AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM Headlight Beam Level Control Actuator Circuit

DESCRIPTION

The headlight leveling ECU actuates the headlight leveling motors according to the vehicle conditions.

WIRING DIAGRAM

A01QR89E09

CAUTION / NOTICE / HINT

Tech Tips

After replacing the headlight leveling ECU, initialization of the ECU is necessary.

Click here

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS (HEADLIGHT LEVELING MOTOR)


    1. Using the GTS, perform the Active Test.

      Click here


      Body Electrical > HL AutoLeveling > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Drive The Leveling Motor Leveling motor Up, Down or Stop -

      Body Electrical > HL AutoLeveling > Active Test
      Tester Display
      Drive The Leveling Motor
      Result
      Proceed to
      Headlight leveling motors operate normally
      Headlight leveling motors does not operate normally

    Headlight leveling motors operate normally

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

    Headlight leveling motors does not operate normally

  2. CHECK HARNESS AND CONNECTOR (HEADLIGHT UNIT - HEADLIGHT LEVELING ECU ASSEMBLY)


    1. Disconnect the A67 headlight leveling ECU connector.

    2. Disconnect the A57*1 or A56*2 headlight leveling motor connector.


      • *1: for LH

      • *2: for RH

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

      Standard Resistance
      for LH
      Tester Connection Condition Specified Condition
      A67-11 (LH+) - A57-3 (LHM+) Always Below 1 Ω
      A67-18 (LHT) - A57-2 (LH T) Always Below 1 Ω
      A67-24 (LH-) - A57-1 (LH E) Always Below 1 Ω
      A67-11 (LH+) - Body ground Always 10 kΩ or higher
      A67-18 (LHT) - Body ground Always 10 kΩ or higher
      A67-24 (LH-) - Body ground Always 10 kΩ or higher
      for RH
      Tester Connection Condition Specified Condition
      A67-10 (RH+) - A56-3 (RHM+) Always Below 1 Ω
      A67-17 (RHT) - A56-2 (RH T) Always Below 1 Ω
      A67-23 (RH-) - A56-1 (RH E) Always Below 1 Ω
      A67-10 (RH+) - Body ground Always 10 kΩ or higher
      A67-17 (RHT) - Body ground Always 10 kΩ or higher
      A67-23 (RH-) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HEADLIGHT LEVELING ECU ASSEMBLY


    1. Temporarily replace the headlight leveling ECU with a new or normally functioning one.

      Click here

    2. Perform the Active Test of the leveling motors.

      Click here


      Body Electrical > HL AutoLeveling > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Drive The Leveling Motor Leveling motor Up, Down or Stop -

      Body Electrical > HL AutoLeveling > Active Test
      Tester Display
      Drive The Leveling Motor
      Result
      Proceed to
      Headlight leveling motors operate normally
      Headlight leveling motors does not operate normally

    Headlight leveling motors operate normally

    END (HEADLIGHT LEVELING ECU WAS DEFECTIVE)

    Headlight leveling motors does not operate normally

    REPLACE HEADLIGHT UNIT Click here