AUTOMATIC HIGH BEAM SYSTEM TERMINALS OF ECU


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

    A00YV8EN02
    A00YX3RC04
    *A Main Body ECU (Multiplex Network Body ECU) with 1 connector *B Main Body ECU (Multiplex Network Body ECU) with 3 connectors
    *1 Main Body ECU (Multiplex Network Body ECU) - -

    1. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

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    2. Connect the instrument panel junction block assembly connectors.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A-32 (IG) - Body ground - Ignition power supply Ignition switch ON

      11 to 14 V*1

      10.5 to 14 V*2
      Ignition switch off Below 1 V
      A-30 (BECU) - Body ground - Battery power supply Always 11 to 14 V
      A-29 (ACC) - Body ground - ACC power supply Ignition switch ACC 11 to 14 V
      Ignition switch off Below 1 V
      A-11 (GND1) - Body ground - Ground Always Below 1 Ω

      *1: w/o Stop and Start System

      *2: w/ Stop and Start System

      If the result is not as specified, there may be a malfunction in the wire harness or instrument panel junction block assembly.

    4. Install the main body ECU (multiplex network body ECU).

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    5. Measure the voltage and pulse according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      3B-54 (DIM) - Body ground LG - Body ground DIMMER relay drive output Headlight dimmer switch in high or high flash position Below 1 V
      Headlight dimmer switch not in high or high flash position 11 to 14 V
      G78-5 (HU) - Body ground Y - Body ground Headlight dimmer switch high signal input Headlight dimmer switch in high position Below 1 V
      Headlight dimmer switch in low position

      Pulse generation*1

      11 to 14 V*2
      G78-20 (CLTB) - G78-22 (CLTE) W - V Automatic light control sensor power supply output Ignition switch off Below 1 V

      Ignition switch ON

      Headlight dimmer switch in AUTO position

      		 11 to 14 V
      G78-21 (CLTS) - Body ground G - Body ground Automatic light control sensor signal input Ignition switch off Below 1 V

      Ignition switch ON

      Headlight dimmer switch in AUTO position

      Automatic light control sensor covered with a hand → Automatic light control sensor exposed to ambient light

      		 Pulse generation (See waveform 1)
      G78-28 (A) - Body ground G - Body ground Headlight dimmer switch AUTO position signal input Headlight dimmer switch in AUTO position Below 1 V
      Headlight dimmer switch not in AUTO position

      Pulse generation*1

      11 to 14 V*2

      *1: Main Body ECU (multiplex network body ECU) with 3 Connectors

      *2: Main Body ECU (multiplex network body ECU) with 1 Connectors


      1. A00YVWWE01

        Waveform 1

        Item Content
        Terminal No. (Symbol) G78-21 (CLTS) - Body ground
        Tool setting 5 V/DIV., 5 ms./DIV.
        Condition

        Ignition switch ON

        Headlight dimmer switch in AUTO position

        Automatic light control sensor covered with a hand → Automatic light control sensor exposed to ambient light

        Tech Tips

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

  2. CHECK LANE DEPARTURE WARNING CAMERA


    1. Check the lane departure warning camera.

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