LEXUS PARKING ASSIST-SENSOR SYSTEM (w/ Side Monitor System) TERMINALS OF ECU


  1. PARKING ASSIST ECU

    A019KV3E06

    1. Disconnect the F103 and F104 parking assist ECU connectors.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      F103-1 (+B) - F103-4 (GND1) R - W-B Power source signal Always 11 to 14 V
      F103-4 (GND1) - Body ground W-B - Body ground Ground Always Below 1 Ω
      F103-8 (IG) - F103-4 (GND1) W - W-B IG Power source signal Engine switch on (IG) 11 to 14 V
      F103-9 (ACC) - F103-4 (GND1) GR - W-B ACC Power source signal Engine switch on (ACC) 11 to 14 V

    3. Reconnect the F103 and F104 parking assist ECU connectors.

    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
      F104-20 (CSB2) - F103-4 (GND1) B - W-B Power source for rear sensor circuit Engine switch off Below 1 V
      Engine switch on (IG), LEXUS parking assist-sensor system on 7.2 to 8.8 V
      F104-23 (LIN1) - F103-4 (GND1) SB - W-B Front sensor communication signal (Front clearance sonar sensor) Engine switch on (IG), LEXUS parking assist-sensor system on, shift lever in R

      Pulse generation

      (See waveform 2)
      F103-7 (BBZ) - F103-4 (GND1) W - W-B Clearance warning buzzer signal Engine switch off Below 1 V
      Engine switch on (IG), LEXUS parking assist-sensor system on 11 to 14 V
      F103-6 (EF) - F103-4 (GND1) Y - W-B Ground for clearance warning buzzer Buzzer sounding

      Pulse generation

      (See waveform 1)
      F104-4 (CSG2) - F103-4 (GND1) R - W-B Ground for rear clearance sonar Always Below 1 Ω
      F104-6 (CSG1) - F103-4 (GND1) R - W-B Ground for front clearance sonar Always Below 1 Ω
      F104-5 (CSB1) - F103-4 (GND1) B - W-B Power source for front sensor circuit Engine switch off Below 1 V
      Engine switch on (IG), LEXUS parking assist-sensor system on 7.2 to 8.8 V
      F104-3 (LIN2) - F103-4 (GND1) G - W-B Rear sensor communication signal (Rear clearance sonar sensor) Engine 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. A019LFRE01

        Waveform 1 (Reference)

        Item Content
        Terminal No. (Symbol) F103-6 (EF) - F103-4 (GND1)
        Tool Setting 2 V/DIV., 500 μsec./DIV.
        Vehicle Condition When sonar detects obstacle (buzzer sounds)

    6. Using an oscilloscope, check waveform 2.


      1. A019L5TE01

        Waveform 2 (Reference)

        Item Content
        Terminal No. (Symbol)

        • CH: 1 F104-23 (LIN1) - F103-4 (GND1)

        • CH: 2 F104-3 (LIN2) - F103-4 (GND1)
        Tool Setting 5 V/DIV., 1 msec./DIV.
        Condition Engine switch on (IG), LEXUS parking assist-sensor system on, shift lever in R