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Terminals Of Ecu [12/2019 - 10/2022]

  1. CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    GTY1005869Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.

      Refer to REMOVAL [12/2019 - 10/2022]

    2. Reconnect the instrument panel junction block assembly connectors.
    3. Measure the resistance and voltage according to the value(s) in the table below.

      HINT: 

      Measure the values on the wire harness side with the connector disconnected.

    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 ON → off 11 to 14 V → Below 1 V
    MB-30 (ACC) - Body ground ACC power supply Ignition switch ACC → off 11 to 14 V → Below 1 V
    MB-11 (GND1) - Body ground Ground Always Below 1 Ω
    MB-2 (RCTY) - Body ground Rear door courtesy light switch RH input Rear door RH closed (OFF) 10 kΩ or higher
    Rear door RH open (ON) Below 1 Ω
    MB-13 (LCTY) - Body ground Rear door courtesy light switch LH input Rear door LH closed (OFF) 10 kΩ or higher
    Rear door LH open (ON) Below 1 Ω
    H42-19 (GND2) - Body ground Ground Always Below 1 Ω
  2. CHECK COMBINATION METER ASSEMBLY 
    GTY883344Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the H21 combination meter assembly connector.
    2. Measure the voltage and resistance according to the value(s) in the table below.
      Terminal No. (Symbol) Terminal Description Condition Specified Condition
      H21-40 (B) - Body ground Auxiliary battery power supply Ignition switch off*1
      Always*2      		 11 to 14 V
      H21-39 (IG+) - Body ground Ignition power supply Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      H21-21 (ES) - Body ground Ground Always Below 1 Ω
      H21-24 (RLSB) - Body ground Rear No. 1 seat belt LH buckle switch signal Rear No. 1 seat belt LH fastened 10 kΩ or higher
      Rear No. 1 seat belt LH unfastened Below 1 Ω
      H21-25 (RCSB) - Body ground*3 Rear No. 1 seat belt center buckle switch signal Rear No. 1 seat belt center fastened 10 kΩ or higher
      Rear No. 1 seat belt center unfastened Below 1 Ω
      H21-26 (RRSB) - Body ground Rear No. 1 seat belt RH buckle switch signal Rear No. 1 seat belt RH fastened 10 kΩ or higher
      Rear No. 1 seat belt RH unfastened Below 1 Ω
      H21-13 (RLBT) - Body ground Rear No. 2 seat belt LH buckle switch signal Rear No. 2 seat belt LH fastened 10 kΩ or higher
      Rear No. 2 seat belt LH unfastened Below 1 Ω
      H21-23 (RCBT) - Body ground Rear No. 2 seat belt center buckle switch signal Rear No. 2 seat belt center fastened 10 kΩ or higher
      Rear No. 2 seat belt center unfastened Below 1 Ω
      H21-3 (RRBT) - Body ground Rear No. 2 seat belt RH buckle switch signal Rear No. 2 seat belt RH fastened 10 kΩ or higher
      Rear No. 2 seat belt RH unfastened Below 1 Ω
      1. *1: for HV Model
      2. *2: for Gasoline Model
      3. *3: for 60/40 Split Seat Type (Rear No. 1 Seat)
  3. CHECK AIRBAG SENSOR ASSEMBLY 
    GTY894357Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Terminal No. Terminal Symbol Destination
    M61-28 LBE+ Front seat inner belt assembly LH
    M61-27 LBE- Front seat inner belt assembly LH
  4. CHECK OCCUPANT DETECTION ECU 
    GTY854455Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage and check for pulses according to the value(s) in the table below.
      Terminal No. (Symbol) Terminal Description Condition Specified Condition
      e2-10 (GND) - Body ground Ground Always Below 1 V
      e2-6 (IG2) - e2-10 (GND) Power source Ignition switch ON 11 to 14 V
      e2-9 (BGND) - e2-10 (GND) Front passenger buckle switch ground Always Below 1 V
      e2-7 (BSW) - e2-9 (BGND) Front passenger buckle switch signal Always Pulse generation
      e1-1 (SVC1) - e1-5 (SGD1) Front occupant classification sensor LH power supply Ignition switch ON 11 to 14 V
      e1-2 (SVC3) - e1-6 (SGD3) Rear occupant classification sensor LH power supply Ignition switch ON 11 to 14 V
      e1-3 (SIG1) - e1-5 (SGD1) Front occupant classification sensor LH signal Ignition switch ON Pulse generation
      e1-4 (SIG3) - e1-6 (SGD3) Rear occupant classification sensor LH signal Ignition switch ON Pulse generation
      e1-5 (SGD1) - e2-10 (GND) Front occupant classification sensor LH ground Always Below 1 V
      e1-6 (SGD3) - e2-10 (GND) Rear occupant classification sensor LH ground Always Below 1 V
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