LIGHTING SYSTEM Headlight Beam Level Control Actuator Circuit

DESCRIPTION

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

WIRING DIAGRAM

A003W3DE01

INSPECTION PROCEDURE

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (READY).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / 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: 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 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 A46 headlight leveling ECU assembly connector.

    2. Disconnect the A8 or A39 headlight assembly connector.

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

      Standard Resistance
      LH Side
      Tester Connection Condition Specified Condition
      A8-8 (LHIG) - 3 Always Below 1 Ω
      A8-3 (LHT) - 2 Always Below 1 Ω
      A8-4 (LHE) - 1 Always Below 1 Ω
      A8-8 (LHIG) - Body ground Always 10 kΩ or higher
      A8-3 (LHT) - Body ground Always 10 kΩ or higher
      A8-4 (LHE) - Body ground Always 10 kΩ or higher
      RH Side
      Tester Connection Condition Specified Condition
      A39-8 (RHIG) - 3 Always Below 1 Ω
      A39-3 (RHT) - 2 Always Below 1 Ω
      A39-4 (RHE) - 1 Always Below 1 Ω
      A39-8 (RHIG) - Body ground Always 10 kΩ or higher
      A39-3 (RHT) - Body ground Always 10 kΩ or higher
      A39-4 (RHE) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HEADLIGHT ASSEMBLY (HEADLIGHT ASSEMBLY - HEADLIGHT LEVELING MOTOR)


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

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

      Standard Resistance
      LH Side
      Tester Connection Condition Specified Condition
      A46-18 (LHT) - A8-3 (LHT) Always Below 1 Ω
      A46-11 (LH+) - A8-8 (LHIG) Always Below 1 Ω
      A46-24 (LH-) - A8-4 (LHE) Always Below 1 Ω
      A46-18 (LHT) - Body ground Always 10 kΩ or higher
      A46-11 (LH+) - Body ground Always 10 kΩ or higher
      A46-24 (LH-) - Body ground Always 10 kΩ or higher
      RH Side
      Tester Connection Condition Specified Condition
      A46-17 (RHT) - A39-3 (RHT) Always Below 1 Ω
      A46-10 (RH+) - A39-8 (RHIG) Always Below 1 Ω
      A46-23 (RH-) - A39-4 (RHE) Always Below 1 Ω
      A46-17 (RHT) - Body ground Always 10 kΩ or higher
      A46-10 (RH+) - Body ground Always 10 kΩ or higher
      A46-23 (RH-) - Body ground Always 10 kΩ or higher

    NG

    REPLACE HEADLIGHT ASSEMBLY Click here

    OK

  4. REPLACE HEADLIGHT LEVELING MOTOR


    1. Replace the 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.
      Result
      Result Proceed to
      NG A
      OK (for LHD) B
      OK (for RHD) C

    B

    REPLACE HEADLIGHT LEVELING ECU ASSEMBLY Click here

    C

    REPLACE HEADLIGHT LEVELING ECU ASSEMBLY Click here

    A

    END (HEADLIGHT LEVELING MOTOR WAS DEFECTIVE)