LIGHTING SYSTEM Turn Signal Light Circuit

DESCRIPTION

The main body ECU LH controls the operation of the turn signal flasher assembly. The turn signal flasher assembly blinks the turn signal lights.

The main body ECU LH receives RH/LH turn signal light blink request signals from the combination switch ECU through BEAN communication and sends operation signals to the turn signal flasher assembly.

WIRING DIAGRAM

A015YS6E02

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK TURN SIGNAL LIGHT (OPERATION)


    1. Turn the engine switch on (IG).

    2. When the turn signal light switch is operated, check that the corresponding turn signal lights flash.

      Tech Tips

      The front and rear turn signal lights share the same drive circuit. Therefore, if either the front or rear turn signal lights do not come on, there may be a problem in the circuit between the turn signal flasher and the bulb, or the circuit between the bulb and body ground.

      Result
      Result Proceed to
      Neither left nor right turn signal lights flash A
      Left turn signal lights do not flash B
      Right turn signal lights do not flash C

    B

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER Click here

    C

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER Click here

    A

  2. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Body No. 3 / Active Test.

    5. Check the operation.

      Body No. 3 (Main Body ECU LH)
      Tester Display Test Part Control Range Diagnostic Note
      Turn Light RH RH side turn signal lights ON/OFF -
      Turn Light LH LH side turn signal lights ON/OFF -
      OK
      Turn signal lights flash.

    NG

    INSPECT FUSE (LH-IG, TURN-HAZ) Click here

    OK

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

  3. INSPECT FUSE (LH-IG, TURN-HAZ)


    1. Remove the LH-IG fuse from the cowl side junction block LH.

    2. Remove the TURN-HAZ fuse from the No. 1 engine room junction block.

    3. Measure the resistance of the fuses.

      Standard Resistance
      Below 1 Ω

    NG

    REPLACE FUSE

    OK

  4. CHECK HARNESS AND CONNECTOR (POWER SOURCE)


    1. A015ZGLE09

      Disconnect the J30 turn signal flasher assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      J30-7 (E) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      J30-4 (B) - Body ground Always 11 to 14 V
      J30-1 (IG) - Body ground Engine switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REPLACE TURN SIGNAL FLASHER ASSEMBLY


    1. Temporarily replace the turn signal flasher assembly with a new or normally functioning one Click here for LHD, Click here for RHD).

    2. Check that the turn signal lights flash.

      OK
      Turn signal lights flash.

    NG

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    OK

    END

  6. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Body No. 3 / Active Test.

    5. Check the operation.

      Body No. 3 (Main Body ECU LH)
      Tester Display Test Part Control Range Diagnostic Note
      Turn Light LH LH side turn signal lights ON/OFF -
      OK
      Turn signal lights flash.

    NG

    CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - BODY GROUND) Click here

    OK

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

  7. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - BODY GROUND)


    1. A015ZA4E03

      Disconnect the LA main body ECU LH connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      LA-16 (TL) - Body ground Always 11 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - TURN SIGNAL FLASHER ASSEMBLY) Click here

    OK

  8. CHECK HARNESS AND CONNECTOR (TURN SIGNAL FLASHER ASSEMBLY - HEADLIGHT)


    1. A0161CSE14

      Disconnect the J30 turn signal flasher assembly connector.

    2. Disconnect the B12 headlight assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      J30-3 (LL) - B12-9 Always Below 1 Ω
      J30-3 (LL) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. REPLACE TURN SIGNAL FLASHER ASSEMBLY


    1. Temporarily replace the turn signal flasher assembly with a new or normally functioning one Click here for LHD, Click here for RHD).

    2. Check that the turn signal lights flash.

      OK
      Turn signal lights flash.

    NG

    REPLACE MAIN BODY ECU LH (COWL SIDE JUNCTION BLOCK LH)

    OK

    END

  10. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - TURN SIGNAL FLASHER ASSEMBLY)


    1. A0161Y9E10

      Disconnect the LA main body ECU LH connector.

    2. Disconnect the J30 turn signal flasher assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      LA-16 (TL) - J30-5 (EL) Always Below 1 Ω
      LA-16 (TL) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      NG A
      OK (for LHD) B
      OK (for RHD) C

    B

    REPLACE TURN SIGNAL FLASHER ASSEMBLY Click here

    C

    REPLACE TURN SIGNAL FLASHER ASSEMBLY Click here

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  11. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Body No. 3 / Active Test.

    5. Check the operation.

      Body No. 3 (Main Body ECU LH)
      Tester Display Test Part Control Range Diagnostic Note
      Turn Light RH RH side turn signal lights ON/OFF -
      OK
      Turn signal lights flash.

    NG

    CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - BODY GROUND) Click here

    OK

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

  12. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - BODY GROUND)


    1. A015ZA4E04

      Disconnect the LA main body ECU LH connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      LA-15 (TR) - Body ground Always 11 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - TURN SIGNAL FLASHER ASSEMBLY) Click here

    OK

  13. CHECK HARNESS AND CONNECTOR (TURN SIGNAL FLASHER ASSEMBLY - HEADLIGHT)


    1. A0161CSE15

      Disconnect the J30 turn signal flasher assembly connector.

    2. Disconnect the B2 headlight assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      J30-2 (LR) - B2-9 Always Below 1 Ω
      J30-2 (LR) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  14. REPLACE TURN SIGNAL FLASHER ASSEMBLY


    1. Temporarily replace the turn signal flasher assembly with a new or normally functioning one Click here for LHD, Click here for RHD).

    2. Check that the turn signal lights flash.

      OK
      Turn signal lights flash.

    NG

    REPLACE MAIN BODY ECU LH (COWL SIDE JUNCTION BLOCK LH)

    OK

    END

  15. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - TURN SIGNAL FLASHER ASSEMBLY)


    1. A0161Y9E11

      Disconnect the LA main body ECU LH connector.

    2. Disconnect the J30 turn signal flasher assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      LA-15 (TR) - J30-6 (ER) Always Below 1 Ω
      LA-15 (TR) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      NG A
      OK (for LHD) B
      OK (for RHD) C

    B

    REPLACE TURN SIGNAL FLASHER ASSEMBLY Click here

    C

    REPLACE TURN SIGNAL FLASHER ASSEMBLY Click here

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR