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


  1. for TMC, TMMR Made:

    B000J6VE02

  2. for TMMK Made:

    B000J6VE17

INSPECTION PROCEDURE

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Start the engine.

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / HL AutoLeveling / Active Test.

    5. Check that the leveling motors operate.

      HL AutoLeveling
      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 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. for TMC, TMMR Made:


      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) - A18-2 (LHM+) Always Below 1 Ω
        A34-11 (LH+) - A18-3 (LHB1) Always Below 1 Ω
        A34-24 (LH-) - A18-1 (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) - A62-2 (RHM+) Always Below 1 Ω
        A34-10 (RH+) - A62-3 (RHB1) Always Below 1 Ω
        A34-23 (RH-) - A62-1 (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

    2. for TMMK Made:


      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) - A90-2 (LHM+) Always Below 1 Ω
        A34-11 (LH+) - A90-3 (LHB1) Always Below 1 Ω
        A34-24 (LH-) - A90-1 (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) - A94-2 (RHM+) Always Below 1 Ω
        A34-10 (RH+) - A94-3 (RHB1) Always Below 1 Ω
        A34-23 (RH-) - A94-1 (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 LEVELING MOTOR


    1. Replace the headlight leveling motor with a new or a known good one (for TMC, TMMR Made: Click here, (for TMMK Made: 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)