PRE-CRASH SAFETY SYSTEM TERMINALS OF ECU


  1. CHECK SEAT BELT CONTROL ECU

    A019PHTE17

    1. Disconnect the seat belt control ECU connectors.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      F57-7 (+B) - Body ground B - Body ground Battery voltage Always 11 to 14 V
      F57-8 (PGND) - Body ground W-B - Body ground Body ground Always Below 1 Ω
      F56-8 (IG1) - Body ground Y - Body ground Seat belt control ECU power supply Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V

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

    3. Reconnect the connectors.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      F57-2 (MOR+) - F57-1 (MOR-) R - GR Seat belt motor RH power supply Engine switch on (IG) 4.0 to 8.5 V
      Engine switch off Below 1 V
      F57-3 (MOL+) - F57-4 (MOL-) L - V Seat belt motor LH power supply Engine switch on (IG) 4.0 to 8.5 V
      Engine switch off Below 1 V
      F56-5 (PBK+) - Body ground L - Body ground Front seat inner belt assembly line

      • Engine switch on (IG)

      • Fasten passenger side seat belt

      Pulse generation

      (see waveform 1)
      F56-6 (PBK-) - Body ground P - Body ground Front seat inner belt assembly line

      • Always

      		 Below 1 Ω

      If the result is not as specified, the seat belt control ECU may be malfunctioning.

    5. Inspect using an oscilloscope.


      1. Waveform 1 (Reference)

        A019MA7E01
        Terminal F56-5 (PBK+) - Body ground
        Tool Setting 2V/DIV., 20 ms./DIV.
        Condition Engine switch on (IG), buckle switches are not installed
        Engine switch on (IG), buckle switches are installed

  2. CHECK DRIVING SUPPORT ECU

    A019ML9E02

    1. Disconnect the driving support ECU connector.

    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
      C1-30 (B) - Body ground P - Body ground Power supply Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      C1-25 (GND) - Body ground W-B - Body ground Body ground Always Below 1 Ω

    3. Connect the driving support ECU connector.

    4. Turn the engine switch on (IG).

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      C1-7 (MODE) - Body ground Y - Body ground MODE signal

      • -Engine switch on (IG)

      • -MODE switch OFF

      		 11 to 14 V

      • -Engine switch on (IG)

      • -MODE switch ON

      		 Below 1 V
      C1-32 (WIP2) - Body ground SB - Body ground Wiper signal

      • -Engine switch on (IG)

      • -Wiper switch OFF

      		 Below 1 V

      • -Engine switch on (IG)

      • -Wiper switch ON

      		 11 to 14 V
      C1-18 (CA1N) - C1-25 (GND) L - W-B CAN communication signal Engine switch on (IG)

      Pulse generation

      (see waveform 1)
      C1-40 (CA1P) - C1-25 (GND) B - W-B Driving support ECU communication signal Engine switch on (IG)

      Pulse generation

      (see waveform 2)
      C1-39 (CA2H) - C1-25 (GND) B - W-B CAN communication signal Engine switch on (IG)

      Pulse generation

      (see waveform 3)
      C1-17 (CA2L) - C1-25 (GND) W - W-B CAN communication signal Engine switch on (IG)

      Pulse generation

      (see waveform 4)

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

    6. Waveform 1


      1. A019PAUE02

        CAN communication signal

        Terminal C1-18 (CA1N) - C1-25 (GND)
        Tool Setting 1 V/DIV., 10 μsec./DIV.
        Condition Engine switch on (IG)

    7. Waveform 2


      1. A019L1QE01

        CAN communication signal

        Terminal C1-40 (CA1P) - C1-25 (GND)
        Tool Setting 1 V/DIV., 10 μsec./DIV.
        Condition Engine switch on (IG)

    8. Waveform 3


      1. A019L1QE01

        CAN communication signal

        Terminal C1-39 (CA2H) - C1-25 (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.

    9. Waveform 4


      1. A019PAUE03

        CAN communication signal

        Terminal C1-17 (CA2L) - C1-25 (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.