PRE-COLLISION SYSTEM TERMINALS OF ECU


  1. CHECK DRIVING SUPPORT ECU ASSEMBLY

    A01HXSVE27

    1. Disconnect the I187 driving support ECU assembly connector.

      Note

      Do not apply excessive force to the connector. If a force of 10 kg or more is applied, the connector may break.

    2. Measure the resistance and voltage 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
      I187-5 (PBSW) - Body ground G - Body ground Pre-collision system cancel switch assembly signal Pre-collision system cancel switch assembly on Below 1 Ω
      Pre-collision system cancel switch assembly off 10 kΩ or higher
      I187-25 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      I187-30 (B) - Body ground V - Body ground Power source Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V

      Tech Tips

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

    3. Reconnect the I187 driving support ECU assembly connector.

    4. Check for pulses according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      I187-17 (CA2L) - I187-25 (GND) LG - W-B CAN communication signal Engine switch on (IG)

      Pulse generation

      (See waveform 1)
      I187-18 (CA1N) - I187-25 (GND) W - W-B CAN communication signal Engine switch on (IG)

      Pulse generation

      (See waveform 2)
      I187-39 (CA2H) - I187-25 (GND) L - W-B CAN communication signal Engine switch on (IG)

      Pulse generation

      (See waveform 3)
      I187-40 (CA1P) - I187-25 (GND) R - W-B CAN communication signal Engine switch on (IG)

      Pulse generation

      (See waveform 4)
    5. A01I096E01

      Waveform 1


      1. CAN communication signal

        Item Content
        Tester Connection I187-17 (CA2L) - I187-25 (GND)
        Tool Setting 1 V/DIV., 10 μsec./DIV.
        Condition Engine switch on (IG)

        Tech Tips

        The waveform varies depending on the CAN communication signal.

    6. A01I096E01

      Waveform 2


      1. CAN communication signal

        Item Content
        Tester Connection I187-18 (CA1N) - I187-25 (GND)
        Tool Setting 1 V/DIV., 10 μsec./DIV.
        Condition Engine switch on (IG)

        Tech Tips

        The waveform varies depending on the CAN communication signal.

    7. A01I10DE11

      Waveform 3


      1. CAN communication signal

        Item Content
        Tester Connection I187-39 (CA2H) - I187-25 (GND)
        Tool Setting 1 V/DIV., 10 μsec./DIV.
        Condition Engine switch on (IG)

        Tech Tips

        The waveform varies depending on the CAN communication signal.

    8. A01I10DE11

      Waveform 4


      1. CAN communication signal

        Item Content
        Tester Connection I187-40 (CA1P) - I187-25 (GND)
        Tool Setting 1 V/DIV., 10 μsec./DIV.
        Condition Engine switch on (IG)

        Tech Tips

        The waveform varies depending on the CAN communication signal.