AUTOMATIC HIGH BEAM SYSTEM TERMINALS OF ECU

  1. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    B332798C11

    *A

    Main Body ECU (Multiplex Network Body ECU) with 1 Connector

    -

    -

    *1

    Main Body ECU (Multiplex Network Body ECU)

    -

    -

    *a

    1 Connector

    -

    -
    B332794C10

    *A

    Main Body ECU (Multiplex Network Body ECU) with 2 Connectors

    -

    -

    *1

    Main Body ECU (Multiplex Network Body ECU)

    -

    -

    *a

    2 Connectors

    -

    -

    1. Measure the voltage and check for pulses according to the value(s) in the table below.

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      3A-54 - Body ground

      LG - Body ground

      High beam headlight drive output

      Dimmer switch in high or high flash position

      Below 1 V

      Dimmer switch in low position

      11 to 14 V

      E22-5 (HU) - Body ground

      P - Body ground

      Dimmer switch high position signal input

      Dimmer switch in high position

      Below 1 V

      Dimmer switch not in high position

      11 to 14 V

      E22-20 (CLTB) - E22-22 (CLTE)

      W - V

      Automatic light control sensor power supply output

      Ignition switch off

      Below 1 V

      Ignition switch ON, light control switch in AUTO position

      11 to 14 V

      E22-21 (CLTS) - Body ground

      Y - Body ground

      Automatic light control sensor signal input

      Ignition switch off

      Below 1 V

      Automatic light control system operating

      Pulse generation

      (See waveform 1)

      E22-28 (A) - Body ground

      V - Body ground

      Light control switch AUTO position signal input

      Light control switch in AUTO position

      Below 1 V

      Light control switch not in AUTO position

      Pulse generation

      E22-14 (CANH) - Body ground

      G - Body ground

      CAN Communication

      Ignition switch off

      Below 1 V

      Ignition switch ON

      Pulse generation

      E22-13 (CANL) - Body ground

      W - Body ground

      CAN Communication

      Ignition switch off

      Below 1 V

      Ignition switch ON

      Pulse generation

      If the result is not as specified, the main body ECU (multiplex network body ECU) or instrument panel junction block assembly may be malfunctioning.

      1. B113714N01

        Waveform 1

        Item

        Content

        Tool setting

        5 V/DIV., 5 ms./DIV.
        Tip:

        If the ambient light becomes brighter, width A becomes narrower.