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Terminals Of Ecu

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  1. CHECK OCCUPANT CLASSIFICATION ECU 
    1. Measure the voltage of the connector.
      Fig 1: Identifying Occupant Classification ECU Terminals
      GTY247909Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      +B (L1-1) - GND (L1-3) R - W-B +B power source Always 11 to 14 V
      DIA (L1-2) - GND (L1-3) W - W-B Diagnosis (DLC3) Ignition switch ON Pulse generation
      GND (L1-3) - Body ground W-B - Body ground Ground Always Below 1 V
      FSR- (L1-4) - GND (L1-3) B - W-B Center airbag sensor communication line Always Below 1 V
      BGND (L1-5) - GND (L1-3) BR - W-B Passenger side buckle switch ground line Always Below 1 V
      IG (L1-7) - GND (L1-3) B - W-B IG power source Ignition switch ON 11 to 14 V
      FSR+ (L1-8) - FSR- (L1-4) W - B Center airbag sensor communication line Ignition switch ON Pulse generation
      BSW (L1-9) - BGND (L1-5) GR - BR Passenger side buckle switch line Buckle switch ON
      Buckle switch OFF      		 Pulse generation
      SGD1 (a1-1) - GND (L1-3) G - W-B Front occupant classification sensor LH ground line Always Below 1 V
      SGD2 (a1-2) - GND (L1-3) O - W-B Front occupant classification sensor RH ground line Always Below 1 V
      SGD3 (a1-3) - GND (L1-3) W - W-B Rear occupant classification sensor LH ground line Always Below 1 V
      SGD4 (a1-4) - GND (L1-3) BR - W-B Rear occupant classification sensor RH ground line Always Below 1 V
      SVC1 (a1-11) - SGD1 (a1-1) R - G Front occupant classification sensor LH power supply line Ignition switch ON, a load is applied to front occupant classification sensor LH 4.5 to 5.1 V
      SVC2 (a1-12) - SGD2 (a1-2) W - O Front occupant classification sensor RH power supply line Ignition switch ON, a load is applied to front occupant classification sensor RH 4.5 to 5.1 V
      SVC3 (a1-5) - SGD3 (a1-3) GR - W Rear occupant classification sensor LH power supply line Ignition switch ON, a load is applied to rear occupant classification sensor LH 4.5 to 5.1 V
      SVC4 (a1-6) - SGD4 (a1-4) V - BR Rear occupant classification sensor RH power supply line Ignition switch ON, a load is applied to rear occupant classification sensor RH 4.5 to 5.1 V
      SIG1 (a1-7) - SGD1 (a1-1) SB - G Front occupant classification sensor LH signal line Ignition switch ON, a load is applied to front occupant classification sensor LH 0.2 to 4.7 V
      SIG2 (a1-8) - SGD2 (a1-2) L - O Front occupant classification sensor RH signal line Ignition switch ON, a load is applied to front occupant classification sensor RH 0.2 to 4.7 V
      SIG3 (a1-9) - SGD3 (a1-3) Y - W Rear occupant classification sensor LH signal line Ignition switch ON, a load is applied to rear occupant classification sensor LH 0.2 to 4.7 V
      SIG4 (a1-10) - SGD4 (a1-4) R - BR Rear occupant classification sensor RH signal line Ignition switch ON, a load is applied to rear occupant classification sensor RH 0.2 to 4.7 V
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