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

A0028HLE04

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Start the engine.

    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
      Drive The Leveling Motor Leveling motor upward or downward operation Stop/Down/Up Perform the Active Test with the engine started and vehicle stopped

      Body Electrical > HL AutoLeveling > Active Test
      Tester Display
      Drive The Leveling Motor
      OK
      Headlight leveling motors operate normally.
      Result
      Proceed to
      OK
      NG

    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 A67 headlight leveling ECU assembly connector.

    2. Disconnect the A82*1 or A84*2 headlight assembly connector.


      • *1: for LH Side

      • *2: for RH Side

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

      Standard Resistance
      for LH Side
      Tester Connection Condition Specified Condition
      A82-5 (LHIG) - A67-11 (LH+) Always Below 1 Ω
      A82-3 (LH T) - A67-18 (LHT) Always Below 1 Ω
      A82-2 (LH E) - A67-24 (LH-) Always Below 1 Ω
      A82-5 (LHIG) or A67-11 (LH+) - Body ground Always 10 kΩ or higher
      A82-3 (LH T) or A67-18 (LHT) - Body ground Always 10 kΩ or higher
      A82-2 (LH E) or A67-24 (LH-) - Body ground Always 10 kΩ or higher
      for RH Side
      Tester Connection Condition Specified Condition
      A84-5 (RHIG) - A67-10 (RH+) Always Below 1 Ω
      A84-3 (RH T) - A67-17 (RHT) Always Below 1 Ω
      A84-2 (RH E) - A67-23 (RH-) Always Below 1 Ω
      A84-5 (RHIG) or A67-10 (RH+) - Body ground Always 10 kΩ or higher
      A84-3 (RH T) or A67-17 (RHT) - Body ground Always 10 kΩ or higher
      A84-2 (RH E) or 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 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.


      Body Electrical > HL AutoLeveling > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Drive The Leveling Motor Leveling motor upward or downward operation Stop/Down/Up Perform the Active Test with the engine started and vehicle stopped

      Body Electrical > HL AutoLeveling > Active Test
      Tester Display
      Drive The Leveling Motor
      OK
      Headlight leveling motors operate normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (HEADLIGHT LEVELING MOTOR WAS DEFECTIVE)

    NG

    REPLACE HEADLIGHT LEVELING ECU ASSEMBLY Click here