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Terminals Of Ecu [04/2018 - ]

  1. CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    GTY874460Courtesy 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 [04/2018 - 08/2021] , or refer to REMOVAL [08/2021 - ]

    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) Wiring Color Terminal Description Condition Specified Condition
      MB-31 (BECU) - Body ground - Battery power supply Always 11 to 14 V
      MB-32 (IG) - Body ground - Ignition power supply (IG signal) Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      MB-30 (ACC) - Body ground - Ignition power supply (ACC signal) Engine switch on (ACC) 11 to 14 V
      Engine switch off 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
  2. CHECK COMBINATION METER ASSEMBLY 
    GTY858279Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the G16 combination meter assembly connector.
    2. 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) Wiring Color Terminal Description Condition Specified Condition
      G16-40 (B) - Body ground LA-B - Body ground Battery power supply Always 11 to 14 V
      G16-39 (IG+) - Body ground GR - Body ground Ignition power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      G16-21 (ES) - Body ground W-B - Body ground Ground Always Below 1 Ω
      G16-24 (RLSB) - Body ground SB - Body ground Rear LH seat belt buckle switch signal Rear LH seat belt fastened 10 kΩ or higher
      Rear LH seat belt unfastened Below 1 Ω
      G16-26 (RRSB) - Body ground LG - Body ground Rear RH seat belt buckle switch signal Rear RH seat belt fastened 10 kΩ or higher
      Rear RH seat belt unfastened Below 1 Ω
      G16-25 (RCSB) - Body ground B - Body ground Rear center seat belt buckle switch signal Rear center seat belt fastened 10 kΩ or higher
      Rear center seat belt unfastened Below 1 Ω
    3. Reconnect the G16 combination meter assembly connector.
    4. Measure the voltage according to the value(s) in the table below.
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      G16-18 (RLMT) - Body ground BE - Body ground Rear LH seat belt warning light output signal Engine switch on (IG), rear seat belt warning light (LH) off 11 to 14 V
      Engine switch on (IG), rear seat belt warning light (LH) on Below 1 V
      G16-20 (RRMT) - Body ground G - Body ground Rear center seat belt warning light output signal Engine switch on (IG), rear seat belt warning light (center) off 11 to 14 V
      Engine switch on (IG), rear seat belt warning light (center) on Below 1 V
      G16-19 (RCMT) - Body ground R - Body ground Rear RH seat belt warning light output signal Engine switch on (IG), rear seat belt warning light (RH) off 11 to 14 V
      Engine switch on (IG), rear seat belt warning light (RH) on Below 1 V
  3. AIRBAG ECU ASSEMBLY 
    GTY894462Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Terminal No. Terminal Symbol Destination
    K29-28 LBE+ Front seat inner belt assembly LH
    K29-27 LBE- Front seat inner belt assembly LH
  4. CHECK OCCUPANT DETECTION ECU 
    GTY929761Courtesy 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) Wiring Color Terminal Description Condition Specified Condition
      R7-10 (GND) - Body ground W-B - Body ground Ground Always Below 1 V
      R7-6 (IG) - R7-10 (GND) B - W-B Power source Engine switch on (IG) 11 to 14 V
      R7-9 (BGND) - R7-10 (GND) P - W-B Front passenger buckle switch ground Always Below 1 V
      R7-7 (BSW) - R7-9 (BGND) G - P Front passenger buckle switch signal Always Pulse generation
      R8-1 (SVC1) - R8-5 (SGD1) R - G Front occupant classification sensor LH power supply Engine switch on (IG) 11 to 14 V
      R8-2 (SVC3) - R8-6 (SGD3) GR - W Rear occupant classification sensor LH power supply Engine switch on (IG) 11 to 14 V
      R8-3 (SIG1) - R8-5 (SGD1) P - G Front occupant classification sensor LH signal Engine switch on (IG) Pulse generation
      R8-4 (SIG3) - R8-6 (SGD3) Y - W Rear occupant classification sensor LH signal Engine switch on (IG) Pulse generation
      R8-5 (SGD1) - R7-10 (GND) G - W-B Front occupant classification sensor LH ground Always Below 1 V
      R8-6 (SGD3) - R7-10 (GND) W - W-B Rear occupant classification sensor LH ground Always Below 1 V
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