Today the Key light on the dash come on, I thought it was a battery problem, but I tried with my other fob and the key light still wouldn't go away. Do you guys know what's wrong?

 

I think that means there's actually an issue with the security system. A low battery warning would actually be displayed in the center of the instrument cluster. Perhaps someone else here can chime in. Have you google this issue? I'm sure other nissan owners have seen it.