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Terminals Of Ecu [08/2013 - ]

  1. CHECK OCCUPANT CLASSIFICATION ECU 
    Fig 1: Occupant Classification ECU Connector Terminal Identification
    GTY278326Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the resistance and voltage according to the value(s) in the table below.
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      a4-1 (+B) - a4-3 (GND) W - W-B Battery power supply Always 11 to 14 V
      a4-2 (DIA) - a4-3 (GND) GR - W-B Diagnosis (DLC3) Engine switch on (IG) Pulse generation
      a4-3 (GND) - Body ground W-B - Body ground Ground Always Below 1 V
      a4-4 (FSR-) - a4-3 (GND) LG - W-B Center airbag sensor assembly communication line Always Below 1 V
      a4-5 (BGND) - a4-3 (GND) P - W-B Front passenger side buckle switch ground line Always Below 1 V
      a4-7 (IG2) - a4-3 (GND) B - W-B Engine switch power supply Engine switch on (IG) 11 to 14 V
      a4-8 (FSR+) - a4-4 (FSR-) L - LG Center airbag sensor assembly communication line Engine switch on (IG) Pulse generation
      a4-9 (BSW) - a4-5 (BGND) G - P Front passenger side buckle switch line Always Pulse generation
      a3-1 (SGD1) - a4-3 (GND) G - W-B Front occupant classification sensor LH ground line Always Below 1 V
      a3-2 (SGD2) - a4-3 (GND) LG - W-B Front occupant classification sensor RH ground line Always Below 1 V
      a3-3 (SGD3) - a4-3 (GND) W - W-B Rear occupant classification sensor LH ground line Always Below 1 V
      a3-4 (SGD4) - a4-3 (GND) BR - W-B Rear occupant classification sensor RH ground line Always Below 1 V
      a3-11 (SVC1) - a3-1 (SGD1) R - G Front occupant classification sensor LH power supply line Engine switch on (IG), load applied to front occupant classification sensor LH 4.9 to 5.1 V
      a3-12 (SVC2) - a3-2 (SGD2) W - LG Front occupant classification sensor RH power supply line Engine switch on (IG), load applied to front occupant classification sensor RH 4.9 to 5.1 V
      a3-5 (SVC3) - a3-3 (SGD3) GR - W Rear occupant classification sensor LH signal line Engine switch on (IG), load applied to rear occupant classification sensor LH 4.9 to 5.1 V
      a3-6 (SVC4) - a3-4 (SGD4) V - BR Rear occupant classification sensor RH signal line Engine switch on (IG), load applied to rear occupant classification sensor RH 4.9 to 5.1 V
      a3-7 (SIG1) - a3-1 (SGD1) P - G Front occupant classification sensor LH signal line Engine switch on (IG), load applied to front occupant classification sensor LH 0 to 5.1 V
      a3-8 (SIG2) - a3-2 (SGD2) L - LG Front occupant classification sensor RH signal line Engine switch on (IG), load applied to front occupant classification sensor RH 0 to 5.1 V
      a3-9 (SIG3) - a3-3 (SGD3) SB - W Rear occupant classification sensor LH power supply line Engine switch on (IG), load applied to rear occupant classification sensor LH 0 to 5.1 V
      a3-10 (SIG4) - a3-4 (SGD4) B - BR Rear occupant classification sensor RH power supply line Engine switch on (IG), load applied to rear occupant classification sensor RH 0 to 5.1 V

      If the result is not as specified, the ECU may have a malfunction.

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