Ours is as bad OR worse, we get a gray & grayer picture from all 3 cameras.
I'm in the middle of figuring out way. We have a Pioneer AVH-P1400DVD, not sure if it's oem.
I'm finding a few 1080P wireless and 1 wired
but so far they all have a stand alone display, not interested in these
yet.
https://www.amazon.com/Fookoo-Wirele...1172771&sr=8-3
Another option is to change the head unit and cameras, lots of those with navigation.
Research continues.