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Terminals Of Ecu [08/2017 - ]

  1. CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND DRIVER SIDE JUNCTION BLOCK ASSEMBLY (w/ Rear Seat Belt Warning) 
    1. Disconnect the main body ECU (multiplex network body ECU) connectors.
      Fig 1: Main Body ECU (Multiplex Network Body ECU) And Driver Side Junction Block Assembly (W/ Rear Seat Belt Warning) Connector End View
      GTY760619Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A Main Body ECU (Multiplex Network Body ECU) with 1 Connector - -
      *1 Main Body ECU (Multiplex Network Body ECU) - -
      *a 1 Connector - -
      Fig 2: Main Body ECU (Multiplex Network Body ECU) And Driver Side Junction Block Assembly (W/ Rear Seat Belt Warning) Connector End View
      GTY752581Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A Main Body ECU (Multiplex Network Body ECU) with 2 Connectors - -
      *1 Main Body ECU (Multiplex Network Body ECU) - -
      *a 2 Connectors - -
    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.

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      MB-30 (BECU) - Body ground - Battery power supply Always 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-29 (ACC) - Body ground - Ignition power supply (ACC signal) Ignition switch ACC → off 11 to 14 V → Below 1 V
      MB-11 (GND1) - Body ground - Ground Always Below 1 Ω
      E31-1 (LCTY) - Body ground SB - Body ground Rear door courtesy light switch (LH) input Rear door LH closed (OFF) 10 kΩ or higher
      E31-1 (LCTY) - Body ground SB - Body ground Rear door courtesy light switch (LH) input Rear door LH open (ON) Below 1 Ω
      E31-6 (RCTY) - Body ground LG - Body ground Rear door courtesy light switch (RH) input Rear door RH closed (OFF) 10 kΩ or higher
      E31-6 (RCTY) - Body ground LG - Body ground Rear door courtesy light switch (RH) input Rear door RH open (ON) Below 1 Ω
  2. CHECK COMBINATION METER ASSEMBLY 
    1. Disconnect the E43 and E47*2 combination meter assembly connectors.
      Fig 3: Combination Meter Assembly Connector End View
      GTY741188Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance according to the value(s) in the table below.
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      E43-40 (B) - Body ground W - Body ground Battery power supply Always 11 to 14 V
      E43-39 (IG+) - Body ground P - Body ground Ignition power supply Ignition switch off Below 1 V
      E43-39 (IG+) - Body ground P - Body ground Ignition power supply Ignition switch ON 11 to 14 V
      E43-4 (EP) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E43-2 (RCMT) - Body ground*1, *2 L - Body ground Rear seat belt warning light center output signal Ignition switch ON, rear seat belt warning light center off 11 to 14 V
      Ignition switch ON, rear seat belt warning light center on Below 1 V
      E43-3 (RRMT) - Body ground*1, *2 G - Body ground Rear seat belt warning light RH output signal Ignition switch ON, rear seat belt warning light RH off 11 to 14 V
      Ignition switch ON, rear seat belt warning light RH on Below 1 V
      E43-22 (RRSB) - Body ground*1, *3 GR - Body ground Rear right seat belt buckle switch signal Ignition switch ON, rear seat belt RH unfastened Below 1 V
      Ignition switch ON, rear seat belt RH fastened 11 to 14 V
      E43-23 (RCSB) - Body ground*1, *3 SB - Body ground Rear center seat belt buckle switch signal Ignition switch ON, rear seat belt center unfastened Below 1 V
      Ignition switch ON, rear seat belt center fastened 11 to 14 V
      E43-24 (RLSB) - Body ground*1 V - Body ground Rear left seat belt buckle switch signal Ignition switch ON, rear seat belt LH unfastened Below 1 V
      Ignition switch ON, rear seat belt LH fastened 11 to 14 V
      E43-25 (RCSB) - Body ground*1, *2 SB - Body ground Rear center seat belt buckle switch signal Ignition switch ON, rear seat belt center unfastened Below 1 V
      Ignition switch ON, rear seat belt center fastened 11 to 14 V
      E43-25 (RLMT) - Body ground*1, *3 B - Body ground Rear seat belt warning light LH output signal Ignition switch ON, rear seat belt warning light LH off 11 to 14 V
      Ignition switch ON, rear seat belt warning light LH on Below 1 V
      E43-26 (RRSB) - Body ground*1, *2 GR - Body ground Rear right seat belt buckle switch signal Ignition switch ON, rear seat belt RH unfastened Below 1 V
      Ignition switch ON, rear seat belt RH fastened 11 to 14 V
      E43-26 (RCMT) - Body ground*1, *3 L - Body ground Rear seat belt warning light center output signal Ignition switch ON, rear seat belt warning light center off 11 to 14 V
      Ignition switch ON, rear seat belt warning light center on Below 1 V
      E43-27 (RRMT) - Body ground*1, *3 G - Body ground Rear seat belt warning light RH output signal Ignition switch ON, rear seat belt warning light RH off 11 to 14 V
      Ignition switch ON, rear seat belt warning light RH on Below 1 V
      E47-8 (RLMT) - Body ground*1, *2 B - Body ground Rear seat belt warning light LH output signal Ignition switch ON, rear seat belt warning light LH off 11 to 14 V
      Ignition switch ON, rear seat belt warning light LH on Below 1 V
      • *1: w/ Rear Seat Belt Warning
      • *2: for Multi-information Display (Color Type)
      • *3: for Multi-information Display (Segment LCD Type and Dot LCD Type)
  3. AIRBAG SENSOR ASSEMBLY 
    Fig 4: Airbag Sensor Assembly Connector End View
    GTY426929Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Terminal No. Terminal Symbol Destination
    L11-12 LBE- Front seat inner belt assembly LH
    L11-11 LBE+ Front seat inner belt assembly LH
    L47-13 FSR- Occupant detection ECU
    L47-12 FSR+ Occupant detection ECU
  4. CHECK OCCUPANT DETECTION ECU 
    1. Measure the voltage and check for pulses according to the value(s) in the table below.
      Fig 5: Occupant Detection ECU Connector End View
      GTY438729Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A for TMMMS Made *B for TMMC Made
      FOR TMMMS MADE

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      S2-1 (+B) - S2-3 (GND) W - W-B Battery Always 11 to 14 V
      S2-2 (DIA) GR Diagnosis (DLC3) -* -*
      S2-3 (GND) - Body ground W-B - Body ground Ground Always Below 1 V
      S2-4 (FSR-) - S2-3 (GND) LG - W-B Airbag sensor assembly communication line Always Below 1 V
      S2-5 (BGND) - S2-3 (GND) P - W-B Front passenger buckle switch ground line Always Below 1 V
      S2-6 (IG2) - S2-3 (GND) B - W-B Power source Ignition switch ON 11 to 14 V
      S2-7 (FSR+) - S2-4 (FSR-) L - LG Airbag sensor assembly communication line Ignition switch ON Pulse generation
      S2-8 (BSW) - S2-5 (BGND) G - P Front passenger buckle switch line Always Pulse generation
      S1-2 (SVC3) - S1-6 (SGD3) GR - W Occupant classification sensor LH power supply line Ignition switch ON 4.9 to 5.1 V
      S1-1 (SVC1) - S1-5 (SGD1) R - G Occupant classification sensor RH power supply line Ignition switch ON 4.9 to 5.1 V
      S1-4 (SIG3) - S1-6 (SGD3) SB - W Occupant classification sensor LH signal line Ignition switch ON Pulse generation
      S1-3 (SIG1) - S1-5 (SGD1) P - G Occupant classification sensor RH signal line Ignition switch ON Pulse generation
      S1-6 (SGD3) - S2-3 (GND) W - W-B Occupant classification sensor LH ground line Always Below 1 V
      S1-5 (SGD1) - S2-3 (GND) G - W-B Occupant classification sensor RH ground line Always Below 1 V
      FOR TMMC MADE

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      S2-1 (+B) - S2-3 (GND) W - W-B Battery Always 11 to 14 V
      S2-2 (DIA) GR Diagnosis (DLC3) -* -*
      S2-3 (GND) - Body ground W-B - Body ground Ground Always Below 1 V
      S2-4 (FSR-) - S2-3 (GND) Y - W-B Airbag sensor assembly communication line Always Below 1 V
      S2-5 (BGND) - S2-3 (GND) P - W-B Front passenger buckle switch ground line Always Below 1 V
      S2-6 (IG2) - S2-3 (GND) B - W-B Power source Ignition switch ON 11 to 14 V
      S2-7 (FSR+) - S2-4 (FSR-) L - Y Airbag sensor assembly communication line Ignition switch ON Pulse generation
      S2-8 (BSW) - S2-5 (BGND) G - P Front passenger buckle switch line Always Pulse generation
      S7-2 (SVC3) - S7-6 (SGD3) GR - W Occupant classification sensor LH power supply line Ignition switch ON 4.9 to 5.1 V
      S7-1 (SVC1) - S7-5 (SGD1) R - G Occupant classification sensor RH power supply line Ignition switch ON 4.9 to 5.1 V
      S7-4 (SIG3) - S7-6 (SGD3) Y - W Occupant classification sensor LH signal line Ignition switch ON Pulse generation
      S7-3 (SIG1) - S7-5 (SGD1) P - G Occupant classification sensor RH signal line Ignition switch ON Pulse generation
      S7-6 (SGD3) - S2-3 (GND) W - W-B Occupant classification sensor LH ground line Always Below 1 V
      S7-5 (SGD1) - S2-3 (GND) G - W-B Occupant classification sensor RH ground line Always Below 1 V
      • *: As this is a line that is connected to other systems, voltage changes according to the systems that are connected.

      If the result is not as specified, the occupant detection ECU may be malfunctioning.

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