LEXUS PARKING ASSIST-SENSOR SYSTEM TERMINALS OF ECU


  1. CLEARANCE WARNING ECU ASSEMBLY

    A01FI8KE01

    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
      N10-9 (CLSW) - N10-30 (E) SB - W-B Back sonar or clearance sonar switch power source signal Engine switch on (IG), back sonar or clearance sonar switch on 11 to 14 V
      Engine switch on (IG), back sonar or clearance sonar switch off Below 1 V
      N10-1 (IG) - N10-30 (E) LG - W-B IG power source signal Engine switch off Below 1.5 V
      Engine switch on (IG) 11 to 14 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
      N10-22 (BOR) - N10-30 (E) GR - W-B Power source for rear sensor circuit Engine switch off Below 1.5 V
      Engine switch on (IG), LEXUS parking assist-sensor system on 7.2 to 8.8 V
      N10-8 (SOF) - N10-30 (E) SB - W-B Front sensor communication signal (Front clearance sonar sensor) Engine starts, LEXUS parking assist-sensor system on, reverse (R) selected

      Pulse generation

      (See waveform 2)
      N10-15 (CBZ) - N10-30 (E) LG - W-B Clearance warning buzzer signal Engine switch off Below 1 V
      Engine starts, LEXUS parking assist-sensor system 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 1)
      N10-23 (E1) - N10-30 (E) W - W-B Ground for rear clearance sonar Always Below 1 Ω
      N10-6 (E5) - N10-30 (E) G - W-B Ground for front clearance sonar Always Below 1 Ω
      N10-4 (BOF) - N10-30 (E) R - W-B Power source for front sensor circuit Engine switch off Below 1.5 V
      Engine switch on (IG), LEXUS parking assist-sensor system on 7.2 to 8.8 V
      N10-24 (SOR) - N10-30 (E) P - W-B Rear sensor communication signal (Rear clearance sonar sensor) Engine Starts, LEXUS parking assist-sensor system on, reverse (R) selected

      Pulse generation

      (See waveform 2)

    5. Using an oscilloscope, check waveform 1.


      1. A01FDKKE01

        Waveform 1 (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.

    6. Using an oscilloscope, check waveform 2.


      1. A01FFIGE01

        Waveform 2 (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 Engine starts,, LEXUS parking assist-sensor system on, reverse (R) selected

        Tech Tips

        The waveforms for CH1 and CH2 are same.