AUTOMATIC HIGH BEAM SYSTEM TERMINALS OF ECU


  1. CHECK COWL SIDE JUNCTION BLOCK LH AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    B002BJJE18
    Text in Illustration
    *1 Main Body ECU (Multiplex Network Body ECU) - -

    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
      5D-21 (DIM) - Body ground LG - Body ground RH LAMP relay drive output Power switch off Below 1 V
      Power switch on (IG) 11 to 14 V
      N12-28 (A) - Body ground R - 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
      N12-29 (HEAD) - Body ground LG - 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
      N12-21 (CLTS) - Body ground R - Body ground Automatic light control sensor signal input Power switch off Below 1 V
      Automatic light control system operating

      Communication waveform generation

      (See waveform 1)
      N12-20 (CLTB) - N12-22 (CLTE) GR - W Automatic light control sensor power supply output Power switch off Below 1 V
      Power switch on (IG) 11 to 14 V
      N12-5 (HU) - Body ground P - Body ground Dimmer switch high position signal input Dimmer switch in high position Below 1 V
      Dimmer switch not in high position Pulse generation
      N13-17 (AHBI) - Body ground Y - 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

      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. B002B5JE01

        Waveform 1

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

        Tech Tips

        The communication waveform changes according to the surrounding brightness.

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