Hope you got the problem solved man. If this happens again, You can force your Nissan radio unit to do a hard soft-reboot. Here's howSo, I hop in my car and pull out of my garage, and I'm sitting in my driveway getting Android Auto connected and messing with my climate controls, when a phone call rings in. I don't recognize the number so I use call screen. Then I get ready to roll and notice that my backup camera isn't working. I go in and out of reverse a few times. No luck. The car knows I'm in reverse because the dashboard shows R, and the correct parking sensors start beeping, but no camera image.
Thinking it's a software glitch, I turn the car off and start it again. Still doesn't work. Made it all the way to work and backed into my parking space, still doesn't work.
So looking around the web a bit it seems like there are somewhat similar complaints, but this one is a bit different. Others complain about about a black screen. I don't have a black screen, the central display just shows what it would if I was in N or a forward gear. It's like the infotainment system isn't clued into the fact that I'm in reverse. The rest of the car seems to know.
Anyway, I'm letting the car stay off for a longer duration to see if it comes back.
1. Turn the car's ignition to ON or leave the engine running.
2. Press and hold down the center Audio Power / Volume knob.
3. Keep holding it for roughly 10 to 15 seconds.
4. The screen will go entirely black. Do not let go yet.
5. Release the button only when you see the Nissan logo reappear on the display.