LIGHTING SYSTEM High Beam Headlight Circuit

DESCRIPTION

The No. 1 headlight ECU sub-assembly controls the high beam headlights.

WIRING DIAGRAM

A003M3XE10

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
      OK
      High beam headlights illuminate.
      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 ASSEMBLY RH Click here

    B

  2. INSPECT HEADLIGHT UNIT ASSEMBLY LH

    A003M5IC05
    *a

    Component without harness connected

    (to No. 1 Headlight ECU Sub-assembly LH)

    		 *b

    Component without harness connected

    (to Headlight Unit LH)

    1. Remove the headlight assembly LH.

      Click here

    2. Remove the headlight unit LH.

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C-8 (HILED2) - D-1 Always Below 1 Ω
      C-9 (HILED1) - D-2 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT UNIT ASSEMBLY LH Click here

    OK

  3. REPLACE HEADLIGHT UNIT LH


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

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  4. CHECK OPERATION (HIGH BEAM HEADLIGHT)


    1. Check that the high beam LH operates normally.

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

    OK

    END (HEADLIGHT UNIT LH WAS DEFECTIVE)

    NG

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

  5. INSPECT HEADLIGHT UNIT ASSEMBLY RH

    A003M5IC05
    *a

    Component without harness connected

    (to No. 1 Headlight ECU Sub-assembly RH)

    		 *b

    Component without harness connected

    (to Headlight Unit RH)

    1. Remove the headlight assembly RH.

      Click here

    2. Remove the headlight unit RH.

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C-8 (HILED2) - D-1 Always Below 1 Ω
      C-9 (HILED1) - D-2 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT UNIT ASSEMBLY RH Click here

    OK

  6. REPLACE HEADLIGHT UNIT RH


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

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  7. CHECK OPERATION (HIGH BEAM HEADLIGHT)


    1. Check that the high beam RH operates normally.

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

    OK

    END (HEADLIGHT UNIT RH WAS DEFECTIVE)

    NG

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