LIGHTING SYSTEM High Beam Headlight Circuit

DESCRIPTION

The headlight ECU sub-assemblies control the high beam headlights.

WIRING DIAGRAM

B005NYOE05

CAUTION / NOTICE / HINT

Note

If the headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information and initialize the headlight ECU sub-assembly LH.

Click here

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the engine 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 ON or OFF -

      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 assembly LH.

      Click here

    2. Remove the headlight unit assembly LH from the headlight assembly LH.

      Click here

    3. B005M1TC12
      *a

      Component without harness connected

      (to Headlight Unit Assembly LH)
      *b

      Component without harness connected

      (to Headlight ECU Sub-assembly LH)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B-10 - D-10 Always Below 1 Ω
      B-1 - D-4 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADlIGHT UNIT LH Click here

    OK

  3. REPLACE HEADLIGHT UNIT ASSEMBLY LH


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

      Click here

    2. Check that the high beam light LH operate normally.

      OK
      High beam light LH operate normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (HEADLIGHT UNIT ASSEMBLY LH WAS DEFECTIVE)

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH Click here

  4. INSPECT HEADLIGHT UNIT RH


    1. Remove the headlight assembly RH.

      Click here

    2. Remove the headlight unit assembly RH from the headlight assembly RH.

      Click here

    3. B005M1TC07
      *a

      Component without harness connected

      (to Headlight Unit Assembly RH)
      *b

      Component without harness connected

      (to Headlight ECU Sub-assembly RH)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B-10 - D-10 Always Below 1 Ω
      B-1 - D-4 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT UNIT RH Click here

    OK

  5. REPLACE HEADLIGHT UNIT ASSEMBLY RH


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

      Click here

    2. Check that the high beam light RH operate normally.

      OK
      High beam light RH operate normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (HEADLIGHT UNIT ASSEMBLY RH WAS DEFECTIVE)

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH Click here