where are the fuses for the signal lights
I looked for the fuse box diagram and am not able to help you without knowing the year. They vary a lot. Take the cover off and you should see something like this
Or if you mean where are the fuses , see: http://www.carcarekiosk.com/video/2009_Nissan_Frontier_LE_4.0L_V6_Crew_Cab_Pickup/fuse_interior/replace....
Search Nissan Frontier Questions
Nissan Frontier Experts