LIGHTING SYSTEM Headlight Beam Level Control Actuator Circuit

DTC Code DTC Name
Headlight Beam Level Control Actuator Circuit

DESCRIPTION

The headlight leveling ECU actuates the headlight leveling motors according to the vehicle conditions.

WIRING DIAGRAM

E269501E01

CAUTION / NOTICE / HINT

Tip:

After replacing the headlight leveling ECU, initialization of the ECU is necessary (Click here).

PROCEDURE

  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (HEADLIGHT LEVELING MOTOR)

    1. Using the intelligent tester, perform the Active Test (Click here).

      Table 1. HL Auto Leveling

      Tester Display

      Test Part

      Control Range

      Diagnostic Note

      Drive The Leveling Motor UP

      Leveling motor

      ON / OFF

      -

      Drive The Leveling Motor DOWN

      Leveling motor

      ON / OFF

      -

      OK

      Headlight leveling motors operate normally.

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    (Click here)

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

    U124037E02
    Table 2. Text in Illustration

    *1

    for LH

    *2

    for RH

    *3

    Front view of wire harness connector

    (to Headlight Assembly)

    *4

    Front view of wire harness connector

    (to Headlight Leveling ECU Assembly)

    1. Disconnect the A49 headlight leveling ECU connector.

    2. Disconnect the A58*1 or A62*2 headlight connector.

      • *1: for LH

      • *2: for RH

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

      Standard Resistance

      for LH

      Tester Connection

      Condition

      Specified Condition

      A49-11 (LHT) - A58-1 (LH T)

      Always

      Below 1 Ω

      A49-18 (LH+) - A58-2 (LHM+)

      Always

      Below 1 Ω

      A49-24 (LH-) - A58-3 (LH E)

      Always

      Below 1 Ω

      A49-11 (LHT) - Body ground

      Always

      10 kΩ or higher

      A49-18 (LH+) - Body ground

      Always

      10 kΩ or higher

      A49-24 (LH-) - Body ground

      Always

      10 kΩ or higher

      for RH

      Tester Connection

      Condition

      Specified Condition

      A49-10 (RHT) - A62-1 (RH T)

      Always

      Below 1 Ω

      A49-17 (RH+) - A62-2 (RHM+)

      Always

      Below 1 Ω

      A49-23 (RH-) - A62-3 (RH E)

      Always

      Below 1 Ω

      A49-10 (RHT) - Body ground

      Always

      10 kΩ or higher

      A49-17 (RH+) - Body ground

      Always

      10 kΩ or higher

      A49-23 (RH-) - Body ground

      Always

      10 kΩ or higher

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. CHECK HEADLIGHT LEVELING ECU ASSEMBLY

    1. Temporarily replace the headlight leveling ECU assembly with a new or normally functioning one (Click herefor LHD,Click herefor RHD).

    2. Perform the Active Test of the leveling motors (Click here).

      OK

      Headlight leveling motors operate normally.

      Table 3. Result

      Result

      Proceed to

      OK

      A

      NG (for Halogen Headlight)

      B

      NG (for HID Headlight)

      C

    END (HEADLIGHT LEVELING ECU ASSEMBLY IS DEFECTIVE)

    REPLACE HEADLIGHT ASSEMBLY

    (Click here)

    REPLACE HEADLIGHT ASSEMBLY

    (Click here)