AUTOMATIC HIGH BEAM SYSTEM TERMINALS OF ECU


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

    B003Z6CE05

    1. Disconnect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.

    2. Measure the voltage and 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
      4D-11 - Body ground LA - Body ground Ground Always Below 1 Ω
      4D-23 - Body ground BE - Body ground Battery power supply Always 11 to 14 V
      4K-1 - Body ground B - Body ground Battery power supply Always 11 to 14 V

    3. Connect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.

    4. 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
      F18-23 (AHBI) - Body ground LG - 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 or Pulse generation
      F18-24 (DIM) - Body ground BE - 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
      F19-8 (A) - Body ground B - Body ground Light control switch AUTO position signal input Light control switch in AUTO position Below 1 V
      Ignition switch off, light control switch not in AUTO position 11 to 14 V or Pulse generation
      F19-12 (HEAD) - Body ground W - Body ground Light control switch head position input Light control switch in head position Below 1 V
      Ignition switch off, light control switch not in head position 11 to 14 V or Pulse generation
      F19-19 (CLTB) - F19-21 (CLTE) L - G Automatic light control sensor power supply output Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      F19-20 (CLTS) - Body ground R - Body ground Automatic light control sensor signal input Ignition switch off Below 1 V
      Ignition switch ON, light control switch in AUTO position

      Communication waveform generation

      (See waveform 1)
      F19-24 (HU) - Body ground Y - Body ground Dimmer switch high position signal input Dimmer switch in high position Below 1 V
      Dimmer switch not in high position 11 to 14 V or Pulse generation

      1. A002AXON01

        Waveform 1

        Item Content
        Tester Connection F19-20 (CLTS) - Body ground
        Tool setting 2 V/DIV., 10 ms./DIV.
        Vehicle condition Ignition switch ON, light control switch in AUTO position

        Tech Tips

        The communication waveform changes according to the surrounding brightness.

  2. CHECK FORWARD RECOGNITION CAMERA

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