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Terminals Of Ecu

  1. PARKING ASSIST ECU 
    Fig 1: Parking Assist ECU Connector Terminal Identification
    GTY285651Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the F36 connector from the ECU.
    2. Measure the resistance and voltage of each terminal of the wire harness side connector.
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      F36-6 (+B) - F36-4 (GND1) L - W-B Power source signal Always 11 to 14 V
      F36-4 (GND1) - Body ground W-B - Body ground Ground Always Below 1 Ω
      F36-1 (IG) - F36-4 (GND1) G - W-B IG Power source signal Engine switch on (IG) 11 to 14 V
      F36-14 (ACC) - F36-4 (GND1) GR - W-B ACC Power source signal Engine switch off (ACC) 11 to 14 V

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

    3. Reconnect the F36 connector to the ECU.
    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
      F36-10 (CANL) - F36-4 (GND1) L - W-B CAN communication signal CAN communication circuit Pulse generation
      F36-9 (CANH) - F36-4 (GND1) V - W-B CAN communication signal CAN communication circuit Pulse generation
      F37-22 (BLSW) - F36-4 (GND1) G - W-B Front and side monitor main switch signal Engine switch on (IG)
      Front and side monitor main switch pushed in      		 11 to 14 V
      Engine switch on (IG)
      Front and side monitor main switch not pushed in      		 Below 1 V
      F36-32 (TX-) - F36-31 (TX+) L - W AVC-LAN communication signal - -
      F37-15 (BCV-) - F36-4 (GND1) W - W-B Front television camera ground Always Below 1 V
      F37-37 (BCV+) - F36-4 (GND1) R - W-B Front television camera display signal (NTSC) input Engine switch on (IG)
      Front and side monitor main switch on
      Under normal conditions      		 Pulse generation
      (See waveform 1 in  1)
      Engine switch on (IG)
      Front and side monitor main switch on
      Camera lens is covered, blacking out the screen      		 Pulse generation
      (See waveform 2 in  2)
      F37-38 (BGND) - F36-4 (GND1) Shielded - W-B Front television camera ground (shield) Always Below 1 V
      F37-16 (BCB+) - F36-4 (GND1) B - W-B Power source to front television camera Engine switch on (IG)
      Shift lever in R      		 5.8 to 7.0 V

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

    5. Reference (Oscilloscope waveform):
      Fig 2: Identifying Signal Waveform
      GTY247467Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT: 

      A waterproof connector is used for the front television camera assembly. Therefore, inspect the waveform at the parking assist ECU with the connector connected.

      1. Waveform 1 (under normal conditions) Reference
        Item Content
        Terminal No. (Symbol) F37-37 (BCV+) - F36-4 (GND1)
        Tool Setting 200 mV/DIV., 50 μsec./DIV.
        Condition Engine switch on (IG), shift lever in R

        HINT: 

        The video waveform changes according to the image sent by the front television camera assembly.

      2. Waveform 2 (camera lens is covered, blacking out the screen) Reference
        Item Content
        Terminal No. (Symbol) F37-37 (BCV+) - F36-4 (GND1)
        Tool Setting 200 mV/DIV., 50 μsec./DIV.
        Condition Engine switch on (IG), shift lever in R

        HINT: 

        The video waveform changes according to the image sent by the front television camera assembly.

        TEXT IN ILLUSTRATION

        *1 Waveform 1 (under normal conditions)
        *2 Waveform 2 (camera lens is covered, blacking out the screen)
        *3 Synchronized Signal
        *4 Video Waveform
  2. FRONT TELEVISION CAMERA ASSEMBLY 
    1. Disconnect the connector from the front television camera assembly.
      Fig 3: Identifying A43 Front Television Camera Assembly Connector Terminals
      GTY280749Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage of each terminal of the wire harness side connector.
      Terminal No. (Symbol) Terminal Description Condition Specified Condition
      A43-3 (BGND) - Body ground Ground Always Below 1 V
      A43-1 (BCB+) - A43-3 (BGND) Power source Engine switch on (IG)
      front and side monitor main switch on      		 5.8 to 7.0 V

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

    3. Reconnect the connector to the front television camera assembly.
    4. Check for pulses between each terminal of the connector.
      Terminal No. (Symbol) Terminal Description Condition Specified Condition
      A43-2 (BCV+) - A43-4 (BCV-) Display signal Engine switch on (IG)
      Front and side monitor main switch on
      Under normal conditions      		 Pulse generation
      (See waveform 1 in  1)
      Engine switch on (IG)
      Front and side monitor main switch on
      Camera lens covered, blacking out screen      		 Pulse generation
      (See waveform 2 in  2)

      HINT: 

      A waterproof connector is used for the front television camera assembly. Therefore, inspect the waveform at the parking assist ECU with the connector connected.

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

    5. Reference (Oscilloscope waveform):
      Fig 4: Identifying Signal Waveform
      GTY247467Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT: 

      A waterproof connector is used for the front television camera assembly. Therefore, inspect the waveform at the parking assist ECU with the connector connected.

      1. Waveform 1 (under normal conditions) Reference
        Item Content
        Terminal No. (Symbol) A43-2 (BCV+) - A43-4 (BCV-)
        Tool Setting 200 mV/DIV., 50 μsec./DIV.
        Condition Engine switch on (IG), front and side monitor main switch on

        HINT: 

        The video waveform changes according to the image sent by the front television camera assembly.

      2. Waveform 2 (camera lens is covered, blacking out the screen) Reference
        Item Content
        Terminal No. (Symbol) A43-2 (BCV+) - A43-4 (BCV-)
        Tool Setting 200 mV/DIV., 50 μsec./DIV.
        Condition Engine switch on (IG), front and side monitor main switch on

        HINT: 

        The video waveform changes according to the image sent by the front television camera assembly.

        TEXT IN ILLUSTRATION

        *1 Waveform 1 (under normal conditions)
        *2 Waveform 2 (camera lens is covered, blacking out the screen)
        *3 Synchronized Signal
        *4 Video Waveform
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