LEXUS PARKING ASSIST-SENSOR SYSTEM TERMINALS OF ECU


  1. CLEARANCE WARNING ECU ASSEMBLY

    A01FRWME01

    1. Disconnect the N10 connector from the clearance warning ECU assembly.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      N10-1 (IG) - N10-30 (E) LG - W-B IG power source signal Power switch off Below 1.5 V
      Power switch on (IG) 11 to 14 V
      N10-9 (CLSW) - N10-30 (E) SB - W-B Back sonar or clearance sonar switch power source signal Power switch on (IG), back sonar or clearance sonar switch on 11 to 14 V
      Power switch on (IG), back sonar or clearance sonar switch off Below 1 V
      N10-30 (E) - Body ground W-B - Body ground Ground Always Below 1 Ω

    3. Reconnect the N10 connector to the clearance warning ECU assembly.

    4. Measure the voltage and resistance, and check for pulses according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      N10-4 (BOF) - N10-30 (E) R - W-B Power source for front sensor circuit Power switch off Below 1.5 V
      Power switch on (IG), back sonar or clearance sonar switch on 7.2 to 8.8 V
      N10-6 (E5) - N10-30 (E) G - W-B Ground for front clearance sonar Always Below 1 Ω
      N10-8 (SOF) - N10-30 (E) SB - W-B Front sensor communication signal (Front clearance sonar sensor) Hybrid control system starts, back sonar or clearance sonar switch on, reverse (R) selected

      Pulse generation

      (See waveform 1)
      N10-15 (CBZ) - N10-30 (E) LG - W-B Clearance warning buzzer signal Power switch off Below 1 V
      Hybrid control system starts, back sonar or clearance sonar switch on, reverse (R) selected 11 to 14 V
      N10-16 (EF) - N10-30 (E) L - W-B Ground of clearance warning buzzer When sonar detects obstacle (buzzer sounds)

      Pulse generation

      (See waveform 2)
      N10-22 (BOR) - N10-30 (E) GR - W-B Power source for rear sensor circuit Power switch off Below 1.5 V
      Power switch on (IG), back sonar or clearance sonar switch on 7.2 to 8.8 V
      N10-23 (E1) - N10-30 (E) W - W-B Ground for rear clearance sonar Always Below 1 Ω
      N10-24 (SOR) - N10-30 (E) P - W-B Rear sensor communication signal (Rear clearance sonar sensor) Hybrid control system starts, back sonar or clearance sonar switch on, reverse (R) selected

      Pulse generation

      (See waveform 1)

    5. Using an oscilloscope, check waveform 1.


      1. A01FVAIE01

        Waveform 1 (Reference)

        Item Content
        Terminal No. (Symbol)

        • CH: 1 N10-8 (SOF) - N10-30 (E)

        • CH: 2 N10-24 (SOR) - N10-30 (E)
        Tool Setting 5 V/DIV., 1 msec./DIV.
        Condition Hybrid control system starts, back sonar or clearance sonar switch on, reverse (R) selected

        Tech Tips

        The waveforms for CH1 and CH2 are same.

    6. Using an oscilloscope, check waveform 2.


      1. A01FR5CE01

        Waveform 2 (Reference)

        Item Content
        Terminal No. (Symbol) N10-16 (EF) - N10-30 (E)
        Tool Setting 2 V/DIV., 500 μsec./DIV.
        Vehicle Condition When sonar detects obstacle (buzzer sounds)

        Tech Tips

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