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Terminals Of Ecu [10/2015 - 08/2019]

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2019 Lexus RX 450hL, 2019 Lexus RX 450h, 2018 Lexus RX 450hL, 2018 Lexus RX 450h, and 2017 Lexus RX 450h. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FORWARD RECOGNITION CAMERA 
    GTY615425Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the U14 forward recognition camera connector.
      NOTE:
      • DTCs may be output when connectors are disconnected during inspection. Therefore, be sure to clear the DTCs using the Techstream once the inspection has been completed.
      • Do not apply excessive force to the U14 forward recognition camera connector.
    2. Measure the voltage and resistance according to the value(s) in the table below.

      HINT: 

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      U14-7 (IGB) - Body ground SB - Body ground Power source Power switch on (IG) 11 to 14 V
      Power switch off Below 1 V
      U14-10 (GND) - Body ground BR - Body ground Ground Always Below 1 Ω
    3. Reconnect the U14 forward recognition camera connector.
    4. w/ Forward recognition with heater hood sub-assembly:

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      U14-1 (HTR) - Body ground B - Body ground Forward recognition with heater hood sub-assembly operation signal Power switch on (IG)
      Forward recognition with heater hood sub-assembly not operating      		 11 to 14 V
      Power switch on (IG)
      Forward recognition with heater hood sub-assembly operating      		 Below 1 V
    5. Measure the waveform according to the value(s) in the table below.
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      U14-2 (STRV) - U14-10 (GND) V - BR LIN communication signal Power switch on (IG) Pulse generation
    6. Check for pulses according to the value(s) in the table below.
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      U14-5 (CA1P) - U14-10 (GND) V - BR CAN communication signal Power switch on (IG) Pulse generation
      (See waveform 1)
      U14-11 (CA1N) - U14-10 (GND) P - BR CAN communication signal Power switch on (IG) Pulse generation
      (See waveform 2)
      U14-6 (CANH) - U14-10 (GND) B - BR CAN communication signal Power switch on (IG) Pulse generation
      (See waveform 1)
      U14-12 (CANL) - U14-10 (GND) W - BR CAN communication signal Power switch on (IG) Pulse generation
      (See waveform 2)
    7. WAVEFORM 1
      1. CAN communication signal
        Item Content
        Terminal Name Between U14-5 (CA1P) and U14-10 (GND)
        Between U14-6 (CANH) and U14-10 (GND)
        Tester Range 1 V/DIV., 10 μsec./DIV.
        Condition Power switch on (IG)

        HINT: 

        The waveform varies depending on the CAN communication signal.

        GTY527215Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    8. WAVEFORM 2
      1. CAN communication signal
        Item Content
        Terminal Name Between U14-11 (CA1N) and U14-10 (GND)
        Between U14-12 (CANL) and U14-10 (GND)
        Tester Range 1 V/DIV., 10 μsec./DIV.
        Condition Power switch on (IG)

        HINT: 

        The waveform varies depending on the CAN communication signal.

        GTY531906Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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