TOYOTA PARKING ASSIST-SENSOR SYSTEM(for 6 Sensor Type) TERMINALS OF ECU


  1. CLEARANCE WARNING ECU ASSEMBLY

    A0027EBN14

    1. Disconnect the F87 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
      F87-12 (IG) - F87-27 (E) R - W-B IG power source signal Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      F87-27 (E) - Body ground W-B - Body ground Ground Always Below 1 Ω
      F87-38 (CLSW) - F87-27 (E) GR - W-B Back sonar or clearance sonar switch assembly power source signal

      • Ignition switch ON

      • Back sonar or clearance sonar switch assembly off

      		 Below 1 V

      • Ignition switch ON

      • Back sonar or clearance sonar switch assembly on

      		 11 to 14 V

    3. Reconnect the F87 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
      F87-1 (S1) - F87-2 (E1) B - W Sensor communication signal (Rear right sensor)

      • Ignition switch ON

      • Back sonar or clearance sonar switch assembly on

      • Shift lever in R

      Pulse generation

      (See waveform 1)
      F87-2 (E1) - F87-27 (E) W - W-B Ground for sensor (Rear right sensor) Always Below 1 V
      F87-3 (S2) - F87-2 (E1) G - W Sensor communication signal (Rear left sensor)

      • Ignition switch ON

      • Back sonar or clearance sonar switch assembly on

      • Shift lever in R

      Pulse generation

      (See waveform 1)
      F87-6 (S3) - F87-2 (E1) R - W Sensor communication signal (Rear right center sensor)

      • Ignition switch ON

      • Back sonar or clearance sonar switch assembly on

      • Shift lever in R

      Pulse generation

      (See waveform 1)
      F87-8 (S4) - F87-2 (E1) Y - W Sensor communication signal (Rear left center sensor)

      • Ignition switch ON

      • Back sonar or clearance sonar switch assembly on

      • Shift lever in R

      Pulse generation

      (See waveform 1)
      F87-11 (CBZ) - F87-10 (EF) SB - LG Clearance warning buzzer signal Buzzer sounding

      Pulse generation

      (See waveform 2)
      F87-19 (S5) - F87-20 (E5) LG - SB Sensor communication signal (Front right sensor)

      • Ignition switch ON

      • Back sonar or clearance sonar switch assembly on

      • Shift lever in R

      Pulse generation

      (See waveform 1)

      • Ignition switch ON

      • Back sonar or clearance sonar switch assembly on

      • Shift lever in any position other than P or R

      • Less than approximately 10 km/h (6 mph)
      F87-20 (E5) - F87-27 (E) SB - W-B Ground for sensor (Front right sensor) Always Below 1 V
      F87-21 (S6) - F87-22 (E6) GR - SB Sensor communication signal (Front left sensor)

      • Ignition switch ON

      • Back sonar or clearance sonar switch assembly on

      • Shift lever in R

      Pulse generation

      (See waveform 1)

      • Ignition switch ON

      • Back sonar or clearance sonar switch assembly on

      • Shift lever in any position other than P or R

      • Less than approximately 10 km/h (6 mph)
      F87-22 (E6) - F87-27 (E) SB - W-B Ground for sensor (Front left sensor) Always Below 1 V

    5. Using an oscilloscope, check waveform 1.


      1. A002AARE01

        Waveform 1 (Reference)

        Item Content
        Terminal No. (Symbol)

        F87-19 (S5) - F87-20 (E5)

        F87-21 (S6) - F87-22 (E6)
        Tool Setting 2 V/DIV., 100 μs./DIV.
        Condition

        • Ignition switch ON

        • Back sonar or clearance sonar switch assembly on

        • Shift lever in R

        • Ignition switch ON

        • Back sonar or clearance sonar switch assembly on

        • Shift lever in any position other than P or R

        • Less than approximately 10 km/h (6 mph)
        Item Content
        Terminal No. (Symbol)

        F87-1 (S1) - F87-2 (E1)

        F87-3 (S2) - F87-2 (E1)

        F87-6 (S3) - F87-2 (E1)

        F87-8 (S4) - F87-2 (E1)
        Tool Setting 2 V/DIV., 100 μsec./DIV.
        Condition

        • Ignition switch ON

        • Back sonar or clearance sonar switch assembly on

        • Shift lever in R

    6. Using an oscilloscope, check waveform 2.


      1. A002BW3N03

        Waveform 2 (Reference)

        Item Content
        Terminal No. (Symbol) F87-11 (CBZ) - F87-10 (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.