Since I added an aftermarket stereo to my car, the center display hasn't been displaying. The issue is the Prius expects the stock stereo to be plugged in, and if it doesn't see it, then it turns off certain features for the display. It still worked as a backup camera, but that's it.
The fix was pretty simple, just add a 68 ohm resister between two wires on the stock stereo 20 pin connector.
Done! I have the full display back. And I made a point of driving a bit this afternoon to make sure the car wasn't going to suddenly burst into flame. All is well.