I bought my first BMW 2 days ago and I was vacuuming the back seat and when I went to return the passenger seat to the original position, all the functions worked perfectly except for the seatback tilt feature. The motor was working, but nothing was moving. I began to panic and tried a few different things. Finally, I went back outside for one more go-round and I lifted up the manual latch to move it back and used some slight force past the resistance point. Voila! The seat fell flat backwards up against the rear seat...When I used the recline button again, it started to come forward and worked as usual and I do not recommend it.
This was probably not the best way to do it, but I believe I may have went into a panic and wanted it to work. Either way, it is still under warranty and I will be talking to the dealer about it. Hopefully they can rectify the situation correctly, instead of using force like me.