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Terminals Of Ecu [12/2019 - 11/2023]

  1. CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    GTY851097Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

      Refer to REMOVAL [12/2019 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023]

    2. Reconnect the instrument panel junction block assembly connectors.
    3. Measure the resistance and voltage according to the value(s) in the table below.
      Terminal No. (Symbol) Terminal Description Condition Specified Condition
      MB-31 (BECU) - Body ground Auxiliary battery power supply Ignition switch off*1
      Always*2      		 11 to 14 V
      MB-32 (IG) - Body ground Ignition power supply (IG signal) Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      MB-30 (ACC) - Body ground Ignition power supply (ACC signal) Ignition switch off Below 1 V
      Ignition switch ACC 11 to 14 V
      MB-11 (GND1) - Body ground Ground Always Below 1 Ω
      H42-19 (GND2) - Body ground Ground Always Below 1 Ω
      H43-1 (FLCY) - Body ground Front door courtesy light switch assembly (for LH) input Front door LH closed 10 kΩ or higher
      Front door LH open Below 1 Ω
      H43-6 (FRCY) - Body ground Front door courtesy light switch assembly (for RH) input Front door RH closed 10 kΩ or higher
      Front door RH open Below 1 Ω
      MB-13 (LCTY) - Body ground Rear door courtesy light switch assembly (for LH) input Rear door LH closed 10 kΩ or higher
      Rear door LH open Below 1 Ω
      MB-2 (RCTY) - Body ground Rear door courtesy light switch assembly (for RH) input Rear door RH closed 10 kΩ or higher
      Rear door RH open Below 1 Ω
      H43-30 (HCTY) - Body ground Engine hood courtesy switch input Engine hood open 10 kΩ or higher
      Engine hood closed Below 1 Ω
      MB-4 (BCTY) - Body ground Back door courtesy light switch input Back door closed 10 kΩ or higher
      Back door open Below 1 Ω
      MB-14 (TRLY) - Body ground Taillight relay drive output Ignition switch off 11 to 14 V
      1. *1: for HV Model
      2. *2: for Gasoline Model
    4. Install the main body ECU (multiplex network body ECU) to instrument panel junction block assembly.

      Refer to INSTALLATION [12/2019 - 10/2022] , or refer to INSTALLATION [10/2022 - 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
      4B-13 (LSFL) - Body ground Front door LH unlock detection switch input Front door LH unlocked Below 1 V
      Front door LH locked 11 to 14 V
      4B-12 (LSFR) - Body ground Front door RH unlock detection switch input Front door RH unlocked Below 1 V
      Front door RH locked 11 to 14 V
      H44-18 (L2) - Body ground Driver door key-linked lock input Driver door key cylinder turned to lock position Below 1 V
      Driver door key cylinder off 11 to 14 V
      H44-17 (UL3) - Body ground Driver door key-linked unlock input Driver door key cylinder turned to unlock position Below 1 V
      Driver door key cylinder off 11 to 14 V
      4B-14 (LSWL) - Body ground Rear door LH unlock detection switch input Rear door LH unlocked Below 1 V
      Rear door LH locked 11 to 14 V
      H43-17 (LSWR) - Body ground Rear door RH unlock detection switch input Rear door RH unlocked Below 1 V
      Rear door RH locked 11 to 14 V
      4A-20 (SH) - Body ground Security horn assembly drive Security horn assembly sounding
      (Theft deterrent system in alarm sounding state)      		 Pulse generation
      (Below 1 V ← → 11 to 14 V)
      4C-27 (HORN) - Body ground Vehicle horn drives Vehicle horn sounding
      (Theft deterrent system in alarm sounding state)      		 Pulse generation
      (Below 1 V ← → 11 to 14 V)
      4C-31 (HRLY) - Body ground H-LP LH relay drive output Low beams blinking
      (Theft deterrent system in alarm sounding state)      		 Pulse generation (Below 1 V ← → 11 to 14 V)
      H43-12 (HRY2) - Body ground H-LP RH relay drive output Low beams blinking
      (Theft deterrent system in alarm sounding state)      		 Pulse generation (Below 1 V ← → 11 to 14 V)
      4B-29 (ILE) - Body ground Interior lights drive output Interior lights illuminated
      (Theft deterrent system in alarm sounding state)      		 Below 1 V
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