LEXUS PARKING ASSIST-SENSOR SYSTEM TERMINALS OF ECU


  1. CLEARANCE WARNING ECU ASSEMBLY

    A01QBX0E14

    1. Disconnect the K9 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
      K9-12 (IG) - K9-27 (E) Y - W-B IG power source signal Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      K9-27 (E) - Body ground W-B - Body ground Ground Always Below 1 Ω
      K9-38 (CLSW) - K9-27 (E) GR - W-B Back sonar or clearance sonar switch assembly power source signal

      • Engine switch on (IG)

      • Back sonar or clearance sonar switch assembly off

      		 Below 1 V

      • Engine switch on (IG)

      • Back sonar or clearance sonar switch assembly on

      		 11 to 14 V

    3. Reconnect the K9 clearance warning ECU assembly connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      K9-1 (S1) - K9-2 (E1) G - SB Sensor communication signal (Rear right sensor)

      • Engine switch on (IG)

      • Back sonar or clearance sonar switch assembly on

      • Shift lever in R

      Pulse generation

      (See waveform 1)
      K9-2 (E1) - K9-27 (E) SB - W-B Ground for sensor (Rear right sensor) Always Below 1 V
      K9-3 (S2) - K9-4 (E2) LG - L Sensor communication signal (Rear left sensor)

      • Engine switch on (IG)

      • Back sonar or clearance sonar switch assembly on

      • Shift lever in R

      Pulse generation

      (See waveform 1)
      K9-4 (E2) - K9-27 (E) L - W-B Ground for sensor (Rear left sensor) Always Below 1 V
      K9-6 (S3) - K9-7 (E3) W - V Sensor communication signal (Rear right center sensor)

      • Engine switch on (IG)

      • Back sonar or clearance sonar switch assembly on

      • Shift lever in R

      Pulse generation

      (See waveform 1)
      K9-7 (E3) - K9-27 (E) V - W-B Ground for sensor (Rear right center sensor) Always Below 1 V
      K9-8 (S4) - K9-9 (E4) B - G Sensor communication signal (Rear left center sensor)

      • Engine switch on (IG)

      • Back sonar or clearance sonar switch assembly on

      • Shift lever in R

      Pulse generation

      (See waveform 1)
      K9-9 (E4) - K9-27 (E) G - W-B Ground for sensor (Rear left center sensor) Always Below 1 V
      K9-11 (CBZ) - K9-10 (EF) B - W Clearance warning buzzer signal Buzzer sounding

      Pulse generation

      (See waveform 2)
      K9-19 (S5) - K9-20 (E5) B - W Sensor communication signal (Front right sensor)

      • Engine switch on (IG)

      • Back sonar or clearance sonar switch assembly on

      • Shift lever in R

      Pulse generation

      (See waveform 1)

      • Engine switch on (IG)

      • Back sonar or clearance sonar switch assembly on

      • Shift lever in any position other than P or R

      • Less than approximately 15 km/h (9 mph) if vehicle speed increasing

      • Less than approximately 10 km/h (6 mph) if vehicle speed decreasing
      K9-20 (E5) - K9-27 (E) W - W-B Ground for sensor (Front right sensor) Always Below 1 V
      K9-21 (S6) - K9-22 (E6) L - Y Sensor communication signal (Front left sensor)

      • Engine switch on (IG)

      • Back sonar or clearance sonar switch assembly on

      • Shift lever in R

      Pulse generation

      (See waveform 1)

      • Engine switch on (IG)

      • Back sonar or clearance sonar switch assembly on

      • Shift lever in any position other than P or R

      • Less than approximately 15 km/h (9 mph) if vehicle speed increasing

      • Less than approximately 10 km/h (6 mph) if vehicle speed decreasing
      K9-22 (E6) - K9-27 (E) Y - W-B Ground for sensor (Front left sensor) Always Below 1 V

    5. Using an oscilloscope, check waveform 1.


      1. A01QAAHE01

        Waveform 1 (Reference)

        Item Content
        Terminal No. (Symbol)

        K9-1 (S1) - K9-2 (E1)

        K9-3 (S2) - K9-4 (E2)

        K9-6 (S3) - K9-7 (E3)

        K9-8 (S4) - K9-9 (E4)
        Tool Setting 2 V/DIV., 100 μs./DIV.
        Condition

        • Engine switch on (IG)

        • Back sonar or clearance sonar switch assembly on

        • Shift lever in R
        Item Content
        Terminal No. (Symbol)

        K9-19 (S5) - K9-20 (E5)

        K9-21 (S6) - K9-22 (E6)
        Tool Setting 2 V/DIV., 100 μs./DIV.
        Condition

        • Engine switch on (IG)

        • Back sonar or clearance sonar switch assembly on

        • Shift lever in R

        • Engine switch on (IG)

        • Back sonar or clearance sonar switch assembly on

        • Shift lever in any position other than P or R

        • Less than approximately 15 km/h (9 mph) if vehicle speed increasing

        • Less than approximately 10 km/h (6 mph) if vehicle speed decreasing

    6. Using an oscilloscope, check waveform 2.


      1. A01QCMBN03

        Waveform 2 (Reference)

        Item Content
        Terminal No. (Symbol) K9-11 (CBZ) - K9-10 (EF)
        Tool Setting 2 V/DIV., 100 μs./DIV.
        Condition Buzzer sounding

        Tech Tips

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