PRE-CRASH SAFETY SYSTEM TERMINALS OF ECU


  1. CHECK SEAT BELT CONTROL ECU

    A003ZLZE38

    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
      H6-7 (+B) - Body ground B - Body ground Auxiliary battery voltage Power switch off 11 to 14 V
      H6-8 (PGND) - Body ground W-B - Body ground Body ground Always Below 1 Ω
      H7-8 (IG1) - Body ground L - Body ground Seat belt control ECU power supply Power switch on (IG) 11 to 14 V
      Power switch off Below 1 V
      H7-6 (PBK-) - Body ground R - Body ground Front seat inner belt assembly (Passenger side) Always Below 1 Ω

      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 and check for pulses according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      H6-2 (MOR+) - H6-1 (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
      H6-3 (MOL+) - H6-4 (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
      H7-5 (PBK+) - H7-6 (PBK-) V - R Front seat inner belt assembly (Passenger side) Power switch on (IG), front seat belt fastened → unfastened

      Pulse generation

      (See waveform 1)

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

    5. Using an oscilloscope, check waveform 1.

      A003ZOSE02
      Text in Illustration
      *a Front seat belt fastened *b Front seat belt unfastened
      Measurement Condition (Waveform 1)
      Item Content
      Tester Connection H7-5 (PBK+) - H7-6 (PBK-)
      Tool Setting 2 V/DIV., 20 ms./DIV.
      Condition

      Power switch on (IG), front seat belt fastened → unfastened

      (Passenger side)

  2. CHECK DRIVING SUPPORT ECU ASSEMBLY

    A003XFGE17

    1. Disconnect the driving support ECU assembly connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      H5-25 (GND) - Body ground W-B - Body ground Body ground Always Below 1 Ω
      H5-5 (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

      *: w/ Pre-crash Brake

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

    3. Reconnect the connector.

    4. Measure the voltage and check for pulses according to the value(s) in the table below.

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      H5-7 (MODE) - H5-25 (GND) R - W-B

      Steering pad switch signal

      (distance control signal)

      Power switch on (IG)

      Distance control switch off

      		 11 to 14 V
      H5-7 (MODE) - H5-25 (GND) R - W-B

      Steering pad switch signal

      (distance control signal)

      Power switch on (IG)

      Distance control switch on

      		 6 to 7 V
      H5-17 (CA2L) - H5-25 (GND) B - W-B CAN communication signal Power switch on (IG)

      Pulse generation

      (See waveform 1)
      H5-18 (CA1N) - H5-25 (GND) P - W-B CAN communication signal Power switch on (IG)

      Pulse generation

      (See waveform 1)
      H5-23 (CCS) - H5-25 (GND) LG - W-B Cruise control switch signal Power switch on (IG) 11 to 14 V
      H5-23 (CCS) - H5-25 (GND) LG - W-B Cruise control switch signal

      Power switch on (IG),

      CANCEL switch on

      		 6.6 to 10.1 V
      H5-23 (CCS) - H5-25 (GND) LG - W-B Cruise control switch signal

      Power switch on (IG),

      -/SET switch on

      		 4.5 to 7.1 V
      H5-23 (CCS) - H5-25 (GND) LG - W-B Cruise control switch signal

      Power switch on (IG),

      +/RES switch on

      		 2.3 to 4.0 V
      H5-23 (CCS) - H5-25 (GND) LG - W-B Cruise control switch signal

      Power switch on (IG),

      Cruise control switch on

      		 Below 1 V
      H5-39 (CA2H) - H5-25 (GND) L - W-B CAN communication signal Power switch on (IG)

      Pulse generation

      (See waveform 2)
      H5-40 (CA1P) - H5-25 (GND) LG - W-B CAN communication signal Power switch on (IG)

      Pulse generation

      (See waveform 2)
    5. A003Z16E19

      Waveform 1


      1. CAN communication signal

        Item Content
        Driving Support ECU Assembly Terminal Name

        Between CA2L and GND

        Between CA1N 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.

    6. A003YOBE17

      Waveform 2


      1. CAN communication signal

        Item Content
        Driving Support ECU Assembly Terminal Name

        Between CA2H and GND

        Between CA1P 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.