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The 2003 Nissan Frontier radio fuse location is listed on the inside cover of the fuse box. The radio fuse should be the very top fuse in the second role of fuses.
http://www.nissanextendedwarranty.com/owners-manual/nissan/2003-Nissan-Maxima.pdf page 8-22
The fuse for the stereo in a 2003 Nissan Pathfinder is in the fuse box under the dash on the driver's side. There are two fuses here for Audio, one in each of the last two columns.
There are four and disarm with screwdrive for the seats and remove fuse and disconnect batt.
The fuse box is located under the hood next to the battery.
it is located in the in cab fuse box labeled as mirror.
look for the airbag fuse in the fuse box.
2003 altima Nissan 2 5 where wiper relay locathion
2001lincon navigator
2003 xterra fuse boxThere two fuse panels. One is under the left drivers side under the dimmer switch, and the second box is under the hood next to the battery.
You can get a copy of the fuse box diagram chart for the 2003 Nissan Sentra online at places like Modified Life and Car Care Kiosk. You can also find these diagrams on the inside of the fuse box cover or in the Chilton's manual for that year and model of vehicle.
Not positive but I think the newer models (with airbags) use the same fuse for horn and airbag. If you don't have airbags I don't think they used a fuse, it may just be wired directly.