PRE-COLLISION SYSTEM TERMINALS OF ECU


  1. CHECK DRIVING SUPPORT ECU ASSEMBLY

    B004EE8E02

    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
      Q2-7 (B) - Q2-28 (GND) B - BR Power source Power switch on (IG) 11 to 14 V
      Power switch off Below 1 V
      Q2-3 (BZ) - Q2-28 (GND) SB - BR Skid control buzzer assembly output Power switch on (IG), buzzer not sounding 11 to 14 V
      Power switch on (IG), buzzer sounding Below 1 V
      Q2-28 (GND) - 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 driving support ECU assembly is suspected.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      Q2-8 (CA1P) - Q2-28 (GND) V - BR CAN communication signal Power switch on (IG)

      Pulse generation

      (See waveform 1)
      Q2-9 (CA1N) - Q2-28 (GND) B - BR CAN communication signal Power switch on (IG)

      Pulse generation

      (See waveform 2)
      Q2-10 (CA2H) - Q2-28 (GND) G - BR CAN communication signal Power switch on (IG)

      Pulse generation

      (See waveform 1)
      Q2-11 (CA2L) - Q2-28 (GND) B - BR CAN communication signal Power switch on (IG)

      Pulse generation

      (See waveform 2)

      1. B004EWKE97
        *a 1 V/DIV.
        *b 10 μsec./DIV.

        WAVEFORM 1

        Item Content
        Terminal Name

        Between Q2-8 (CA1P) - Q2-28 (GND)

        Between Q2-10 (CA2H) - Q2-28 (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.

      2. B004G86E89
        *a 1 V/DIV.
        *b 10 μsec./DIV.

        WAVEFORM 2

        Item Content
        Terminal Name

        Between Q2-9 (CA1N) - Q2-28 (GND)

        Between Q2-11 (CA2L) - Q2-28 (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.

  2. CHECK MILLIMETER WAVE RADAR SENSOR ASSEMBLY

    B004GG2E02

    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
      B9-8 (IGB) - B9-1 (SGND) G - BR Power source Power switch on (IG) 11 to 14 V
      B9-1 (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 assembly is suspected.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      B9-3 (CA2H) - B9-1 (SGND) L - BR CAN communication signal Power switch on (IG)

      Pulse generation

      (See waveform 1)
      B9-2 (CA2L) - B9-1 (SGND) B - BR CAN communication signal Power switch on (IG)

      Pulse generation

      (See waveform 2)
      B9-5 (CA1P) - B9-1 (SGND) LG - BR CAN communication signal Power switch on (IG)

      Pulse generation

      (See waveform 1)
      B9-6 (CA1N) - B9-1 (SGND) B - BR CAN communication signal Power switch on (IG)

      Pulse generation

      (See waveform 2)

      1. B004EWKE97
        *a 1 V/DIV.
        *b 10 μsec./DIV.

        WAVEFORM 1

        Item Content
        Terminal Name

        Between B9-3 (CA2H) and B9-1 (SGND)

        Between B9-5 (CA1P) and B9-1 (SGND)
        Tester Range 1 V/DIV., 10 μsec./DIV.
        Condition Power switch on (IG)

        Tech Tips

        The waveform varies depending on the CAN communication signal.

      2. B004G86E89
        *a 1 V/DIV.
        *b 10 μsec./DIV.

        WAVEFORM 2

        Item Content
        Terminal Name

        Between B9-2 (CA2L) and B9-1 (SGND)

        Between B9-6 (CA1N) and B9-1 (SGND)
        Tester Range 1 V/DIV., 10 μsec./DIV.
        Condition Power switch on (IG)

        Tech Tips

        The waveform varies depending on the CAN communication signal.