if you can access the underside of the floor you could look.
I would also look at the breaker box and see if there is a circuit labeled for them. Or try a non contact AC power meter, one of those little sticks that lights up when it gets near AC. if you run that over the floor and it lights up. . . Then you can confirm by moving the switch.
[FONT="Franklin Gothic Medium"][SIZE="3"][B]Everyone is entitled to their own opinion, but not their own facts[/B][/SIZE][/FONT]