REMOVAL [09/2024 - ]

    Result: 

    NG 

    REPLACE REAR COMBINATION LIGHT ASSEMBLY RH 

    Refer to REMOVAL [09/2022 - 11/2022] , or refer to REMOVAL [11/2022 - ]

scientia non olet · About LEMON Manuals