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Terminals Of Ecu

  1. CHECK PARKING ASSIST ECU 
    Fig 1: Identifying Terminals Of Parking Assist ECU Connector
    G04951829Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the L90 ECU connector.
    2. Measure the resistance and voltage according to the value(s) in the table below.
      PARKING ASSIST ECU (DISCONNECT)

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      L90-1 (IG)-L90-4(GND1) V - Body ground Ignition signal input Engine switch on (IG) 11 to 14 V
      L90-4(GND1)-Body ground W-B - Body ground Ground Always Below 1 Ω
      L90-6 (+B) - L90-4 (GND1) R - Body ground Power source Always 11 to 14 V
      L90-14 (ACC) - L90-4 (GND1) LG - Body ground Accessory Engine switch off Below 1 V
      Engine switch on (ACC) 11 to 14 V
    3. Reconnect the L90 ECU connector.
    4. Measure the resistance, voltage and waveform according to the value(s) in the table below.
      PARKING ASSIST ECU (RECONNECT)

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      L90-8 (CSB3)-L90-27(CSG3) R-V Front side sensor signal Engine switch off Below 1 V
      Engine switch on (IG), clearance sonar main switch OFF → ON 7.2 to 8.8 V
      L90-11 (AUO+)-Body ground R - Body ground Audio signal (output) - 100 kΩ or higher
      L90-12(TX1-)-L90-4 (GND1) B-W-B AVC-LAN communication signal Engine switch on (ACC) 2 to 3 V
      L90-13(TX1+)-L90-4 (GND1) Y-W-B AVC-LAN communication signal Engine switch on (ACC) 2 to 3V
      L90-27 (CSG3)-L90-4 (GND1) V-W-B Ground Always Below 1 Ω
      L90-28 (LIN3)-L90-27 (CSG3) G-V Front side sensor signal Engine switch on (IG), clearance sonar main switch OFF → ON Waveform
      L90-29 (AUGO) Shield Audio small signal ground (shielded) - -
      L90-30 (AUO-) - Body ground G - Body ground Audio signal (output) - 100 kΩ or higher
      L90-31 (TX+) - L90-4 (GND1) Y-W-B AVC-LAN communication signal Engine switch on (ACC) 2 to 3 V
      L90-32 (TX-) - L90-4 (GND1) B-W-B AVC-LAN communication signal Engine switch on (ACC) 2 to 3V
      L91-10 (CV+) - L90-4 (GND1) W-W-B Television camera display signal input Engine switch on (IG), shift lever R position Pulse generation (see WAVEFORM )
      L91-11 (CGND)-L90-4 (GND1) R-W-B Television camera ground Always Below 1 V
      L91-34 (CV-)-L90-4 (GND1) Shield - W-B Television camera ground (shielded) Always Below 1 V
      L91-35 (CB+)-L90-4 (GND1) B-W-B Power source to television camera Engine switch on (IG), shift lever R position 5.8 to 6.5 V
    5. Using an oscilloscope, check the waveform.

      Waveform (Reference) 

      WAVEFORM REFERENCE

      Item Content
      Terminal No. (Symbols) L91-34(CV+)-L91-10(CV-)
      Tool Setting 0.2 V/DIV, 0.2 μsec./DIV.
      Condition Engine switch on (IG), shift lever R position
      Fig 2: Identifying Waveform
      G04945285Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: Pulses as shown in  Fig 2 . 

  2. CHECK TELEVISION CAMERA ASSEMBLY 
    Fig 3: Identifying Television Camera Assembly
    G04951925Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage and resistance according to the value(s) in the table below.
      TELEVISION CAMERA ASSEMBLY VOLTAGE AND RESISTANCE

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      S35-2 (CV+) - S35-1 (CV-) R - Shielded Display signal Engine switch on (IG), shift lever R position Pulse generation (see WAVEFORM )

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

    2. Disconnect the S35 camera connector.
    3. Measure the voltage and waveform according to the value(s) in the table below.
      TELEVISION CAMERA ASSEMBLY (DISCONNECT)

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      S35-3 (CGND) - Body ground W - Body ground Ground Always Below 1 Ω
      S35-4 (CB+) - S35-3 (CGND) B-W Power source Engine switch on (IG), shift lever R position 5.8 to 6.5 V

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

    4. Reconnect the S35 camera connector.
    5. Using an oscilloscope, check the waveform.

      Waveform (Reference) 

      TELEVISION CAMERA ASSEMBLY (RECONNECT)

      Item Content
      Terminal No. (Symbols) S35-2 (CV+) - S35-1 (CV-)
      Tool Setting 0.2 V/DIV., 0.2 μsec./DIV.
      Condition Engine switch on (IG), shift lever R position
      Fig 4: Identifying Waveform
      G04945285Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: Pulses as shown in  Fig 4 . 

  3. CHECK MULTI-DISPLAY  (See TERMINALS OF ECU )
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