Ok, I have a 2011 XJ, and on my way home from dinner, the Nav/Climate/Audio screen is on, but blank (white). I turned the car off, and restarted, and it stayed on the entire time. I have parked it in the garage, and ensured the key is away from it, and it is still on. Has anyone heard of this before?

 

I disconnected the battery for 5 min, and reconnected, and it fixed the problem. Hope that isn't a frequent need.