a pair or harness under passanger and driver seat

I have a 2006 Nissan Quest S, no navigation unit but it has a DVD under the passanger seat facing the right side of the driver seat, however, around this area there are a pair of cables or harness, coming from under neat the carpet, my QUESTION IS are these cable for a navigation unit? is the 2006 S pre-wired for a navigation unit? Does anyone here has a picture of the a navigation unit and it is cables or harness.?
Please help me.
Thanks
Trinidad

Power seats
My guess would be that it is pre-wired for power seats.
I don't think you can convert a non-navigation screen to a navigation system. You would be better off buying an after market system.