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

DESCRIPTION

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

WIRING DIAGRAM

A0040D5E16

INSPECTION PROCEDURE

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 headlight 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: Move up

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

      ON: Move down

      OFF: Stop
      OK
      Headlight leveling motors operate normally.

    NG

    CHECK HARNESS AND CONNECTOR (HEADLIGHT LEVELING MOTOR - 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 LEVELING MOTOR - HEADLIGHT LEVELING ECU ASSEMBLY)


    1. Disconnect the A63 headlight leveling ECU assembly connector.

    2. Disconnect the A14 or A48 headlight unit (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
      A63-18 (LHT) - A14-2 (LH T) Always Below 1 Ω
      A63-11 (LH+) - A14-3 (LHIG) Always Below 1 Ω
      A63-24 (LH-) - A14-1 (LH E) Always Below 1 Ω
      A63-18 (LHT) - Body ground Always 10 kΩ or higher
      A63-11 (LH+) - Body ground Always 10 kΩ or higher
      A63-24 (LH-) - Body ground Always 10 kΩ or higher
      RH Side
      Tester Connection Condition Specified Condition
      A63-17 (RHT) - A48-2 (RH T) Always Below 1 Ω
      A63-10 (RH+) - A48-3 (RHIG) Always Below 1 Ω
      A63-23 (RH-) - A48-1 (RH E) Always Below 1 Ω
      A63-17 (RHT) - Body ground Always 10 kΩ or higher
      A63-10 (RH+) - Body ground Always 10 kΩ or higher
      A63-23 (RH-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HEADLIGHT UNIT (HEADLIGHT LEVELING MOTOR)


    1. Replace the headlight unit (headlight leveling motor) 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 UNIT (HEADLIGHT LEVELING MOTOR) WAS DEFECTIVE)