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Terminals Of Ecu

  1. CHECK PARKING ASSIST ECU 
    Fig 1: Parking Assist ECU Connector Terminal Identification
    GTY271240Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage, resistance and check for pulses according to the value(s) in the table below.
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      I3-1 (+B) - I3-3 (GND1) L - W-B Power source signal Always 11 to 14 V
      I3-7 (IG) - I3-3 (GND1) L - W-B IG power source signal Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      I3-8 (ACC) - I3-3 (GND1) P - W-B ACC power source signal Engine switch on (ACC) 11 to 14 V
      Engine switch off Below 1 V
      I3-23 (BLSW) - I3-3 (GND1) L - W-B Front and side monitor main switch power source signal Engine switch on (IG), wide view front and side monitor switch on 11 to 14 V
      Engine switch on (IG), wide view front and side monitor switch off Below 1 V
      I3-3 (GND1) - Body ground W-B - Body ground Ground Always Below 1 Ω
      I2-25 (BGND) - Body ground GR - Body ground Front television camera shielded ground Always Below 1 V
      I2-26 (BCB+) - I3-3 (GND1) B - W-B Front television camera power source signal Wide view front monitor display screen displayed 5.8 to 7.05 V
      I2-24 (BCV+) - I3-23 (BCV-) R - W Display signal Wide view front monitor display screen displayed Pulse generation
      (See waveform 1)
      Camera lens covered to make image black while wide view front monitor display screen displayed Pulse generation
      (See waveform 2)
      I2-23 (BCV-) - I3-3 (GND1) W - W-B Front television camera ground Always Below 1 V
    2. Using an oscilloscope, check waveform 1.
      Fig 2: Identifying Waveform 1
      GTY183093Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      MEASUREMENT CONDITION

      Item Content
      Terminal No. (Symbol) I2-24 (BCV+) - I2-23 (BCV-)
      Tool Setting 0.2 V/DIV., 50 μs/DIV.
      Condition Wide view front monitor display screen displayed
    3. Using an oscilloscope, check waveform 2.
      Fig 3: Identifying Waveform 2
      GTY154264Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      MEASUREMENT CONDITION

      Item Content
      Terminal No. (Symbol) I2-24 (BCV+) - I2-23 (BCV-)
      Tool Setting 0.2 V/DIV., 50 μs/DIV.
      Condition Camera lens covered to make image black while wide view front monitor display screen displayed
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