PRE-CRASH SAFETY SYSTEM TERMINALS OF ECU


  1. CHECK DRIVING SUPPORT ECU ASSEMBLY

    B004G0SE54

    1. Disconnect the Q1 driving support ECU assembly connector.

      Note

      Do not apply excessive force to the connector. If a force of 10 kg (22 lb) 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 safety system cancel switch assembly signal Pre-crash safety system cancel switch assembly on Below 1 Ω
      Pre-crash safety 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 Power switch on (IG) 11 to 14 V
      Power 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. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      Q1-17 (CA2L) - Q1-25 (GND) B - BR CAN communication signal Power switch on (IG)

      Pulse generation

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

      Pulse generation

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

      Pulse generation

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

      Pulse generation

      (See waveform 4)
    5. B004EZQE01

      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 Power switch on (IG)

        Tech Tips

        The waveform varies depending on the CAN communication signal.

    6. B004EZQE01

      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 Power switch on (IG)
    7. B004ESCE01

      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 Power switch on (IG)

        Tech Tips

        The waveform varies depending on the CAN communication signal.

    8. B004ESCE01

      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 Power switch on (IG)