Originally Posted by Bryan212

Not sure if this will help but when I installed my backup camera and bypass switch from the carkit company I blew a fuse. I replaced the fuse and still had no power to my nav screen. I checked every fuse in the car and even replaced some that weren't blown, I even took the whole fuse block out to check for burnt spots and still nothing. I finally decided to take it to the dealership to have the warranty cover my nav screen. I took out my camera and bypass switch and the screen still didn't work. I then decided to put all the fuses back to stock specs, I had some 10 amp fuses where 15 amp fuses should be and etc. After I did that I started the car up and the nav screen came on and worked fine. I still have no idea what the problem was but it has been working ever since.