Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2013 Toyota Prius TwoFACTORY OEM SERVICE PROCEDURE
Terminals Of Ecu
WARNING: This page is about a different variant/trim than selected.
- OCCUPANT DETECTION ECU
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Terminal No. (Symbol) Wiring Color Terminal Description Condition Specification W3-1 (+B) - W3-3 (GND) W - W-B Auxiliary battery Power switch off 11 to 14 V W3-2 (DIA) - W3-3 (GND) GR - W-B Diagnosis (DLC3) Power switch on (IG) Pulse generation W3-3 (GND) - Body ground W-B - Body ground Ground Always Below 1 V W3-4 (FSR-) - W3-3 (GND) LG - W-B Airbag ECU assembly communication line Always Below 1 V W3-5 (BGND) - W3-3 (GND) P - W-B Passenger side buckle switch ground line Always Below 1 V W3-7 (IG2) - W3-3 (GND) B - W-B Power source Power switch on (IG) 11 to 14 V W3-8 (FSR+) - W3-4 (FSR-) L - LG Airbag ECU assembly communication line Power switch on (IG) Pulse generation W3-9 (BSW) - W3-5 (BGND) G - P Passenger side buckle switch line Always Pulse generation W2-1 (SGD1) - W3-3 (GND) G - W-B Front occupant classification sensor LH ground line Always Below 1 V W2-2 (SGD2) - W3-3 (GND) LG - W-B Front occupant classification sensor RH ground line Always Below 1 V W2-3 (SGD3) - W3-3 (GND) W - W-B Rear occupant classification sensor LH ground line Always Below 1 V W2-4 (SGD4) - W3-3 (GND) BR - W-B Rear occupant classification sensor RH ground line Always Below 1 V W2-5 (SVC3) - W2-3 (SGD3) GR - W Rear occupant classification sensor LH power supply line Power switch on (IG) 4.9 to 5.1 V W2-6 (SVC4) - W2-4 (SGD4) V - BR Rear occupant classification sensor RH power supply line Power switch on (IG) 4.9 to 5.1 V W2-7 (SIG1) - W2-1 (SGD1) P - G Front occupant classification sensor LH signal line Power switch on (IG), a load applied to front occupant classification sensor LH 0 to 5.1 V W2-8 (SIG2) - W2-2 (SGD2) L - LG Front occupant classification sensor RH signal line Power switch on (IG), a load applied to front occupant classification sensor RH 0 to 5.1 V W2-9 (SIG3) - W2-3 (SGD3) SB - W Rear occupant classification sensor LH signal line Power switch on (IG), a load applied to rear occupant classification sensor LH 0 to 5.1 V W2-10 (SIG4) - W2-4 (SGD4) B - BR Rear occupant classification sensor RH signal line Power switch on (IG), a load applied to rear occupant classification sensor RH 0 to 5.1 V W2-11 (SVC1) - W2-1 (SGD1) R - G Front occupant classification sensor LH power supply line Power switch on (IG) 4.9 to 5.1 V W2-12 (SVC2) - W2-2 (SGD2) W - LG Front occupant classification sensor RH power supply line Power switch on (IG) 4.9 to 5.1 V
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.