LEXUS PARKING ASSIST-SENSOR SYSTEM TERMINALS OF ECU


  1. CHECK CLEARANCE WARNING ECU (w/o Parking Assist Monitor System)

    A01NDIDE10

    1. Disconnect the F52 connector from the ECU.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      F52-15 (IG) - F52-17 (E) W - W-B IG power source signal Power switch off Below 1.5 V
      Power switch on (IG) 11 to 14 V
      F52-17 (E) - Body ground W-B - Body ground Ground Always Below 1 Ω

    3. Reconnect the F52 connector to the ECU.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      F52-7 (BOR) - F52-17 (E) B - W-B Power source for rear sensor circuit Power switch off Below 1.5 V
      Power switch on (IG), Lexus parking assist-sensor system on 7.2 to 8.8 V
      F52-9 (SOF) - F52-17 (E) SB - W-B Front sensor communication signal (Front clearance sonar sensor) Power switch on (IG), Lexus parking assist-sensor system on, shift lever in R

      Pulse generation

      (See waveform 2)
      F52-10 (BBZ) - F52-17 (E) W - W-B Clearance warning buzzer signal Power switch off Below 1.5 V
      Power switch on (IG), Lexus parking assist-sensor system on 11 to 14 V
      F52-11 (EF) - F52-17 (E) Y - W-B Ground for clearance warning buzzer Buzzer sounding

      Pulse generation

      (See waveform 1)
      F52-18 (E2) - F52-17 (E) R - W-B Ground for rear clearance sonar Always Below 1 Ω
      F52-19 (E1) - F52-17 (E) R - W-B Ground for rear clearance sonar Always Below 1 Ω
      F52-21 (BOF) - F52-17 (E) B - W-B Power source for front sensor circuit Power switch off Below 1.5 V
      Power switch on (IG), Lexus parking assist-sensor system on 7.2 to 8.8 V
      F52-24 (SOR) - F52-17 (E) G - W-B Rear sensor communication signal (Rear clearance sonar sensor) Power switch on (IG), Lexus parking assist-sensor system on, shift lever in R

      Pulse generation

      (See waveform 2)

    5. Using an oscilloscope, check waveform 1.


      1. A01NHUQE01

        Waveform 1 (Reference)

        Item Content
        Terminal No. (Symbol) F52-11 (EF) - F52-17 (E)
        Tool Setting 2 V/DIV., 500 μsec./DIV.
        Vehicle Condition When sonar detects obstacle (buzzer sounds)

    6. Using an oscilloscope, check waveform 2.


      1. A01NGD1E01

        Waveform 2 (Reference)

        Item Content
        Terminal No. (Symbol)

        • CH: 1 F52-9 (SOF) - F52-17 (E)

        • CH: 2 F52-24 (SOR) - F52-17 (E)
        Tool Setting 5 V/DIV., 1 msec./DIV.
        Condition Power switch on (IG), Lexus parking assist-sensor system on, shift lever in R

  2. PARKING ASSIST ECU (w/ Parking Assist Monitor System)

    A01NETIE04

    1. Disconnect the F54 connector from the ECU.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      F54-1 (+B) - F54-3 (GND1) R - W-B Power source signal Power switch off 11 to 14 V
      F54-3 (GND1) - Body ground W-B - Body ground Ground Always Below 1 Ω
      F54-7 (IG) - F54-3 (GND1) W - W-B IG power source signal Power switch on (IG) 11 to 14 V
      F54-8 (ACC) - F54-3 (GND1) GR - W-B ACC power source signal Power switch on (ACC) 11 to 14 V

    3. Reconnect the F54 connector to the ECU.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      F55-1 (CSB1) - F54-3 (GND1) B - W-B Power source for front sensor circuit Power switch off Below 1.5 V
      Power switch on (IG), Lexus parking assist-sensor system on 7.2 to 8.8 V
      F55-2 (CSG1) - F54-3 (GND1) R - W-B Ground for front clearance sonar sensor Always Below 1 Ω
      F55-3 (LIN1) - F54-3 (GND1) SB - W-B Front sensor communication signal (Front clearance sonar sensor) Power switch on (IG), Lexus parking assist-sensor system on, shift lever in R

      Pulse generation

      (See waveform 1)
      F55-7 (CSB2) - F54-3 (GND1) B - W-B Power source for rear sensor circuit Power switch off Below 1.5 V
      Power switch on (IG), Lexus parking assist-sensor system on 7.2 to 8.8 V
      F55-8 (CSG2) - F54-3 (GND1) R - W-B Ground for front clearance sonar sensor Always Below 1 Ω
      F55-9 (LIN2) - F54-3 (GND1) G - W-B Rear sensor communication signal (Rear clearance sonar sensor) Power switch on (IG), Lexus parking assist-sensor system on, shift lever in R

      Pulse generation

      (See waveform 1)
      F54-17 (EF) - F54-3 (GND1) Y - W-B Ground for clearance warning buzzer Buzzer sounding

      Pulse generation

      (See waveform 2)
      F54-18 (BBZ) - F54-3 (GND1) W - W-B Clearance warning buzzer signal Power switch off Below 1.5 V
      Power switch on (IG), Lexus parking assist-sensor system on 11 to 14 V

    5. Using an oscilloscope, check waveform 1.


      1. A01NGD1E01

        Waveform 2 (Reference)

        Item Content
        Terminal No. (Symbol)

        • CH: 1 F55-3 (LIN1) - F54-3 (GND1)

        • CH: 2 F55-9 (LIN2) - F54-3 (GND1)
        Tool Setting 5 V/DIV., 1 msec./DIV.
        Condition Power switch on (IG), Lexus parking assist-sensor system on, shift lever in R

    6. Using an oscilloscope, check waveform 2.


      1. A01NHUQE01

        Waveform 1 (Reference)

        Item Content
        Terminal No. (Symbol) F54-17 (EF) - F54-3 (GND1)
        Tool Setting 2 V/DIV., 500 μsec./DIV.
        Vehicle Condition When sonar detects obstacle (buzzer sounds)