Funny, I got this yesterday. Here's what happened. I was taking my wife to lunch; as she got in the car she adjusted the seat rearward and as I drove off the warning popped on. I'm not sure (this is my speculation) but I think the seat wasn't "clicked in" the track because it was flush against the rear wall. I had her move it up a bit and made sure I heard the "click in" and the warning disappeared.

Clearly, I have the standard (manual adjust) seats.