LIGHTING SYSTEM Taillight Circuit

DESCRIPTION

The main body ECU receives a light control switch information signal from the headlight dimmer switch, and illuminates the taillights, front parking lights and license plate lights.

WIRING DIAGRAM

A003E6LE01

INSPECTION PROCEDURE

Tech Tips

Inspect the fuses and bulbs for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (TAILLIGHT)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Main Body / Active Test / Tail Light.

    5. Check that the taillights, front parking lights and license plate lights turn on/off.

      Main Body
      Tester Display Test Part Control Range Diagnostic Note
      Taillight Relay Taillight ON or OFF -
      OK
      Taillights, front parking lights and license plate lights turn on/off.
      Result
      Result Proceed to
      OK A
      NG (Taillights, front parking lights and license plate lights do not turn on) B
      NG (Front parking lights do not turn on) C
      NG (Taillights and license plate lights do not turn on) D

    B

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

    C

    CHECK FRONT PARKING LIGHT OPERATION Click here

    D

    CHECK TAILLIGHT AND LICENSE PLATE LIGHT OPERATION Click here

    A

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

  2. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BATTERY)

    A003BWME01
    Text in Illustration
    *1

    Front view of wire harness connector

    (to Main Body ECU)

    1. Disconnect the DG main body ECU connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      DG-1 - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MAIN BODY ECU

  3. CHECK FRONT PARKING LIGHT OPERATION


    1. Check the front parking light operation.

      Result
      Result Proceed to
      All front parking lights do not turn on A
      Only one front parking light does not turn on B

    B

    CHECK HARNESS AND CONNECTOR (FRONT PARKING LIGHT - MAIN BODY ECU AND BODY GROUND) Click here

    A

  4. INSPECT MAIN BODY ECU


    1. A003BT4E02
      Text in Illustration
      *1

      Component with harness connected

      (Main Body ECU)

      Remove the main body ECU with its connector still connected.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      DB-15 (TRLY) - Body Ground

      Light control switch

      off → TAIL

      		 Below 1 V → 11 to 14 V
      DB-33 (TRLY) - Body Ground

      Light control switch

      off → TAIL

      		 Below 1 V → 11 to 14 V

    NG

    REPLACE MAIN BODY ECU

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

  5. CHECK HARNESS AND CONNECTOR (FRONT PARKING LIGHT - MAIN BODY ECU AND BODY GROUND)

    A003EBPE02
    Text in Illustration
    *1

    Front view of wire harness connector

    (to Front Parking Light)
    *2 for LH
    *3 for RH

    1. for LH:


      1. Disconnect the A6 front parking light connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        A6-2 (B) - Body ground

        Light control switch

        TAIL

        		 11 to 14 V
        Standard Resistance
        Tester Connection Condition Specified Condition
        A6-1 (E) - Body Ground Always Below 1 Ω

    2. for RH:


      1. Disconnect the A15 front parking light connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        A15-2 (B) - Body ground

        Light control switch

        TAIL

        		 11 to 14 V
        Standard Resistance
        Tester Connection Condition Specified Condition
        A15-1 (E) - Body Ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

  6. CHECK TAILLIGHT AND LICENSE PLATE LIGHT OPERATION


    1. Check the taillight and license plate light operation.

      Result
      Result Proceed to
      Taillight and license plate light do not turn on A
      Taillight (rear combination light) does not turn on B
      License plate light does not turn on C

    B

    CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT [TAILLIGHT] - MAIN BODY ECU AND BODY GROUND) Click here

    C

    CHECK HARNESS AND CONNECTOR (LICENSE PLATE LIGHT - MAIN BODY ECU AND BODY GROUND) Click here

    A

  7. INSPECT MAIN BODY ECU


    1. A003CSKE02
      Text in Illustration
      *1

      Component with harness connected

      (Main Body ECU [Side View])

      Remove the main body ECU with its connector still connected.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      DA-29 (TRLY) - Body Ground

      Light control switch

      off → TAIL

      		 Below 1 V → 11 to 14 V

    NG

    REPLACE MAIN BODY ECU

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

  8. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT [TAILLIGHT] - MAIN BODY ECU AND BODY GROUND)

    A003B7YE02
    Text in Illustration
    *1

    Front view of wire harness connector

    (to Rear Combination Light)
    *2 for LH
    *3 for RH

    1. for LH:


      1. Disconnect the G6 rear combination light connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        G6-1 (B) - Body ground

        Light control switch

        TAIL

        		 11 to 14 V
        Standard Resistance
        Tester Connection Condition Specified Condition
        G6-4 (E) - Body ground Always Below 1 Ω

    2. for RH:


      1. Disconnect the G5 rear combination light connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        G5-1 (B) - Body ground

        Light control switch

        TAIL

        		 11 to 14 V
        Standard Resistance
        Tester Connection Condition Specified Condition
        G5-4 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

  9. CHECK HARNESS AND CONNECTOR (LICENSE PLATE LIGHT - MAIN BODY ECU AND BODY GROUND)

    A003DN5E01

    1. for Sedan (LH Side):


      1. Disconnect the G22 rear license plate light connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        G22-1 - Body ground

        Light control switch

        TAIL

        		 11 to 14 V
        Standard Resistance
        Tester Connection Condition Specified Condition
        G22-2 - Body ground Always Below 1 Ω

    2. for Sedan (RH Side):


      1. Disconnect the G21 rear license plate light connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        G21-1 - Body ground

        Light control switch

        TAIL

        		 11 to 14 V
        Standard Resistance
        Tester Connection Condition Specified Condition
        G21-2 - Body ground Always Below 1 Ω

    3. for Wagon (LH Side):


      1. Disconnect the M2 rear license plate light connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        M2-1 - Body ground

        Light control switch

        TAIL

        		 11 to 14 V
        Standard Resistance
        Tester Connection Condition Specified Condition
        M2-2 - Body ground Always Below 1 Ω

    4. for Wagon (RH Side):


      1. Disconnect the M3 rear license plate light connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        M3-1 - Body ground

        Light control switch

        TAIL

        		 11 to 14 V
        Standard Resistance
        Tester Connection Condition Specified Condition
        M3-2 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here