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

DTC Code DTC Name
Headlight Beam Level Control Actuator Circuit

DESCRIPTION

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

WIRING DIAGRAM

E303871E07

CAUTION / NOTICE / HINT

Note:

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

Click here

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

      Table 1. 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
      Table 2. 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.

      Click here

    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