Toyota Parking Assist-Sensor System Terminals Of Ecu

Body Electrical. Camry. Acv40 Gsv40
Park Assist Monitoring. Camry. Acv40 Gsv40

  1. CHECK CLEARANCE WARNING ECU

Toyota Parking Assist-Sensor System -- Terminals Of Ecu



CHECK CLEARANCE WARNING ECU


  1. Disconnect the O28 ECU connector.


    Camry. Acv40 Gsv40.Park Assist Monitoring.Toyota Parking Assist-Sensor System.Toyota Parking Assist-Sensor System Terminals Of Ecu

  2. Measure the resistance and voltage between each terminal of the wire harness side connector.

    Terminal No. (Symbols)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    O28-12 (CLSW) - O28-17 (E)
    		B - W-B
    		Clearance sonar main switch signal
    		Ignition switch off
    		Below 1 V
    Ignition switch ON, clearance sonar main switch ON
    		11 to 14 V
    O28-15 (IG) - O28-17 (E)
    		R - W-B
    		IG signal / IG power source signal
    		Ignition switch off
    		Below 1 V
    Ignition switch ON
    		11 to 14 V
    O28-17 (E) - Body ground
    		W-B - Body ground
    		ECU 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 O28 ECU connector.

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

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    O28-7 (BOR) - O28-17 (E)
    		V - W-B
    		Rear sensor circuit power source
    		Ignition switch off
    		Below 1 V
    Ignition switch ON
    Clearance sonar main switch on
    		7.2 to 8.8 V
    O28-9 (SOF) - O28-17 (E)
    		BR - W-B
    		Front sensor communication signal
    		Ignition switch ON
    Clearance sonar main switch on
    Shift lever in R
    		Waveform 2
    O28-10 (BBZ) - O28-17 (E)
    		R - W-B
    		Clearance warning buzzer signal
    		Ignition switch off
    		Below 1 V
    Ignition switch ON
    Clearance sonar main switch on
    		11 to 14 V
    O28-11 (EF) - O28-17 (E)
    		O - W-B
    		Ground for clearance warning buzzer
    		Buzzer sounding
    		Waveform 1
    O28-19 (E1) - O28-17 (E)
    		L - W-B
    		Front sensor circuit ground
    		Always
    		Below 1 Ω
    O28-18 (E2) - O28-17 (E)
    		G - W-B
    		Rear sensor circuit ground
    		Always
    		Below 1 Ω
    O28-21 (BOF) - O28-17 (E)
    		W - W-B
    		Front sensor circuit power source
    		Ignition switch off
    		Below 1 V
    Ignition switch ON
    Clearance sonar main switch on
    		7.2 to 8.8 V
    O28-24 (SOR) - O28-17 (E)
    		R - W-B
    		Rear sensor communication signal
    		Ignition switch ON
    Clearance sonar main switch on
    Shift lever in R
    		Waveform 2
    If the result is not as specified, the ECU may have a malfunction.


  5. Using an oscilloscope, check waveform 1.



      Camry. Acv40 Gsv40.Park Assist Monitoring.Toyota Parking Assist-Sensor System.Toyota Parking Assist-Sensor System Terminals Of Ecu

    1. Waveform 1 (Reference)

      Item
      		Content
      Terminal No. (Symbols)
      		O28-11 (EF) - O28-17 (E)
      Tool Setting
      		2 V/DIV., 500 μsec./DIV.
      Vehicle Condition
      		When sonar detects obstacle (buzzer sounds)


  6. Using an oscilloscope, check waveform 2.



      Camry. Acv40 Gsv40.Park Assist Monitoring.Toyota Parking Assist-Sensor System.Toyota Parking Assist-Sensor System Terminals Of Ecu

    1. Waveform 2 (Reference)

      Item
      		Content
      Terminal No. (Symbols)
      1. CH: 1 O28-9 (SOF) - O28-17 (E)
      2. CH: 2 O28-24 (SOR) - O28-17 (E)
      Tool Setting
      		5 V/DIV., 1 msec./DIV.
      Condition
      		Ignition switch ON, clearance sonar main switch on, shift lever in R