PRE-CRASH SAFETY SYSTEM TERMINALS OF ECU


  1. CHECK DRIVING SUPPORT ECU ASSEMBLY

    B005Y05N80

    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
      L205-7 (B) - L205-28 (GND) B - W-B Power source Power switch on (IG) 11 to 14 V
      Power switch off Below 1 V
      L205-3 (BZ) - L205-28 (GND) L - W-B 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
      L205-28 (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
      L205-8 (CA1P) - L205-28 (GND) B - W-B CAN communication signal Power switch on (IG)

      Pulse generation

      (See waveform 1)
      L205-9 (CA1N) - L205-28 (GND) W - W-B CAN communication signal Power switch on (IG)

      Pulse generation

      (See waveform 2)
      L205-10 (CA2H) - L205-28 (GND) B - W-B CAN communication signal Power switch on (IG)

      Pulse generation

      (See waveform 1)
      L205-11 (CA2L) - L205-28 (GND) R - W-B CAN communication signal Power switch on (IG)

      Pulse generation

      (See waveform 2)

      1. B005YT8E97
        *a 1 V/DIV.
        *b 10 μsec./DIV.

        WAVEFORM 1

        Item Content
        Terminal Name

        Between L205-8 (CA1P) - L205-28 (GND)

        Between L205-10 (CA2H) - L205-28 (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. B005XHEE89
        *a 1 V/DIV.
        *b 10 μsec./DIV.

        WAVEFORM 2

        Item Content
        Terminal Name

        Between L205-9 (CA1N) - L205-28 (GND)

        Between L205-11 (CA2L) - L205-28 (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

    B005YK1N62

    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
      A91-8 (IGB) - A91-1 (SGND) R - W-B Power source Power switch on (IG) 11 to 14 V
      A91-1 (SGND) - 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 millimeter wave radar sensor assembly is suspected.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A91-3 (CA2H) - A91-1 (SGND) B - W-B CAN communication signal Power switch on (IG)

      Pulse generation

      (See waveform 1)
      A91-2 (CA2L) - A91-1 (SGND) BR - W-B CAN communication signal Power switch on (IG)

      Pulse generation

      (See waveform 2)
      A91-5 (CA1P) - A91-1 (SGND) B - W-B CAN communication signal Power switch on (IG)

      Pulse generation

      (See waveform 1)
      A91-6 (CA1N) - A91-1 (SGND) W - W-B CAN communication signal Power switch on (IG)

      Pulse generation

      (See waveform 2)

      1. B005YT8E97
        *a 1 V/DIV.
        *b 10 μsec./DIV.

        WAVEFORM 1

        Item Content
        Terminal Name

        Between A91-3 (CA2H) and A91-1 (SGND)

        Between A91-5 (CA1P) and A91-1 (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. B005XHEE89
        *a 1 V/DIV.
        *b 10 μsec./DIV.

        WAVEFORM 2

        Item Content
        Terminal Name

        Between A91-2 (CA2L) and A91-1 (SGND)

        Between A91-6 (CA1N) and A91-1 (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.