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

DESCRIPTION

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

WIRING DIAGRAM

A00078WE01

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (READY).

    3. Turn the GTS on.

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

    5. Check that the leveling motors operate.

      HL Auto Leveling
      Tester Display Test Part Control Range Diagnostic Note
      Drive The Leveling Motor UP Leveling motor upward operation ON/OFF

      ON: Moves up

      OFF: Stops
      Drive The Leveling Motor DOWN Leveling motor downward operation ON/OFF

      ON: Moves down

      OFF: Stops
      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 ASSEMBLY - HEADLIGHT LEVELING ECU ASSEMBLY)


    1. Disconnect the A29 headlight leveling ECU assembly connector.

    2. Disconnect the A18 headlight assembly LH connector or A51 headlight assembly RH connector.

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

      Standard Resistance
      for LH Side:
      Tester Connection Condition Specified Condition
      A29-18 (LHT) - A18-2 (LHT) Always Below 1 Ω
      A29-11 (LH+) - A18-3 (LHIG) Always Below 1 Ω
      A29-24 (LH-) - A18-6 (LHE) Always Below 1 Ω
      A29-18 (LHT) - Body ground Always 10 kΩ or higher
      A29-11 (LH+) - Body ground Always 10 kΩ or higher
      A29-24 (LH-) - Body ground Always 10 kΩ or higher
      for RH Side:
      Tester Connection Condition Specified Condition
      A29-17 (RHT) - A51-2 (RHT) Always Below 1 Ω
      A29-10 (RH+) - A51-3 (RHIG) Always Below 1 Ω
      A29-23 (RH-) - A51-6 (RHE) Always Below 1 Ω
      A29-17 (RHT) - Body ground Always 10 kΩ or higher
      A29-10 (RH+) - Body ground Always 10 kΩ or higher
      A29-23 (RH-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HEADLIGHT CORD


    1. Remove the headlight cord Click here.

    2. for LH Side:


      1. A0006KJE02
        Text in Illustration
        *a

        Component without harness connected

        (Headlight Cord (for LH Side))

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        A18-3 (LHIG) - LVL-3 Always Below 1 Ω
        A18-2 (LHT) - LVL-2 Always Below 1 Ω
        A18-6 (LHE) - LVL-1 Always Below 1 Ω
        A18-3 (LHIG) - Body ground Always 10 kΩ or higher
        A18-2 (LHT) - Body ground Always 10 kΩ or higher
        A18-6 (LHE) - Body ground Always 10 kΩ or higher

    3. for RH Side:


      1. A0008J8E02
        Text in Illustration
        *a

        Component without harness connected

        (Headlight Cord (for RH Side))

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        A51-3 (RHIG) - LVR-3 Always Below 1 Ω
        A51-2 (RHT) - LVR-2 Always Below 1 Ω
        A51-6 (RHE) - LVR-1 Always Below 1 Ω
        A51-3 (RHIG) - Body ground Always 10 kΩ or higher
        A51-2 (RHT) - Body ground Always 10 kΩ or higher
        A51-6 (RHE) - Body ground Always 10 kΩ or higher

    NG

    REPLACE HEADLIGHT CORD Click here

    OK

  4. CHECK HEADLIGHT LEVELING MOTOR


    1. Replace the headlight leveling motor with a new or known good one Click here.

    2. Perform the active test of the leveling motors.

      OK
      Headlight leveling motors operate normally.

    OK

    END (HEADLIGHT LEVELING MOTOR WAS DEFECTIVE)

    NG

    REPLACE HEADLIGHT LEVELING ECU ASSEMBLY Click here