AUTOMATIC HIGH BEAM SYSTEM Automatic High Beam Switch Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) detects auto high beam switch signals.

The automatic high beam system can be turned on and off by operating the auto high beam switch.

WIRING DIAGRAM

A018MEUE09

CAUTION / NOTICE / HINT

Note


  • If the main body ECU (multiplex network body ECU) is replaced, refer to Service Bulletin.*


    • *: w/ Smart Entry and Start System

  • As the door control battery is installed between the vehicle battery and main body ECU (multiplex network body ECU), first perform the inspections in On-Vehicle Inspection to confirm that there are no malfunctions in the power source circuit for the main body ECU (multiplex network body ECU) before performing this troubleshooting procedure.*

    Click here


    • *: for LHD

PROCEDURE


  1. READ VALUE 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 / Main Body / Data List.

    5. Read the display on the GTS.


      Body Electrical > Main Body > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Auto High Beam Main Switch Auto high beam switch signal ON or OFF

      ON: Auto high beam switch pressed

      OFF: Auto high beam switch not pressed

      -
      OK
      Normal conditions listed above are displayed.
      Result
      Proceed to
      OK
      NG

    OK
    NG
  2. INSPECT AUTO HIGH BEAM SWITCH


    1. Remove the auto high beam switch.

      Click here

    2. Inspect the auto high beam switch.

      Click here

      Result
      Proceed to
      OK
      NG

    NG
    OK
  3. CHECK HARNESS AND CONNECTOR (AUTO HIGH BEAM SWITCH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND BODY GROUND)


    1. Disconnect the F18 main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F8-4 (+B) - F18-23 (AHBI) Always Below 1 Ω
      F8-4 (+B) - Body ground Always 10 kΩ or higher
      F8-1 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK
    NG