AUTOMATIC HIGH BEAM SYSTEM TERMINALS OF ECU


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

    A00076YE02
    *A for LHD *B for RHD

    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 (DIM) - 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
      H10-5 (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
      H10-17 (AHBI) - Body ground SB - Body ground Auto high beam switch signal input Power switch on (IG), auto high beam switch on Below 1 V
      Power switch on (IG), auto high beam switch off 11 to 14 V
      H10-20 (CLTB) - H10-22 (CLTE) B - P Automatic light control sensor power supply output Power switch off Below 1 V
      Power switch on (IG), light control switch in AUTO position 11 to 14 V
      H10-21 (CLTS) - Body ground LG - Body ground Automatic light control sensor signal input Power switch off Below 1 V
      Automatic light control system operates

      Pulse generation

      (See waveform 1)
      H10-28 (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. A0004N6E25

        Waveform 1

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

        Tech Tips

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

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