Intelligent Key Fob Not Working

370Zila

Hey guys I need some help. I was working on my 370 and disconnected the negative terminal of the battery. I left my key fob inside the car overnight in the garage and the battery was disconnected all night as well. When I went in to work on it in the morning, I plugged the negative terminal of the battery back in and tried to lock the car with the remote but it wouldn't lock. The key wouldn't get registered by the car, and all it said was "No Key" on the screen to the left of the speedo.

I replaced the battery in the remote, but it still is not getting recognized. The only way to start the car is to put the fob into the port on the left side of the steering wheel.

What could be the issue? The fob was working perfectly fine before so I'm stumped. I checked the fuse box inside the car, and fuse box 3 inside the engine.

It's a 2012 370Z.

Thanks for any advice.