AUTOMATIC HIGH BEAM SYSTEM TERMINALS OF ECU


  1. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU

    A01VJ2CE02
    Text in Illustration
    *A for LHD *B for RHD
    *1 Instrument Panel Junction Block Assembly *2 Main Body ECU

    1. Remove the main body ECU connectors.

    2. Measure the voltage and resistance according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      MB-30 (BECU) - Body ground - Battery power supply Ignition switch off 11 to 14 V
      MB-29 (ACC) - Body ground - ACC power supply Ignition switch ACC 11 to 14 V
      MB-11 (GND1) - Body ground - Body ground Always Below 1 Ω
    3. Reinstall the main body ECU connectors.

    4. Measure the voltage and waveform according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      3C-35 (DIM) - 3B-8 (GND1) P - W-B Dimmer relay drive output Dimmer switch in high or high flash position Below 1 V
      Dimmer switch not in high or high flash position 11 to 14 V
      F76-21 (CLTS) - 3B-8 (GND1) B - W-B Automatic light control sensor signal input Ignition switch ON Below 1 V
      With the ignition switch ON and the light control switch in the AUTO position, cover the top of the automatic light control sensor with a lightproof object, and then expose the sensor Pulse generation (waveform varies depending on light volume) (Waveform 1)
      F76-28 (A) - 3B-8 (GND1) V - W-B Light control switch AUTO position signal input Light control switch in AUTO position Below 1 V
      Light control switch not in AUTO position 11 to 14 V
      F76-5 (HU) - 3B-8 (GND1) P - W-B Dimmer switch high position signal input Dimmer switch in high or high flash position Below 1 V
      Dimmer switch in low position 11 to 14 V
      F76-14 (CANH) - Body ground Body ground CAN communication line Ignition switch ON Pulse generation
      F76-13 (CANL) - Body ground W - Body ground CAN communication line Ignition switch ON Pulse generation

      1. A01VEL4E01

        Waveform 1

        Item Content
        Terminal No. (Symbol) F76-21 (CLTS) - 3B-8 (GND1)
        Tool setting 5 V/DIV., 5 ms/DIV.
        Condition With the ignition switch ON and the light control switch in the AUTO position, cover the top of the automatic light control sensor with a lightproof object, and then expose the sensor

        Tech Tips

        The brighter the surrounding area, the narrower width A becomes.

  2. PRE-CRASH SAFETY CITY SENSOR Click here