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Home >> Toyota >> 2021 >> Corolla L >> Repair and Diagnosis >> External Pages >> Different car >> Section 17 (Seat Belt Warning System (W/ Occupant Classification System) - Diagnostics & Symptom Tests (Model Code: ZRE172)) >> SEAT BELT WARNING SYSTEM (W/ Occupant Classification System) >> Terminals Of Ecu [08/2016 - 08/2017] >> Terminals Of Ecu [08/2016 - 08/2017]
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Terminals Of Ecu [08/2016 - 08/2017]

WARNING: This page is about a different car, the 2018 Toyota Corolla, 2017 Toyota Corolla, 2016 Toyota Corolla, 2015 Toyota Corolla, and 2014 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK COMBINATION METER ASSEMBLY 
    1. Disconnect the E43 combination meter assembly connector.
      Fig 1: E43 Combination Meter Assembly Connector End View
      GTY456085Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance 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
      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

      If the result is not as specified, there may be a malfunction in the wire harness.

  2. CHECK AIRBAG SENSOR ASSEMBLY 
    Fig 2: 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
  3. CHECK OCCUPANT DETECTION ECU 
    1. Measure the voltage and check for pulses according to the value(s) in the table below.
      Fig 3: 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 - GR 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 - GR 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) GR - 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) R - G Occupant classification sensor LH power supply line Ignition switch ON 4.9 to 5.1 V
      S7-1 (SVC1) - S7-5 (SGD1) V - BR Occupant classification sensor RH power supply line Ignition switch ON 4.9 to 5.1 V
      S7-4 (SIG3) - S7-6 (SGD3) P - G Occupant classification sensor LH signal line Ignition switch ON Pulse generation
      S7-3 (SIG1) - S7-5 (SGD1) B - BR Occupant classification sensor RH signal line Ignition switch ON Pulse generation
      S7-6 (SGD3) - S2-3 (GND) G - W-B Occupant classification sensor LH ground line Always Below 1 V
      S7-5 (SGD1) - S2-3 (GND) BR - 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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