LIGHTING SYSTEM Headlight Beam Level Control Actuator Circuit

DESCRIPTION

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

WIRING DIAGRAM

A005796E03

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. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

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

    5. Using the GTS, perform the Active Test.

      HL Auto Leveling
      Tester Display Test Part Control Range Diagnostic Note
      Drive The Leveling Motor UP Leveling motor upward operation ON/OFF Perform the Active Test with ignition switch ON and the vehicle stopped.
      Drive The Leveling Motor DOWN Leveling motor downward operation ON/OFF Perform the Active Test with ignition switch ON and the vehicle stopped.
      OK
      Headlight leveling motors operate normally.

    OK

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

    NG

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


    1. Disconnect the A66 headlight leveling ECU assembly connector.

    2. Disconnect the A59*1 or A58*2 headlight assembly 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
      A66-11 (LH+) - A59-1 (LHIG) Always Below 1 Ω
      A66-18 (LHT) - A59-2 (LH T)
      A66-24 (LH-) - A59-3 (LH E)
      A66-11 (LH+) - Body ground Always 10 kΩ or higher
      A66-18 (LHT) - Body ground
      A66-24 (LH-) - Body ground
      for RH
      Tester Connection Condition Specified Condition
      A66-10 (RH+) - A58-1 (RHIG) Always Below 1 Ω
      A66-17 (RHT) - A58-2 (RH T) Always Below 1 Ω
      A66-23 (RH-) - A58-3 (RH E) Always Below 1 Ω
      A66-10 (RH+) - Body ground Always 10 kΩ or higher
      A66-17 (RHT) - Body ground Always 10 kΩ or higher
      A66-23 (RH-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HEADLIGHT UNIT (OPERATION)


    1. Temporarily replace the headlight assembly (headlight leveling motor) with a new or normally functioning one Click here.

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the GTS on.

    5. Enter the following menus: Body Electrical / HL Auto Leveling / Active Test.

    6. Using the GTS, perform the Active Test.

      HL Auto Leveling
      Tester Display Test Part Control Range Diagnostic Note
      Drive The Leveling Motor UP Leveling motor upward operation ON/OFF Perform the Active Test with ignition switch ON and the vehicle stopped.
      Drive The Leveling Motor DOWN Leveling motor downward operation ON/OFF Perform the Active Test with ignition switch ON and the vehicle stopped.
      OK
      Headlight leveling motors operate normally.
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    A

    END (HEADLIGHT ASSEMBLY IS DEFECTIVE)

    B

    REPLACE HEADLIGHT LEVELING ECU ASSEMBLY Click here

    C

    REPLACE HEADLIGHT LEVELING ECU ASSEMBLY Click here