LEXUS PARKING ASSIST-SENSOR SYSTEM(w/o Intelligent Clearance Sonar System) TERMINALS OF ECU


  1. CLEARANCE WARNING ECU ASSEMBLY

    B005LBUN21

    1. Disconnect the J38 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
      J38-1 (IG) - J38-30 (E) SB - W-B IG power source signal Engine switch off Below 1 V
      Engine switch on (IG)

      11 to 14 V*1

      10.5 to 16 V*2
      J38-30 (E) - Body ground W-B - Body ground Ground Always Below 1 Ω

      • *1: w/o Stop and Start System

      • *2: w/ Stop and Start System

    3. Reconnect the J38 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
      J38-4 (BOF) - J38-30 (E) P - W-B Power source for front sensor circuit Engine switch off Below 1 V

      • Engine switch on (IG)

      • LEXUS parking assist-sensor system on

      		 11 to 14 V
      J38-6 (E5) - J38-30 (E) L - W-B Ground for front clearance sonar Always Below 1 V
      J38-8 (SOF) - J38-30 (E) B - W-B Front sensor communication signal (Front clearance sonar sensor)

      • Engine switch on (IG)

      • LEXUS parking assist-sensor system on

      • Shift lever in R

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

      Pulse generation

      (Refer to waveform 1)
      J38-13 (EF) - J38-30 (E) P - W-B Ground for clearance warning buzzer Always Below 1 V
      J38-14 (CBZ) - J38-13 (EF) Y - P Clearance warning buzzer signal Buzzer sounding

      Pulse generation

      (Refer to waveform 2)
      J38-22 (BOR) - J38-30 (E) LG - W-B Power source for rear sensor circuit Engine switch off Below 1 V

      • Engine switch on (IG)

      • LEXUS parking assist-sensor system on

      		 11 to 14 V
      J38-23 (E1) - J38-30 (E) GR - W-B Ground for rear clearance sonar Always Below 1 V
      J38-24 (SOR) - J38-30 (E) SB - W-B Rear sensor communication signal (Rear clearance sonar sensor)

      • Engine switch on (IG)

      • LEXUS parking assist-sensor system on

      • Shift lever in R

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

      Pulse generation

      (Refer to waveform 1)

    5. Using an oscilloscope, check waveform 1.


      1. B005PYAN04

        Waveform 1 (Reference)

        Item Content
        Measurement terminal

        • CH1: J38-8 (SOF) - J38-30 (E)

        • CH2: J38-24 (SOR) - J38-30 (E)
        Measurement setting 5 V/DIV., 1 ms./DIV.
        Condition

        • Engine switch on (IG)

        • LEXUS parking assist-sensor system on

        • Shift lever in R

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

        Tech Tips

        The waveforms for CH1 and CH2 are same.

    6. Using an oscilloscope, check waveform 2.


      1. B005M3GN05

        Waveform 2 (Reference)

        Item Content
        Measurement terminal J38-14 (CBZ) - J38-13 (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.