Camry 2012+ :: Seatbelt Light Came On And Began To Chime When Driving At 45 - 50mph

2012 Camry SE I4, non-entune, no roof, Kentucky built in spring '12.

Tonight on the way home, driving in light traffic, roughly 45-50mph seatbelt light came on and began to chime. I was wearing my seatbelt at the time, and had nothing in the passenger seat. When approaching a stoplight, the light went out and the chime stopped upon braking. I am going to take it in tomorrow to have it checked, but am assuming the dealer will find nothing. I looked under the dr. seat and there wasn't anything that could have pulled on the wiring.

So again, briefly:

During light traffic with seat belt buckled properly, seat belt light illuminates and chime starts. Upon braking for stop light the seatbelt light went out and chime stopped.

This is kind of a big deal to me because this is my wife's primary vehicle and the airbag will not work with the seatbelt light illuminated.