TOYOTA PARKING ASSIST-SENSOR SYSTEM TERMINALS OF ECU


  1. CLEARANCE WARNING ECU ASSEMBLY

    A003NSRN31

    1. Disconnect the I28 clearance warning ECU assembly connector.

    2. Measure the voltage and resistance on the wire harness side connector according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      I28-1 (IG) - I28-30 (E) L - W-B IG power source signal Power switch off Below 1 V
      Power switch on (IG) 11 to 14 V
      I28-30 (E) - Body ground W-B - Body ground Ground Always Below 1 Ω

    3. Reconnect the I28 clearance warning ECU assembly connector.

    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
      I28-2 (CSB1) - I28-30 (E) V - W-B Power source for front side sensor circuit Power switch off Below 1 V

      • Power switch on (IG)

      • TOYOTA parking assist-sensor system on

      		 11 to 14 V
      I28-4 (BOF) - I28-30 (E) BE - W-B Power source for front sensor circuit Power switch off Below 1 V

      • Power switch on (IG)

      • TOYOTA parking assist-sensor system on

      		 11 to 14 V
      I28-5 (CSG1) - I28-30 (E) V - W-B Ground for front side clearance sonar Always Below 1 V
      I28-6 (E5) - I28-30 (E) GR - W-B Ground for front clearance sonar Always Below 1 V
      I28-7 (LIN1) - I28-30 (E) B - W-B Front side sensor communication signal (Front side clearance sonar sensor)

      • Power switch on (READY)

      • TOYOTA parking assist-sensor system on

      • Other than park (P) has been selected

      • Vehicle speed is less than approximately 10 km/h (6 mph)

      Pulse generation

      (Refer to waveform 4)
      I28-8 (SOF) - I28-30 (E) G - W-B Front sensor communication signal (Front clearance sonar sensor)

      • Power switch on (READY)

      • TOYOTA parking assist-sensor system on

      • Reverse (R) has been selected

      • Vehicle speed is less than approximately 10 km/h (6 mph)

      Pulse generation

      (Refer to waveform 1)
      I28-13 (EF) - I28-30 (E) P - W-B Ground for clearance warning buzzer Always Below 1 V
      I28-14 (CBZ) - I28-13 (EF) SB - P Clearance warning buzzer signal Buzzer sounding

      Pulse generation

      (Refer to waveform 2)
      I28-15 (BBZ) - I28-16 (ER) L - B Clearance warning buzzer signal Buzzer sounding

      Pulse generation

      (Refer to waveform 3)
      I28-16 (ER) - I28-30 (E) B - W-B Ground for clearance warning buzzer Always Below 1 V
      I28-21 (CSB2) - I28-30 (E) L - W-B Power source for rear side sensor circuit Power switch off Below 1 V

      • Power switch on (IG)

      • TOYOTA parking assist-sensor system on

      		 11 to 14 V
      I28-22 (BOR) - I28-30 (E) LG - W-B Power source for rear sensor circuit Power switch off Below 1 V

      • Power switch on (IG)

      • TOYOTA parking assist-sensor system on

      		 11 to 14 V
      I28-23 (E1) - I28-30 (E) SB - W-B Ground for rear clearance sonar Always Below 1 V
      I28-24 (SOR) - I28-30 (E) P - W-B Rear sensor communication signal (Rear clearance sonar sensor)

      • Power switch on (READY)

      • TOYOTA parking assist-sensor system on

      • Reverse (R) has been selected

      • Vehicle speed is less than approximately 10 km/h (6 mph)

      Pulse generation

      (Refer to waveform 1)
      I28-25 (CSG2) - I28-30 (E) BE - W-B Ground for rear side clearance sonar Always Below 1 V
      I28-26 (LIN2) - I28-30 (E) R - W-B Rear side sensor communication signal (Rear side clearance sonar sensor)

      • Power switch on (READY)

      • TOYOTA parking assist-sensor system on

      • Other than park (P) has been selected

      • Vehicle speed is less than approximately 10 km/h (6 mph)

      Pulse generation

      (Refer to waveform 4)

    5. Using an oscilloscope, check waveform 1.


      1. A003LRON08

        Waveform 1 (Reference)

        Item Content
        Measurement terminal

        • I28-8 (SOF) - I28-30 (E)

        • I28-24 (SOR) - I28-30 (E)
        Measurement setting 5 V/DIV., 1 ms./DIV.
        Condition

        • Power switch on (READY)

        • TOYOTA parking assist-sensor system on

        • Reverse (R) has been selected

        • Vehicle speed is less than approximately 10 km/h (6 mph)

    6. Using an oscilloscope, check waveform 2.


      1. A003LKVN05

        Waveform 2 (Reference)

        Item Content
        Measurement terminal I28-14 (CBZ) - I28-13 (EF)
        Measurement setting 2 V/DIV., 500 μs./DIV.
        Condition Buzzer sounding

        Tech Tips

        The amplitude of the waveform changes according to the set volume.

    7. Using an oscilloscope, check waveform 3.


      1. A003LKVN05

        Waveform 3 (Reference)

        Item Content
        Measurement terminal I28-15 (BBZ) - I28-16 (ER)
        Measurement setting 2 V/DIV., 1000 μs./DIV.
        Condition Buzzer sounding

        Tech Tips

        The amplitude of the waveform changes according to the set volume.

    8. Using an oscilloscope, check waveform 4.


      1. A003LRON08

        Waveform 4 (Reference)

        Item Content
        Measurement terminal

        • I28-7 (LIN1) - I28-30 (E)

        • I28-26 (LIN2) - I28-30 (E)
        Measurement setting 5 V/DIV., 1 ms./DIV.
        Condition

        • Power switch on (READY)

        • TOYOTA parking assist-sensor system on

        • Other than park (P) has been selected

        • Vehicle speed is less than approximately 10 km/h (6 mph)