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Terminals Of Ecu

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  1. CHECK OCCUPANT DETECTION ECU 
    Fig 1: Occupant Detection ECU Connector Terminal Identification
    GTY376486Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT: 

    Since the occupant detection ECU uses waterproof connectors, the voltage and waveform cannot be inspected directly. Standard voltage readings and waveforms are indicated for reference only.

    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
      L1-1 (+B) - L1-3 (GND) R - W-B Battery power supply Always 11 to 14 V
      L1-2 (DIA) - L1-3 (GND) W - W-B Diagnosis (DLC3) Power switch on (IG) Pulse generation
      L1-3 (GND) - Body ground W-B - Body ground Ground Always Below 1 V
      L1-4 (FSR-) - L1-3 (GND) B - W-B Center airbag sensor assembly communication line Always Below 1 V
      L1-5 (BGND) - L1-3 (GND) BR - W-B Front seat belt buckle switch RH ground line Always Below 1 V
      L1-7 (IG) - L1-3 (GND) B - W-B Power switch power supply Power switch on (IG) 11 to 14 V
      L1-8 (FSR+) - L1-4 (FSR-) W - B Center airbag sensor assembly communication line Power switch on (IG) Pulse generation
      L1-9 (BSW) - L1-5 (BGND) GR - BR Front seat belt buckle switch RH line Always Pulse generation
      a1-1 (SGD1) - L1-3 (GND) G - W-B Front occupant classification sensor LH ground line Always Below 1 V
      a1-2 (SGD2) - L1-3 (GND) O - W-B Front occupant classification sensor RH ground line Always Below 1 V
      a1-3 (SGD3) - L1-3 (GND) W - W-B Rear occupant classification sensor LH ground line Always Below 1 V
      a1-4 (SGD4) - L1-3 (GND) BR - W-B Rear occupant classification sensor RH ground line Always Below 1 V
      a1-11 (SVC1) - a1-1 (SGD1) R - G Front occupant classification sensor LH power supply line Power switch on (IG), load applied to front occupant classification sensor LH 4.9 to 5.1 V
      a1-12 (SVC2) - a1-2 (SGD2) W - O Front occupant classification sensor RH power supply line Power switch on (IG), load applied to front occupant classification sensor RH 4.9 to 5.1 V
      a1-5 (SVC3) - a1-3 (SGD3) GR - W Rear occupant classification sensor LH signal line Power switch on (IG), load applied to rear occupant classification sensor LH 4.9 to 5.1 V
      a1-6 (SVC4) - a1-4 (SGD4) V - BR Rear occupant classification sensor RH signal line Power switch on (IG), load applied to rear occupant classification sensor RH 4.9 to 5.1 V
      a1-7 (SIG1) - a1-1 (SGD1) SB - G Front occupant classification sensor LH signal line Power switch on (IG), load applied to front occupant classification sensor LH 0 to 5.1 V
      a1-8 (SIG2) - a1-2 (SGD2) L - O Front occupant classification sensor RH signal line Power switch on (IG), load applied to front occupant classification sensor RH 0 to 5.1 V
      a1-9 (SIG3) - a1-3 (SGD3) Y - W Rear occupant classification sensor LH power supply line Power switch on (IG), load applied to rear occupant classification sensor LH 0 to 5.1 V
      a1-10 (SIG4) - a1-4 (SGD4) R - BR Rear occupant classification sensor RH power supply line Power switch on (IG), load applied to rear occupant classification sensor RH 0 to 5.1 V
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