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Terminals Of Ecu [11/2023 - ]

NOTE:
  • After turning the ignition switch to off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

    Refer to PRECAUTION [11/2023 - ]

  • When disconnecting the cable from the negative (-) auxiliary battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected.

    Refer to BEFORE DISCONNECTING BATTERY [11/2023 - ]

  • When disconnecting and reconnecting the auxiliary battery.

    HINT: 

    When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.

    Refer to AUTOMATIC LEARNING CHART [11/2023 - ]

  1. CHECK POWER DISTRIBUTION BOX ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 
    GTY1250047Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

      Refer to REMOVAL [11/2023 - ]

    2. Reconnect the power distribution box assembly connectors.

      Refer to INSTALLATION [11/2023 - ]

    3. Measure the voltage, resistance and check for pulses according to the value(s) in the table below.
      Terminal No. (Symbol) Terminal Description Condition Specified Condition
      MB-13 (GND1) - Body ground Ground Always Below 1 Ω
      MB-14 (GND2) - Body ground Ground Always Below 1 Ω
      MB-26 (BECU) - Body ground Auxiliary battery power supply Always 11 to 14 V
      MB-27 (IGR) - Body ground IG power supply Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      MB-22 (CXP1) - Body ground CXPI communication line Ignition switch off Below 1 V
      Ignition switch ON Pulse generation
    4. Install the main body ECU (multiplex network body ECU) to the power distribution box assembly.

      Refer to INSTALLATION [11/2023 - ]

    5. Measure the voltage and check for pulses according to the value(s) in the table below.
      Terminal No. (Symbol) Terminal Description Condition Specified Condition
      8E-5 - Body ground CXPI communication line Ignition switch ON Pulse generation
      8G-43 - Body ground Rear window defogger signal (output) Rear window defogger switch off Below 1.5 V
      Rear window defogger switch on 8 to 14 V
      8E-18 - Body ground Taillight output Taillight not illuminated Below 1.5 V
      8G-30 - Body ground
      8B-2 - Body ground Mirror heater drive voltage (output) Rear window defogger switch off Below 1 V
      Rear window defogger switch on 11 to 14 V
      8G-38 - Body ground Back-up light output Ignition switch ON, shift position is not R Below 1.5 V
      8C-2 - Body ground Ignition switch ON, shift position is R 8 to 14 V
      8G-22 - Body ground Panel illumination output Panel illumination not illuminated Below 1.5 V
      8C-53 - Body ground Panel illumination illuminated 8 to 14 V
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