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

A00080ZE04
*a from H-LP Relay
*b Instrument Panel Junction Block Assembly
*c Main Body ECU (Multiplex Network Body ECU)
*d Headlight Leveling ECU Assembly

CAUTION / NOTICE / HINT

Note

First check that the low beam headlights operate normally.

PROCEDURE


  1. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

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

    5. Read the display on the GTS.

      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.

    OK

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

    NG

  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 A29 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 - A29-3 (HDLP) 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. A0005WKE03
      Text in Illustration
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      Remove the instrument panel junction block assembly Click here.

    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

    OK

    REPLACE HEADLIGHT LEVELING ECU ASSEMBLY Click here

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here