PRE-CRASH SAFETY SYSTEM TERMINALS OF ECU


  1. CHECK DRIVING SUPPORT ECU ASSEMBLY

    B001F9QE56

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      G224-7 (B) - G224-28 (GND) G - W-B Power source Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V
      G224-3 (BZ) - G224-28 (GND) SB - W-B Skid control buzzer assembly output Ignition switch ON, buzzer not sounding 11 to 14 V
      Ignition switch ON, buzzer sounding Below 1 V
      G224-28 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

    2. Check for pulses according to the value(s) in the table below.

      Tech Tips

      If the waveform is not similar to that shown in the illustration, a malfunction of a CAN bus line, terminating resistor, or the driving support ECU assembly is suspected.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      G224-8 (CA1P) - G224-28 (GND) GR - W-B CAN communication signal Ignition switch ON

      Pulse generation

      (See waveform 1)
      G224-9 (CA1N) - G224-28 (GND) W - W-B CAN communication signal Ignition switch ON

      Pulse generation

      (See waveform 2)
      G224-10 (CA2H) - G224-28 (GND) G - W-B CAN communication signal Ignition switch ON

      Pulse generation

      (See waveform 1)
      G224-11 (CA2L) - G224-28 (GND) W - W-B CAN communication signal Ignition switch ON

      Pulse generation

      (See waveform 2)

      1. B001CSVE97
        *a 1 V/DIV.
        *b 10 μsec./DIV.

        WAVEFORM 1

        Item Content
        Terminal Name

        Between G224-8 (CA1P) - G224-28 (GND)

        Between G224-10 (CA2H) - G224-28 (GND)
        Tester Range 1 V/DIV., 10 μsec./DIV.
        Condition Ignition switch ON

        Tech Tips

        The waveform varies depending on the CAN communication signal.

      2. B001EB3E89
        *a 1 V/DIV.
        *b 10 μsec./DIV.

        WAVEFORM 2

        Item Content
        Terminal Name

        Between G224-9 (CA1N) - G224-28 (GND)

        Between G224-11 (CA2L) - G224-28 (GND)
        Tester Range 1 V/DIV., 10 μsec./DIV.
        Condition Ignition switch ON

        Tech Tips

        The waveform varies depending on the CAN communication signal.

  2. CHECK MILLIMETER WAVE RADAR SENSOR

    B001DJKE43

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A100-8 (IGB) - A100-1 (SGND) GR-G - BR Power source Ignition switch ON 11 to 14 V
      A100-1 (SGND) - Body ground BR - Body ground Ground Always Below 1 Ω

    2. Check for pulses according to the value(s) in the table below.

      Tech Tips

      If the waveform is not similar to that shown in the illustration, a malfunction of a CAN bus line, terminating resistor, or the millimeter wave radar sensor is suspected.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A100-3 (CA2H) - A100-1 (SGND) V - BR CAN communication signal Ignition switch ON

      Pulse generation

      (See waveform 1)
      A100-2 (CA2L) - A100-1 (SGND) W - BR CAN communication signal Ignition switch ON

      Pulse generation

      (See waveform 2)
      A100-5 (CA1P) - A100-1 (SGND) L - BR CAN communication signal Ignition switch ON

      Pulse generation

      (See waveform 1)
      A100-6 (CA1N) - A100-1 (SGND) W - BR CAN communication signal Ignition switch ON

      Pulse generation

      (See waveform 2)

      1. B001CSVE97
        *a 1 V/DIV.
        *b 10 μsec./DIV.

        WAVEFORM 1

        Item Content
        Terminal Name

        Between A100-3 (CA2H) and A100-1 (SGND)

        Between A100-5 (CA1P) and A100-1 (SGND)
        Tester Range 1 V/DIV., 10 μsec./DIV.
        Condition Ignition switch ON

        Tech Tips

        The waveform varies depending on the CAN communication signal.

      2. B001EB3E89
        *a 1 V/DIV.
        *b 10 μsec./DIV.

        WAVEFORM 2

        Item Content
        Terminal Name

        Between A100-2 (CA2L) and A100-1 (SGND)

        Between A100-6 (CA1N) and A100-1 (SGND)
        Tester Range 1 V/DIV., 10 μsec./DIV.
        Condition Ignition switch ON

        Tech Tips

        The waveform varies depending on the CAN communication signal.