Here's the picture of the connector.
Keep in mind that this is from my 03.
If you have this connector under each seat, running into the seat back and it is unplugged, you do not have the elements in the seats.
On the other hand, if you do and it is plugged in, then the elements are there.
If this plug is missing, then you car was never wired for them in the first place.
Again, this picture was taken in a 2003 Disco S (Duragrain Seats).
HTH.