AUTOMATIC HIGH BEAM SYSTEM TERMINALS OF ECU


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

    B005PPOC24
    *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
      2C-31 - Body ground V - Body ground H-LP LH relay drive output Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      J8-1 (DIM) - Body ground L - Body ground H-LP RH relay drive output Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      J8-8 (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
      J8-12 (HEAD) - Body ground Y - Body ground Light control switch head position input Light control switch in head position Below 1 V
      Light control switch not in head position Pulse generation
      J8-20 (CLTS) - Body ground BE - Body ground Automatic light control sensor signal input Engine switch off Below 1 V
      Automatic light control system operating

      Communication waveform generation

      (See waveform 1)
      J8-19 (CLTB) - J8-21 (CLTE) V - Y Automatic light control sensor power supply output Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      J8-24 (HU) - Body ground GR - Body ground Dimmer switch high position signal input Dimmer switch in high position Below 1 V
      Dimmer switch not in high position Pulse generation
      J9-23 (AHBI) - Body ground G - Body ground Auto high beam switch signal input Engine switch on (IG), auto high beam switch on Below 1 V
      Engine switch on (IG), auto high beam switch off 11 to 14 V

      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. B005L22N01

        Waveform 1

        Item Content
        Tool setting 2 V/DIV., 10 ms./DIV.

        Tech Tips

        The communication waveform changes according to the surrounding brightness.

  2. CHECK FORWARD RECOGNITION CAMERA

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