TOYOTA PARKING ASSIST-SENSOR SYSTEM TERMINALS OF ECU


  1. CHECK CLEARANCE WARNING ECU

    A01J507E09

    1. Disconnect the C25 ECU connector.

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

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      C25-10 (IG) - Body ground L-R - Body ground IG power source circuit Ignition switch ON, clearance sonar main switch on 11 to 14 V
      C25-10 (IG) - Body ground L-R - Body ground IG power source circuit Ignition switch ON, clearance sonar main switch off Below 1 V
      C25-21 (E) - Body ground W-B - Body ground Body ground Always Below 1 Ω

      If the result is not as specified, there may be a malfunction on the wire harness side.

    3. Reconnect the C25 ECU connector.

    4. Measure the voltage according to the value(s) in the table below.

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      C25-13 (RL) - Body ground R-W - Body ground Reverse position signal Ignition switch ON, shift lever moved to R 7 V or higher
      C25-13 (RL) - Body ground R-W - Body ground Reverse position signal Ignition switch ON, shift lever moved to any position except R Below 1 V
      C25-12 (BBZ) - Body ground P-G - Body ground No. 1 clearance warning buzzer signal Sonar detects obstacle (buzzer sounds) Waveform 1
      C25-3 (SPD) - Body ground V-R - Body ground Vehicle speed signal Vehicle driven at approximately 20 km/h (12 mph) Waveform 2
      C25-22 (E2) - Body ground L - Body ground No. 1 ultrasonic sensor ground Always Below 1 V
      C25-24 (BOR) - C25-22 (E2) BR - L No. 1 ultrasonic sensor power source circuit Ignition switch ON, clearance sonar main switch on 7.2 to 8.8 V
      C25-24 (BOR) - C25-22 (E2) BR - L No. 1 ultrasonic sensor power source circuit Ignition switch off Below 1.5 V
      C25-6 (SOR) - C25-22 (E2) P - L No. 1 ultrasonic sensor communication signal Ignition switch ON, clearance sonar main switch on Waveform 3

      If the result is not as specified, the ECU may have a malfunction.


      1. A01J5QCE01

        Using an oscilloscope, check waveform 1.

        Measurement Condition
        Item Content
        Terminal No. (Symbols) C25-12 (BBZ) - Body ground
        Tool Setting 5 V/DIV., 1 msec./DIV.
        Condition Sonar detects obstacle (buzzer sounds)
      2. A01J3A6E01

        Using an oscilloscope, check waveform 2.

        Measurement Condition
        Item Content
        Terminal No. (Symbols) C25-3 (SPD) - Body ground
        Tool Setting 5 V/DIV., 10 msec./DIV.
        Condition Vehicle driven at approximately 20 km/h (12.4 mph)
      3. A01J6H4E01

        Using an oscilloscope, check waveform 3.

        Measurement Condition
        Item Content
        Terminal No. (Symbols) C25-6 (SOR) - C25-22 (E2)
        Tool Setting 2 V/DIV., 200 μsec./DIV.
        Condition Ignition switch ON, clearance sonar main switch on