As was mentioned before (check the link) . . . it is probably just a connector that has come loose and you have no electrical connection (even though the connector may "look" like it is plugged together). . . .

I believe that the factory used tie wraps to hold the connectors together, so they would not seperate. If your seat has been repaired for the heating element issue, then it may be these tie wraps were not reinstalled. Hence the issue of the connection coming loose . . . So if you can get the bolts out and pull up the seat, I would suggest checking the connector for the tie wrap, if not there, then add one and you won't have an issue again.

Funny how one "small thing" like a tie wrap, could make such a fuss. And it could all be just one person's mistake (laziness ???), etc, to create the headache !

Just my two cents

Mark