Where is the stereo fuse 2004 sentra If there is one. Pls. don't give stupid answers like in the fuse box or check the fuse box map This car doesn't have a slot that says radio like most cars?
check the fuse box on under the hood, because you may have
blowned one responsible for powering your stereo " from the yellow
wire 12v you connected on your stereo" check all the red fuse
"10amp" until you see a brocken one.
if you find the brocken fuse and replaced it ..........and you
still see a problem......well at list you have fix the primary
source of the problem. I gess you my have to check each individual
fuses on the left side of the passenger site, until you find dead
ones..
PS. even if you find a dead fuse, just check all of them, it may
be more then one effecting the problem. I know, because it happen
to me for my 2006 sentra