LEXUS PARKING ASSIST-SENSOR SYSTEM TERMINALS OF ECU


  1. CLEARANCE WARNING ECU ASSEMBLY

    B000XMSN32

    1. Disconnect the X12 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
      X12-12 (IG) - X12-27 (E) R - W-B IG power source signal Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      X12-27 (E) - Body ground W-B - Body ground Ground Always Below 1 Ω

    3. Reconnect the X12 clearance warning ECU assembly connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      X12-1 (S1) - X12-2 (E1) B - W Sensor communication signal (Rear right sensor) Engine running, LEXUS parking assist-sensor system on, shift position in R

      Pulse generation

      (See waveform 2)
      X12-2 (E1) - X12-27 (E) W - W-B Ground for sensor (Rear right sensor) Always Below 1 Ω
      X12-3 (S2) - X12-4 (E2) BE - R Sensor communication signal (Rear left sensor) Engine running, LEXUS parking assist-sensor system on, shift position in R

      Pulse generation

      (See waveform 2)
      X12-4 (E2) - X12-27 (E) R - W-B Ground for sensor (Rear left sensor) Always Below 1 Ω
      X12-6 (S3) - X12-7 (E3) SB - LG Sensor communication signal (Rear right center sensor) Engine running, LEXUS parking assist-sensor system on, shift position in R

      Pulse generation

      (See waveform 2)
      X12-7 (E3) - X12-27 (E) LG - W-B Ground for sensor (Rear right center sensor) Always Below 1 Ω
      X12-8 (S4) - X12-9 (E4) V - L Sensor communication signal (Rear left center sensor) Engine running, LEXUS parking assist-sensor system on, shift position in R

      Pulse generation

      (See waveform 2)
      X12-9 (E4) - X12-27 (E) L - W-B Ground for sensor (Rear left center sensor) Always Below 1 Ω
      X12-11 (CBZ) - X12-10 (EF) LG - W Clearance warning buzzer signal Buzzer sounding

      Pulse generation

      (See waveform 1)
      X12-17 (R1) P CAN communication signal - -
      X12-18 (R2) L CAN communication signal - -
      X12-19 (S5) - X12-20 (E5) R - LG Sensor communication signal (Front right sensor) Engine running, LEXUS parking assist-sensor system on, shift position in R

      Pulse generation

      (See waveform 2)

      Engine running, LEXUS parking assist-sensor system on, shift position in any position other than P or R


      • Less than approximately 15 km/h (9.3 mph) if vehicle speed is increasing

      • Less than approximately 10 km/h (6.2 mph) if vehicle speed is decreasing
      X12-20 (E5) - X12-27 (E) LG - W-B Ground for sensor (Front right sensor) Always Below 1 Ω
      X12-21 (S6) - X12-22 (E6) V - B Sensor communication signal (Front left sensor) Engine running, LEXUS parking assist-sensor system on, shift position in R

      Pulse generation

      (See waveform 2)

      Engine running, LEXUS parking assist-sensor system on, shift position in any position other than P or R


      • Less than approximately 15 km/h (9.3 mph) if vehicle speed is increasing

      • Less than approximately 10 km/h (6.2 mph) if vehicle speed is decreasing
      X12-22 (E6) - X12-27 (E) B - W-B Ground for sensor (Front left sensor) Always Below 1 Ω
      X12-23 (S7) - X12-24 (E7) W - G Sensor communication signal (Front right center sensor)

      Engine running, LEXUS parking assist-sensor system on, shift position in any position other than P or R


      • Less than approximately 15 km/h (9.3 mph) if vehicle speed is increasing

      • Less than approximately 10 km/h (6.2 mph) if vehicle speed is decreasing

      Pulse generation

      (See waveform 2)
      X12-24 (E7) - X12-27 (E) G - W-B Ground for sensor (Front right center sensor) Always Below 1 Ω
      X12-25 (S8) - X12-26 (E8) GR - P Sensor communication signal (Front left center sensor)

      Engine running, LEXUS parking assist-sensor system on, shift position in any position other than P or R


      • Less than approximately 15 km/h (9.3 mph) if vehicle speed is increasing

      • Less than approximately 10 km/h (6.2 mph) if vehicle speed is decreasing

      Pulse generation

      (See waveform 2)
      X12-26 (E8) - X12-27 (E) P - W-B Ground for sensor (Front left center sensor) Always Below 1 Ω

    5. Using an oscilloscope, check waveform 1.


      1. B000UPW

        Waveform 1 (Reference)

        Item Content
        Terminal No. (Symbol) X12-11 (CBZ) - X12-10 (EF)
        Tool Setting 2 V/DIV., 100 μsec./DIV.
        Condition Buzzer sounding

        Tech Tips

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

    6. Using an oscilloscope, check waveform 2.


      1. B000WH6E01

        Waveform 2 (Reference)

        Item Content
        Terminal No. (Symbol)

        X12-1 (S1) - X12-2 (E1)

        X12-3 (S2) - X12-4 (E2)

        X12-6 (S3) - X12-7 (E3)

        X12-8 (S4) - X12-9 (E4)
        Tool Setting 2 V/DIV., 100 μsec./DIV.
        Condition Engine running, LEXUS parking assist-sensor system on, shift position in R
        Item Content
        Terminal No. (Symbol)

        X12-19 (S5) - X12-20 (E5)

        X12-21 (S6) - X12-22 (E6)
        Tool Setting 2 V/DIV., 100 μsec./DIV.
        Condition Engine running, LEXUS parking assist-sensor system on, shift position in R

        Engine running, LEXUS parking assist-sensor system on, shift position in any position other than P or R


        • Less than approximately 15 km/h (9.3 mph) if vehicle speed is increasing

        • Less than approximately 10 km/h (6.2 mph) if vehicle speed is decreasing
        Item Content
        Terminal No. (Symbol)

        X12-23 (S7) - X12-24 (E7)

        X12-25 (S8) - X12-26 (E8)
        Tool Setting 2 V/DIV., 100 μsec./DIV.
        Condition

        Engine running, LEXUS parking assist-sensor system on, shift position in any position other than P or R


        • Less than approximately 15 km/h (9.3 mph) if vehicle speed is increasing

        • Less than approximately 10 km/h (6.2 mph) if vehicle speed is decreasing