LIGHTING SYSTEM High Beam Headlight Circuit

DESCRIPTION

The illumination of the high beam headlights is controlled by the headlight ECU sub-assembly.

WIRING DIAGRAM

B006OQZE02

CAUTION / NOTICE / HINT

Note

After the headlight ECU sub-assembly LH is replaced, vehicle information registration and initialization are necessary.

Click here

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS


    1. Using the GTS, perform the Active Test.

      Click here


      Body Electrical > Main Body > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Head Light Hi Illuminates the high beam headlights ON or OFF -

      Body Electrical > Main Body > Active Test
      Tester Display
      Head Light Hi
      Result
      Result Proceed to
      The Active Test is performed normally A
      The Active Test is not performed normally for the left side light only B
      The Active Test is not performed normally for the right side light only C

    A

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

    C

    CHECK HEADLIGHT UNIT ASSEMBLY RH Click here

    B

  2. CHECK HEADLIGHT UNIT ASSEMBLY LH


    1. Interchange the headlight unit assembly LH with RH and connect the connectors to them.

      for ALPHARD:

      Click here

      for VELLFIRE:

      Click here

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

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

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH Click here

    OK

  3. CHECK HEADLIGHT UNIT ASSEMBLY LH


    1. B006PJJC01
      *a

      Component without harness connected

      (to Headlight ECU Sub-assembly LH)
      *b

      Component without harness connected

      (to Headlight LED Unit Assembly LH)

      Remove the headlight unit assembly LH.

      for ALPHARD:

      Click here

      for VELLFIRE:

      Click here

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

      Standard Resistance
      w/ Cornering Light
      Tester Connection Condition Specified Condition
      B-19 - D-4 Always Below 1 Ω
      B-11 - D-3 Always Below 1 Ω
      w/o Cornering Light
      Tester Connection Condition Specified Condition
      B-20 - D-4 Always Below 1 Ω
      B-11 - D-3 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HEADLIGHT LED UNIT ASSEMBLY LH for ALPHARD: REPLACE HEADLIGHT LED UNIT ASSEMBLY LH Click here
    REPLACE HEADLIGHT LED UNIT ASSEMBLY LH for VELLFIRE: REPLACE HEADLIGHT LED UNIT ASSEMBLY LH Click here

    NG

    REPLACE HEADLIGHT UNIT ASSEMBLY LH for ALPHARD: REPLACE HEADLIGHT UNIT ASSEMBLY LH Click here
    REPLACE HEADLIGHT UNIT ASSEMBLY LH for VELLFIRE: REPLACE HEADLIGHT UNIT ASSEMBLY LH Click here

  4. CHECK HEADLIGHT UNIT ASSEMBLY RH


    1. Interchange the headlight unit assembly RH with LH and connect the connectors to them.

      for ALPHARD:

      Click here

      for VELLFIRE:

      Click here

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

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

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH Click here

    OK

  5. CHECK HEADLIGHT UNIT ASSEMBLY RH


    1. B006PJJC01
      *a

      Component without harness connected

      (to Headlight ECU Sub-assembly RH)
      *b

      Component without harness connected

      (to Headlight LED Unit Assembly RH)

      Remove the headlight unit assembly RH.

      for ALPHARD:

      Click here

      for VELLFIRE:

      Click here

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

      Standard Resistance
      w/ Cornering Light
      Tester Connection Condition Specified Condition
      B-19 - D-4 Always Below 1 Ω
      B-11 - D-3 Always Below 1 Ω
      w/o Cornering Light
      Tester Connection Condition Specified Condition
      B-20 - D-4 Always Below 1 Ω
      B-11 - D-3 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HEADLIGHT LED UNIT ASSEMBLY RH for ALPHARD: REPLACE HEADLIGHT LED UNIT ASSEMBLY RH Click here
    REPLACE HEADLIGHT LED UNIT ASSEMBLY RH for VELLFIRE: REPLACE HEADLIGHT LED UNIT ASSEMBLY RH Click here

    NG

    REPLACE HEADLIGHT UNIT ASSEMBLY RH for ALPHARD: REPLACE HEADLIGHT UNIT ASSEMBLY RH Click here
    REPLACE HEADLIGHT UNIT ASSEMBLY RH for VELLFIRE: REPLACE HEADLIGHT UNIT ASSEMBLY RH Click here