PRE-CRASH SAFETY SYSTEM TERMINALS OF ECU


  1. CHECK SEAT BELT CONTROL ECU

    A01J9ITE21

    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
      L2-7 (+B) - Body ground B - Body ground Battery voltage Always 11 to 14 V
      L2-8 (PGND) - Body ground W-B - Body ground Body ground Always Below 1 Ω
      L3-8 (IG1) - Body ground R - Body ground Seat belt control ECU power supply Power switch on (IG) 11 to 14 V
      Power 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 voltage according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      L2-2 (MOR+) - L2-1 (MOR-) B - W Seat belt motor RH power supply Power switch on (IG) 4.0 to 8.5 V
      Power switch off Below 1 V
      L2-3 (MOL+) - L2-4 (MOL-) B - W Seat belt motor LH power supply Power switch on (IG) 4.0 to 8.5 V
      Power switch off Below 1 V
      L3-5 (LBL+) - Body ground V - Body ground Front seat inner belt assembly line

      • Power switch on (IG)

      • Fasten passenger side seat belt

      Pulse generation

      (see waveform 1)
      L3-6 (LBL-) - Body ground R - Body ground Front seat inner belt assembly line Always Below 1 Ω

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

    5. Inspect using an oscilloscope.


      1. Waveform 1 (Reference)

        A01JC5ZE01
        Terminal L3-5 (LBL+) - Body ground
        Tool Setting 2V/DIV., 20 ms./DIV.
        Condition Power switch on (IG), buckle switches are not installed
        Power switch on (IG), buckle switches are installed

  2. CHECK DRIVING SUPPORT ECU

    A01JCI9E09

    1. Measure the voltage and/or resistance according to the value(s) in the table below.

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      L60-5 (PBSW) - Body ground L - Body ground Pre crash brake cancel switch Pre crash brake cancel switch ON Below 1 Ω
      Pre crash brake cancel switch off 10 kΩ or higher
      L60-17 (CA2L) - L60-25 (GND) W - W-B CAN communication signal Power switch on (IG)

      Pulse generation

      (See waveform 1)
      L60-18 (CA1N) - L60-25 (GND) L - W-B CAN communication signal Power switch on (IG)

      Pulse generation

      (See waveform 2)
      L60-23 (CCS) - L60-25 (GND) V - W-B Cruise control main switch signal Power switch on (IG) 10 to 14 V
      L60-23 (CCS) - L60-25 (GND) V - W-B Cruise control main switch signal

      Power switch on (IG),

      CANCEL switch on

      		 6.6 to 10.1 V
      L60-23 (CCS) - L60-25 (GND) V - W-B Cruise control main switch signal

      Power switch on (IG),

      Main switch on

      		 Below 1 V
      L60-25 (GND) - Body ground W-B - Body ground Body ground Always Below 1 Ω
      L60-27 (STP-) - Body ground Y - Body ground Stop light switch signal input Brake pedal depressed 7.5 to 14 V
      L60-27 (STP-) - Body ground Y - Body ground Stop light switch signal input Brake pedal released Below 1 V
      L60-28 (ST1-) - Body ground R - Body ground Stop light switch signal input

      Power switch on (IG),

      Brake pedal released

      		 7.5 to 14 V
      L60-28 (ST1-) - Body ground R - Body ground Stop light switch signal input

      Power switch on (IG),

      Brake pedal depressed

      		 Below 1 V
      L60-30 (B) - Body ground B - Body ground Power supply Power switch on (IG) 11 to 14 V
      Power switch off Below 1 V
      L60-39 (CA2H) - L60-25 (GND) B - W-B CAN communication signal Power switch on (IG)

      Pulse generation

      (See waveform 3)
      L60-40 (CA1P) - L60-25 (GND) Y - W-B CAN communication signal Power switch on (IG)

      Pulse generation

      (See waveform 4)
    2. A01J98RE19

      WAVEFORM 1


      1. CAN communication signal

        Driving support ECU Terminal Name Between CA2L and GND
        Tester Range 1 V/DIV., 10 μsec./DIV.
        Condition Power switch on (IG)

        Tech Tips

        The waveform varies depending on the CAN communication signal.

    3. A01J9HWE17

      WAVEFORM 2


      1. CAN communication signal

        Driving support ECU Terminal Name Between CA1N and GND
        Tester Range 1 V/DIV., 10 μsec./DIV.
        Condition Power switch on (IG)
    4. A01J9HWE17

      WAVEFORM 3


      1. CAN communication signal

        Driving support ECU Terminal Name Between CA2H and GND
        Tester Range 1 V/DIV., 10 μsec./DIV.
        Condition Power switch on (IG)

        Tech Tips

        The waveform varies depending on the CAN communication signal.

    5. A01J98RE19

      WAVEFORM 4


      1. CAN communication signal

        Driving support ECU Terminal Name Between CA1P and GND
        Tester Range 1 V/DIV., 10 μsec./DIV.
        Condition Power switch on (IG)