LIGHTING SYSTEM High Beam Headlight Circuit

DESCRIPTION

The No. 1 headlight ECU sub-assemblies control the high beam headlights.

WIRING DIAGRAM


  1. for Bulb Type Turn Signal Light

    B003Y7XE09

  2. for LED Type Turn Signal Light

    B003XV0E02

CAUTION / NOTICE / HINT

Note

If the No. 1 headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information and initialize the No. 1 headlight ECU sub-assembly LH.

Click here

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / HL AutoLeveling / Active Test.

    5. Perform the Active Test according to the display on the GTS.


      Body Electrical > HL AutoLeveling > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Headlight High Beam High beam headlights OFF or ON -

      Body Electrical > HL AutoLeveling > Active Test
      Tester Display
      Headlight High Beam
      Result
      Result Proceed to
      OK A
      NG (for LH Side) B
      NG (for RH Side) C

    A

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

    C

    INSPECT HEADLIGHT UNIT RH Click here

    B

  2. INSPECT HEADLIGHT UNIT LH


    1. Remove the headlight unit LH.

      for Bulb Type Turn Signal Light: Click here

      for LED Type Turn Signal Light: Click here

    2. Remove the headlight unit assembly LH.

      for Bulb Type Turn Signal Light: Click here

      for LED Type Turn Signal Light: Click here

    3. Inspect the headlight unit LH.

      for Bulb Type Turn Signal Light: Click here

      for LED Type Turn Signal Light: Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT UNIT LH for Bulb Type Turn Signal Light: Click here
    REPLACE HEADLIGHT UNIT LH for LED Type Turn Signal Light: Click here

    OK

  3. REPLACE HEADLIGHT UNIT ASSEMBLY LH


    1. Replace the headlight unit assembly LH with a new or known good one.

      for Bulb Type Turn Signal Light: Click here

      for LED Type Turn Signal Light: Click here

    2. Check that the high beam LH operates normally.

      OK
      High beam LH operates normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (HEADLIGHT UNIT ASSEMBLY LH WAS DEFECTIVE)

    NG

    REPLACE NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH Click here

  4. INSPECT HEADLIGHT UNIT RH


    1. Remove the headlight unit RH.

      for Bulb Type Turn Signal Light: Click here

      for LED Type Turn Signal Light: Click here

    2. Remove the headlight unit assembly RH.

      for Bulb Type Turn Signal Light: Click here

      for LED Type Turn Signal Light: Click here

    3. Inspect the headlight unit RH.

      for Bulb Type Turn Signal Light: Click here

      for LED Type Turn Signal Light: Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT UNIT RH for Bulb Type Turn Signal Light: Click here
    REPLACE HEADLIGHT UNIT RH for LED Type Turn Signal Light: Click here

    OK

  5. REPLACE HEADLIGHT UNIT ASSEMBLY RH


    1. Replace the headlight unit assembly RH with a new or known good one.

      for Bulb Type Turn Signal Light: Click here

      for LED Type Turn Signal Light: Click here

    2. Check that the high beam RH operates normally.

      OK
      High beam RH operates normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (HEADLIGHT UNIT ASSEMBLY RH WAS DEFECTIVE)

    NG

    REPLACE NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH Click here