AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM Headlight Signal Circuit

DESCRIPTION

The headlight leveling ECU assembly detects the status of the low beam headlights.

WIRING DIAGRAM

A011S70E01

INSPECTION PROCEDURE

Note

First check that the low beam headlights operate normally.

PROCEDURE

  1. READ VALUE USING TECHSTREAM

    1. Connect the Techstream to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the Techstream on.

    4. Enter the following menus: Body Electrical / HL Auto Leveling / Data List.

    5. Read the display on the Techstream.

      HL Auto Leveling
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Headlight Low Beam State Low beam headlight state/ON or OFF

      ON: Low beam headlights on

      OFF: Low beam headlights off

      		 -
      OK
      Normal conditions listed above are displayed.
    NG

    CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK 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 (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - HEADLIGHT LEVELING ECU ASSEMBLY)

    1. Disconnect the 3D instrument panel junction block assembly connector.

    2. Disconnect the A34 headlight leveling ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3D-11 - A34-3 (B2) Always Below 1 Ω
      3D-11 - Body ground Always 10 kΩ or higher
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    1. Remove the instrument panel junction block assembly Click here.

      A011UNOE01

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3D-11 - 3D-12 Always Below 1 Ω
      3D-11 - Body ground Always 10 kΩ or higher
      Text in Illustration
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)
    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    OK

    REPLACE HEADLIGHT LEVELING ECU ASSEMBLY Click here