I have the same problem I think our seat is not bolted on good enough

 

Rattles are in Nissan's DNA. They really should address this crap.

 

who ever designed the seat belt for our car is seriously retarded. and not just the belt holder on top, but the clicker position on the bottom too.

 

same problem, Its the upper half the seat that rattles. i moved it to a different location forward or back and it seems to have cleared the problem. it still moves quite a bit but doesn't make the noise it did before.