AUTOMATIC HIGH BEAM SYSTEM TERMINALS OF ECU


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

    B000IF2E02

    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
      3D-39 - Body ground W - 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
      I13-5 (HU) - Body ground LG - Body ground Dimmer switch high position signal input Dimmer switch in high position Below 1 V
      Dimmer switch not in high position Pulse generation
      I13-20 (CLTB) - I13-22 (CLTE) B - P 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
      I13-21 (CLTS) - Body ground G - Body ground Automatic light control sensor signal input Ignition switch off Below 1 V
      Automatic light control system operating

      Pulse generation

      (See waveform 1)
      I13-28 (A) - Body ground G - 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

      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. B000JYXE01

        Waveform 1

        Item Content
        Tool setting 5 V/DIV., 5 ms./DIV.

        Tech Tips

        As the ambient light becomes brighter, width (A) becomes narrower.

  2. CHECK INNER REAR VIEW MIRROR ASSEMBLY

    B000L0WE02

    1. Disconnect the S2 inner rear view mirror assembly connector.

    2. Measure the resistance on the wire harness side connector according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      S2-1 (E) - Body ground W-B - Body ground Inner rear view mirror assembly ground Always Below 1 Ω

      If the result is not as specified, there may be a malfunction in the wire harness.

    3. Measure the voltage on the wire harness side connector according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      S2-4 (IG) - Body ground GR - Body ground Inner rear view mirror assembly power supply Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V

      If the result is not as specified, there may be a malfunction in the wire harness.

    4. Reconnect the S2 inner rear view mirror assembly connector.

    5. Check for pulses according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      S2-2 (CANL) - S2-3 (CANH) W - R CAN communication system CAN communication is being performed Pulse generation

      If the result is not as specified, the inner rear view mirror assembly may be malfunctioning.