PRE-CRASH SAFETY SYSTEM TERMINALS OF ECU


  1. CHECK SEAT BELT CONTROL ECU

    A00436UE03

    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
      L3-7 (+B) - Body ground B - Body ground Auxiliary battery voltage Power switch off 11 to 14 V
      L3-8 (PGND) - Body ground W-B - Body ground Body ground Always Below 1 Ω
      L4-8 (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

      Tech Tips

      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
      L3-2 (MOR+) - L3-1 (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
      L3-3 (MOL+) - L3-4 (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

      Tech Tips

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

  2. CHECK DRIVING SUPPORT ECU ASSEMBLY

    A004152E03

    1. Disconnect the driving support ECU assembly connector.

      Note

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

    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
      L54-30 (B) - Body ground B - Body ground Power supply Power switch on (IG) 11 to 14 V
      Power switch off Below 1 V
      L54-5 (PBSW) - Body ground L - Body ground Pre-crash brake cancel switch Pre-crash brake cancel switch assembly on Below 1 Ω
      Pre-crash brake cancel switch assembly off 10 kΩ or higher
      L54-27 (STP-) - Body ground Y - Body ground Stop light switch signal input Brake pedal depressed 7.5 to 14 V
      Brake pedal released Below 1 V
      L54-28 (ST1-) - Body ground R - Body ground Stop light switch signal input Power switch on (IG), brake pedal released 7.5 to 14 V
      Power switch on (IG), brake pedal depressed Below 1 V
      L54-25 (GND) - Body ground W-B - Body ground Body ground Always Below 1 Ω

      Tech Tips

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

    3. Reconnect the connector.

    4. Measure the waveform according to the value(s) in the table below.

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      L54-40 (CA1P) - L54-25 (GND) LG - W-B CAN communication signal Power switch on (IG)

      Pulse generation

      (See waveform 1)
      L54-18 (CA1N) - L54-25 (GND) P - W-B CAN communication signal Power switch on (IG)

      Pulse generation

      (See waveform 2)
      L54-39 (CA2H) - L54-25 (GND) B - W-B CAN communication signal Power switch on (IG)

      Pulse generation

      (See waveform 3)
      L54-17 (CA2L) - L54-25 (GND) W - W-B CAN communication signal Power switch on (IG)

      Pulse generation

      (See waveform 4)
    5. A00407HE02

      Waveform 1


      1. CAN communication signal

        Item Content
        Driving Support ECU Assembly Terminal Name Between CA1P and GND
        Tester Range 1 V/DIV., 10 μsec./DIV.
        Condition Power switch on (IG)
    6. A0040J7E01

      Waveform 2


      1. CAN communication signal

        Item Content
        Driving Support ECU Assembly Terminal Name Between CA1N and GND
        Tester Range 1 V/DIV., 10 μsec./DIV.
        Condition Power switch on (IG)
    7. A00407HE03

      Waveform 3


      1. CAN communication signal

        Item Content
        Driving Support ECU Assembly 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.

    8. A0040J7E01

      Waveform 4


      1. CAN communication signal

        Item Content
        Driving Support ECU Assembly 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.