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.
2012 Toyota Prius TwoFACTORY OEM SERVICE PROCEDURE
Occupant Classification System
OCCUPANT CLASSIFICATION SYSTEM DTC IDENTIFICATION
| DTC Code | Description |
|---|---|
| B1771 | Passenger Side Buckle Switch Circuit Malfunction |
| B1780 | Front Occupant Classification Sensor LH Circuit Malfunction |
| B1781 | Front Occupant Classification Sensor RH Circuit Malfunction |
| B1782 | Rear Occupant Classification Sensor LH Circuit Malfunction |
| B1783 | Rear Occupant Classification Sensor RH Circuit Malfunction |
| B1785 | Front Occupant Classification Sensor LH Collision Detection |
| B1786 | Front Occupant Classification Sensor RH Collision Detection |
| B1787 | Rear Occupant Classification Sensor LH Collision Detection |
| B1788 | Rear Occupant Classification Sensor RH Collision Detection |
| B1790 | Center Airbag Sensor Assembly Communication Circuit Malfunction |
| B1793 | Occupant Classification Sensor Power Supply Circuit Malfunction |
| B1794 | Open in Occupant Classification ECU Battery Positive Line |
| B1795 | Occupant Classification ECU Malfunction |
| B1796 | Sleep Operation Failure of Occupant Classification ECU |
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.
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