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

A01HSKAE04

INSPECTION PROCEDURE

PROCEDURE


  1. PERFORM ACTIVE TEST USING TECHSTREAM


    1. Connect the Techstream to the DLC3.

    2. Start the engine.

    3. Turn the Techstream 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.

    NG

    CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - HEADLIGHT LEVELING ECU ASSEMBLY) Click here

    OK

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

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


    1. Disconnect the A34 headlight leveling ECU assembly connector.

    2. Disconnect the LH side or RH side headlight leveling motor connector.

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

      Standard Resistance
      LH Side
      Tester Connection Condition Specified Condition
      A34-18 (LHE) - A79-2 (LHM+) Always Below 1 Ω
      A34-11 (LH+) - A79-3 (LHB1) Always Below 1 Ω
      A34-24 (LH-) - A79-1 (LHE) Always Below 1 Ω
      A34-18 (LHE) - Body ground Always 10 kΩ or higher
      A34-11 (LH+) - Body ground Always 10 kΩ or higher
      A34-24 (LH-) - Body ground Always 10 kΩ or higher
      RH Side
      Tester Connection Condition Specified Condition
      A34-17 (RHE) - A76-2 (RHM+) Always Below 1 Ω
      A34-10 (RH+) - A76-3 (RHB1) Always Below 1 Ω
      A34-23 (RH-) - A76-1 (RHE) Always Below 1 Ω
      A34-17 (RHE) - Body ground Always 10 kΩ or higher
      A34-10 (RH+) - Body ground Always 10 kΩ or higher
      A34-23 (RH-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HEADLIGHT ASSEMBLY


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

    2. Perform the active test of the leveling motors.

      OK
      Headlight leveling motors operate normally.

    NG

    REPLACE HEADLIGHT LEVELING ECU ASSEMBLY Click here

    OK

    END (HEADLIGHT LEVELING MOTOR WAS DEFECTIVE)