TOYOTA PARKING ASSIST-SENSOR SYSTEM TERMINALS OF ECU


  1. CLEARANCE WARNING ECU ASSEMBLY

    B003NTUN05

    1. Disconnect the G88 clearance warning ECU assembly connector.

    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
      G88-11 (IG) - Body ground R - Body ground IG power source signal

      • Ignition switch to ON

      • Back sonar or clearance sonar switch assembly off

      		 Below 1 V

      • Ignition switch to ON

      • Back sonar or clearance sonar switch assembly on

      		 11 to 14 V
      G88-16 (E) - Body ground BR - Body ground Ground Always Below 1 Ω
      G88-21 (RL) - Body ground R - Body ground Reverse position signal

      • Ignition switch to ON

      • Shift lever in any position other than R

      		 Below 1 V

      • Ignition switch to ON

      • Shift lever in R

      		 11 to 14 V

    3. Reconnect the G88 clearance warning ECU assembly connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      G88-2 (ER) - Body ground B - Body ground Clearance warning buzzer signal When sonar detects obstacle (buzzer sounds)

      Pulse generation

      (See waveform 1)
      G88-1 (BBZ) - Body ground W - Body ground Power source of clearance warning buzzer

      • Ignition switch to ON

      • Back sonar or clearance sonar switch assembly on

      		 11 to 14 V
      G88-12 (BOR) - Body ground V - Body ground Power source for rear center sensor circuit Ignition switch off. Below 1 V

      • Ignition switch to ON

      • Back sonar or clearance sonar switch assembly on

      		 7.2 to 8.8 V
      G88-13 (E1) - Body ground L - Body ground Ground for sensor (Rear center sensor) Always Below 1 Ω
      G88-14 (SOR) - Body ground G - Body ground Sensor communication signal (Rear center sensor)

      • Ignition switch to ON

      • Back sonar or clearance sonar switch assembly on

      • Shift lever in R

      Pulse generation

      (See waveform 2)

    5. Using an oscilloscope, check waveform.


      1. B003PTKN01

        Waveform 1 (Reference)

        Item Content
        Terminal No. (Symbol) G88-2 (ER) - Body ground
        Tool Setting 2 V/DIV., 200 μsec./DIV.
        Vehicle Condition When sonar detects obstacle (buzzer sounds)
      2. B003S3TN01

        Waveform 2 (Reference)

        Item Content
        Terminal No. (Symbol) G88-14 (SOR) - Body ground
        Tool Setting 5 V/DIV., 1 msec./DIV.
        Condition

        • Ignition switch to ON

        • Back sonar or clearance sonar switch assembly on

        • Shift lever in R