AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM(for Sedan) Headlight Beam Level Control Actuator Circuit

DESCRIPTION

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

WIRING DIAGRAM

A01TDL6E07

CAUTION / NOTICE / HINT

Note

Make sure to perform vehicle information synchronization and initialization after replacing the headlight leveling ECU assembly.

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PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

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

    5. Perform the Active Test according to the display on the GTS.


      Body Electrical > HL AutoLeveling > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Drive The Leveling Motor Headlight leveling motor upward or downward operation Up/Down/Stop Perform the Active Test with the engine started and vehicle stopped

      Body Electrical > HL AutoLeveling > Active Test
      Tester Display
      Drive The Leveling Motor
      OK
      Headlight leveling motors operate normally.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

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


    1. Disconnect the A182 headlight leveling ECU assembly connector.

    2. Disconnect the A178 or A180 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
      A182-18 (LHT) - A178-2 (LH T) Always Below 1 Ω
      A182-11 (LH+) - A178-3 (LHIG) Always Below 1 Ω
      A182-24 (LH-) - A178-1 (LH E) Always Below 1 Ω
      A182-18 (LHT) or A178-2 (LH T) - Body ground Always 10 kΩ or higher
      A182-11 (LH+) or A178-3 (LHIG) - Body ground Always 10 kΩ or higher
      A182-24 (LH-) or A178-1 (LH E) - Body ground Always 10 kΩ or higher
      RH Side
      Tester Connection Condition Specified Condition
      A182-17 (RHT) - A180-2 (RH T) Always Below 1 Ω
      A182-10 (RH+) - A180-3 (RHIG) Always Below 1 Ω
      A182-23 (RH-) - A180-1 (RH E) Always Below 1 Ω
      A182-17 (RHT) or A180-2 (RH T) - Body ground Always 10 kΩ or higher
      A182-10 (RH+) or A180-3 (RHIG) - Body ground Always 10 kΩ or higher
      A182-23 (RH-) or A180-1 (RH E) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. REPLACE HEADLIGHT UNIT (HEADLIGHT LEVELING MOTOR)


    1. Replace the headlight unit (headlight leveling motor) with a new or known good one.

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    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the GTS on.

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

    6. Perform the Active Test according to the display on the GTS.


      Body Electrical > HL AutoLeveling > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Drive The Leveling Motor Headlight leveling motor upward or downward operation Up/Down/Stop Perform the Active Test with the engine started and vehicle stopped

      Body Electrical > HL AutoLeveling > Active Test
      Tester Display
      Drive The Leveling Motor
      OK
      Headlight leveling motors operate normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (HEADLIGHT UNIT (HEADLIGHT LEVELING MOTOR) WAS DEFECTIVE)

    NG

    REPLACE HEADLIGHT LEVELING ECU ASSEMBLY Click here