Cold this morning and over rough road heard rattle noise that seemed to come from front-passenger seat back. Never heard it before over first approx 1,500 miles. Anyone else hear this or had fixed?

 

Well I don't have that kinda rattle. But my rattle seems to be coming out from the center console. I have to lay my arm over it to prevent it from rattling when driving on rough road.

2004 G35 Coupe 5AT
Black/Graphite Ltr
Tire Pkg

 

It could be your passenger seat belt top bracket.

SKYLINE 350GT, NISMO R-Tune.