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Terminals Of Ecu [11/2023 - ]

  1. CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    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. Measure the voltage and resistance 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-26 (BECU) - Body ground Auxiliary battery power supply Ignition switch off 11 to 14 V
      MB-27 (IGR) - Body ground IG power supply Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V
      MB-14 (GND2) - Body ground Ground Always Always
    3. Reconnect the power distribution box assembly connectors.
    4. Measure the voltage according to the value(s) in the table below.
      Terminal No. (Symbol) Terminal Description Condition Specified Condition
      8G-4 - Body ground Rear center seat belt buckle switch signal Rear center seat belt fastened Below 1 V
      Rear center seat belt unfastened 11 to 14 V
      8G-8 - Body ground Rear RH seat belt buckle switch signal Rear RH seat belt fastened Below 1 V
      Rear RH seat belt unfastened 11 to 14 V
      8G-19 - Body ground Rear LH seat belt buckle switch signal Rear LH seat belt fastened Below 1 V
      Rear LH seat belt unfastened 11 to 14 V
      8G-24 - Body ground Rear door courtesy light switch (for LH) input Rear door LH open Below 1 V
      Rear door LH closed 11 to 14 V or pulse output (maximum 14 V)
      8G-31 - Body ground Rear door courtesy light switch (for RH) input Rear door RH open Below 1 V
      Rear door RH closed 11 to 14 V or pulse output (maximum 14 V)
  2. CHECK COMBINATION METER ASSEMBLY (except 12.3 Inch Display) 
    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 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 (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
      H21-25 (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
      H21-26 (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
  3. CHECK COMBINATION METER ASSEMBLY (for 12.3 Inch Display) 
    GTY1113451Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the H112 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
      H112-5 (B) - Body ground Auxiliary battery power supply Ignition switch off 11 to 14 V
      H112-6 (IG+) - Body ground Ignition power supply Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      H112-2 (ES) - Body ground Ground Always Below 1 Ω
      H112-38 (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
      H112-19 (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
      H112-35 (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
  4. CHECK AIRBAG SENSOR ASSEMBLY 
    GTY894357Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Terminal No. Terminal Symbol Destination
    M61-24 GNDL Front seat inner belt assembly LH
    M61-30 LBE+
    M10-18 GNDR Front seat inner belt assembly RH
    M10-27 RBE+
    M10-24 SVC Occupant classification sensor
    M10-31 SGD
    M10-32 SIG
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