Why does the seat belt light stay on? on 2002 Lincoln LS

Fuses were checked and found to be okay.

Asked by for the 2002 Lincoln LS
Anything laying in the other seat, laptop pc maybe??
Good job, forgot about passenger presence.
It's just that climate in POTWIN F.....G KANSAS!! Cant be that many people from there! If it is damned if i dont go there and build a repair shop! And hire about 10 techs..
They sure don't want to say where they are really from!
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1 more answer , 1 more comment
Inside the receiver seat belt is a sensor that recognizes the male end of the other belt and shuts off when buckled. More then likely the sensor has gotten dirty or the wire connection at the base of the belt has been broken or such. If the receiver end has gone bad, the belt needs to be replaced.
Thank you....I will check the sensor. There is nothing in the passenger seat.

In response to the other two answers...don't know why it came up that I live in Kansas...I live in Florida. Hope that answers your questions.