I removed the seats to my 2002 Dodge Intrepid SE and noticed that there was a small cable sticking out from the carpet underneath the seats. Since I have the SE model my car didn't come with the power seats. My question is are those cables there to attach the power seats?
Maybe - but there are other cables that go to car seats. Some cars have heated seats (bun warmers, I call them). Many newer cars have a pressure switch in the front passenger seat to deactivate the passenger side air bag if the seat is empty.
Yes, all wire harnesses are made to serve the power needs of all possible options rather than building different harnesses for each individual car.