AUTOMATIC HIGH BEAM SYSTEM TERMINALS OF ECU


  1. CHECK AFS ECU (HEADLIGHT SWIVEL ECU ASSEMBLY)

    A00YA9FN01

    1. Disconnect the A93 AFS ECU (headlight swivel ECU assembly) connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A93-22 (E1) - Body ground W-B - Body ground AFS ECU (headlight swivel ECU assembly) ground Always Below 1 Ω

      If the result is not as specified, there may be a malfunction in the wire harness.

    3. Measure the voltage according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A93-15 (IG) - Body ground L - Body ground AFS ECU (headlight swivel ECU assembly) power supply Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V

      If the result is not as specified, there may be a malfunction in the wire harness.

    4. Reconnect the A93 AFS ECU (headlight swivel ECU assembly) connector.

    5. 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
      A93-30 (LHT) - A93-22 (E1) LG - W-B LIN communication Ignition switch off Below 1 V
      Ignition switch ON Pulse generation
      A93-12 (CANH) - A93-22 (E1) Y - W-B CAN communication Ignition switch off Below 1 V
      Ignition switch ON Pulse generation
      A93-13 (CANL) - A93-22 (E1) W - W-B CAN communication Ignition switch off Below 1 V
      Ignition switch ON Pulse generation

      If the result is not as specified, the AFS ECU (headlight swivel ECU assembly) may be malfunctioning.

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

    A00Y6QDC11
    *A Main Body ECU (Multiplex Network Body ECU) with 1 Connector - -
    *1 Main Body ECU (Multiplex Network Body ECU) - -
    *a 1 Connector - -
    A00Y8J8C10
    *A Main Body ECU (Multiplex Network Body ECU) with 2 Connectors - -
    *1 Main Body ECU (Multiplex Network Body ECU) - -
    *a 2 Connectors - -

    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
      3A-54 - Body ground LG - 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
      E22-5 (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 11 to 14 V
      E22-20 (CLTB) - E22-22 (CLTE) W - V Automatic light control sensor power supply output Ignition switch off Below 1 V
      Ignition switch ON, light control switch in AUTO position 11 to 14 V
      E22-21 (CLTS) - Body ground Y - Body ground Automatic light control sensor signal input Ignition switch off Below 1 V
      Automatic light control system operating

      Pulse generation

      (See waveform 1)
      E22-28 (A) - Body ground V - 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
      E22-14 (CANH) - Body ground G - Body ground CAN Communication Ignition switch off Below 1 V
      Ignition switch ON Pulse generation
      E22-13 (CANL) - Body ground W - Body ground CAN Communication Ignition switch off Below 1 V
      Ignition switch ON Pulse generation

      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. A00Y4W2N01

        Waveform 1

        Item Content
        Tool setting 5 V/DIV., 5 ms./DIV.

        Tech Tips

        If the ambient light becomes brighter, width A becomes narrower.

  3. CHECK INNER REAR VIEW MIRROR ASSEMBLY

    A00Y72GN02

    1. Disconnect the O3 inner rear view mirror assembly connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      O3-1 (E) - Body ground W-B - Body ground Inner rear view mirror assembly ground Always Below 1 Ω

      If the result is not as specified, there may be a malfunction in the wire harness.

    3. Measure the voltage according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      O3-4 (IG) - Body ground L - Body ground Inner rear view mirror assembly power supply Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V

      If the result is not as specified, there may be a malfunction in the wire harness.

    4. Reconnect the O3 inner rear view mirror assembly connector.

    5. Measure the voltage or check for pulses according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      O3-5 (LIN) - O3-1 (E) LG - W-B LIN communication Ignition switch off Below 1 V
      Automatic high beam system operating

      Pulse generation

      (See waveform 1)

      If the result is not as specified, the inner rear view mirror assembly may be malfunctioning.


      1. A00Y7LHN01

        Waveform 1

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