I placed a pizza on the passenger seat yesterday and the seat belt warning sounded loudly for the prescribed 100 seconds. Only solution was to fasten the seat belt. Will take to dealer. Obviously, this sensor is set far too low. On my Prius it took 20 lbs. to trigger it. Anyone else seeing this? I later placed my cell phone on the passenger seat and that triggered it too. The seat-belt solution works but is inconvenient for my next passenger. Also, would deploy the passenger airbag unnecessarily in an accident.