TOYOTA PARKING ASSIST-SENSOR SYSTEM TERMINALS OF ECU


  1. CLEARANCE WARNING ECU ASSEMBLY

    B000INCE02

    1. Disconnect the I82 connector from the clearance warning ECU assembly.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      I82-9 (CLSW) - I82-30 (E) B - BR Back sonar or clearance sonar switch assembly power source signal Ignition switch ON, clearance sonar main switch on 11 to 14 V
      I82-9 (CLSW) - I82-30 (E) B - BR Back sonar or clearance sonar switch assembly power source signal Ignition switch ON, clearance sonar main switch off Below 1 V
      I82-1 (IG) - I82-30 (E) Y - BR IG power source signal Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      I82-30 (E) - Body ground BR - Body ground Ground Always Below 1 Ω

    3. Reconnect the I82 connector to the clearance warning ECU assembly.

    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
      I82-22 (BOR) - I82-30 (E) V - BR Power source for rear sensor circuit Ignition switch off Below 1 V
      Ignition switch ON, clearance sonar main switch on 7.2 to 8.8 V
      I82-8 (SOF) - I82-30 (E) P - BR Front sensor communication signal (Front clearance sonar sensor) Ignition switch ON, clearance sonar main switch on, shift lever in R

      Pulse generation

      (See waveform 2)
      I82-13 (ER) - I82-30 (E) R - BR Clearance warning buzzer signal Buzzer sounding

      Pulse generation

      (See waveform 1)
      I82-23 (E1) - I82-30 (E) GR - BR Ground for rear clearance sonar Always Below 1 V
      I82-6 (E5) - I82-30 (E) W - BR Ground for front clearance sonar Always Below 1 V
      I82-4 (BOF) - I82-30 (E) R - BR Power source for front sensor circuit Ignition switch off Below 1 V
      Ignition switch ON, clearance sonar main switch on 7.2 to 8.8 V
      I82-24 (SOR) - I82-30 (E) L - BR Rear sensor communication signal (Rear clearance sonar sensor) Ignition switch ON, clearance sonar main switch on, shift lever in R

      Pulse generation

      (See waveform 2)

    5. Using an oscilloscope, check waveform 1.


      1. B000LZHE01

        Waveform 1 (Reference)

        Item Content
        Terminal No. (Symbol) I82-13 (ER) - I82-30 (E)
        Tool Setting 2 V/DIV., 500 μsec./DIV.
        Vehicle Condition When sonar detects obstacle (buzzer sounds)
        Buzzer volume M2 (Medium volume)

        Tech Tips

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

    6. Using an oscilloscope, check waveform 2.


      1. B000MOJE01

        Waveform 2 (Reference)

        Item Content
        Terminal No. (Symbol)

        • CH: 1 I82-8 (SOF) - I82-30 (E)

        • CH: 2 I82-24 (SOR) - I82-30 (E)
        Tool Setting 5 V/DIV., 1 msec./DIV.
        Condition Ignition switch ON, clearance sonar main switch on, shift lever in R

        Tech Tips

        The waveforms for CH1 and CH2 are same.