PRE-CRASH SAFETY SYSTEM TERMINALS OF ECU


  1. CHECK DRIVING SUPPORT ECU ASSEMBLY

    A01F8CFN25

    1. Disconnect the Q1 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
      Q1-5 (PBSW) - Body ground V - Body ground Pre-crash system cancel switch assembly signal Pre-crash system cancel switch assembly on Below 1 Ω
      Pre-crash system cancel switch assembly off 10 kΩ or higher
      Q1-25 (GND) - Body ground BR - Body ground Ground Always Below 1 Ω
      Q1-30 (B) - Body ground B - 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 Q1 driving support ECU assembly connector.

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

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      Q1-17 (CA2L) - Q1-25 (GND) B - BR CAN communication signal Engine switch on (IG)

      Pulse generation

      (See waveform 1)
      Q1-18 (CA1N) - Q1-25 (GND) G - BR CAN communication signal Engine switch on (IG)

      Pulse generation

      (See waveform 2)
      Q1-39 (CA2H) - Q1-25 (GND) G - BR CAN communication signal Engine switch on (IG)

      Pulse generation

      (See waveform 3)
      Q1-40 (CA1P) - Q1-25 (GND) B - BR CAN communication signal Engine switch on (IG)

      Pulse generation

      (See waveform 4)
    5. A01F8EME01

      Waveform 1


      1. CAN communication signal

        Item Content
        Tester Connection Q1-17 (CA2L) - Q1-25 (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. A01F8EME01

      Waveform 2


      1. CAN communication signal

        Item Content
        Tester Connection Q1-18 (CA1N) - Q1-25 (GND)
        Tool Setting 1 V/DIV., 10 μsec./DIV.
        Condition Engine switch on (IG)
    7. A01F7GDE01

      Waveform 3


      1. CAN communication signal

        Item Content
        Tester Connection Q1-39 (CA2H) - Q1-25 (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. A01F7GDE01

      Waveform 4


      1. CAN communication signal

        Item Content
        Tester Connection Q1-40 (CA1P) - Q1-25 (GND)
        Tool Setting 1 V/DIV., 10 μsec./DIV.
        Condition Engine switch on (IG)