AUTOMATIC HIGH BEAM SYSTEM TERMINALS OF ECU


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

    B004FQWN71

    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
      4C-29 - Body ground*1 R - Body ground MIR HTR/H-LP LH relay drive output Light control switch in head position Below 1 V
      Light control switch not in head position 11 to 14 V
      O1-23 (AHBI) - Body ground SB - Body ground Auto high beam switch signal input Auto high beam switch on Below 1 V
      Auto high beam switch off 11 to 14 V
      O2-1 (DIM) - Body ground*1 V - Body ground H-LP RH relay drive output Light control switch in head position Below 1 V
      Light control switch not in head position 11 to 14 V
      O2-1 (DIM) - Body ground*2 V - 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
      O2-8 (A) - Body ground P - 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
      O2-19 (CLTB) - O2-21 (CLTE) GR - W 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
      O2-20 (CLTS) - Body ground R - Body ground Automatic light control sensor signal input Power switch off Below 1 V
      Power switch on (IG)

      Pulse generation

      (See waveform 1)
      O2-24 (HU) - Body ground V - Body ground Dimmer switch high position signal input Dimmer switch in high position Below 1 V
      Dimmer switch not in high position Pulse generation

      • *1: for Triple Beam Headlight

      • *2: for Single Beam Headlight


      1. B004FQSN01

        Waveform 1

        Item Content
        Tester Connection O2-20 (CLTS) - Body ground
        Tool setting 2 V/DIV., 10 ms./DIV.
        Condition Power switch on (IG)

        Tech Tips

        The communication waveform changes according to the surrounding brightness.

  2. CHECK FORWARD RECOGNITION CAMERA

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