I have a Z110BT with the 120 upgrade and it has been working perfectly since in installed it two weeks ago. Yesterday, as it was playing music from my ipod, everything froze. I turned the unit off and tried to start it again. I got a gray screen and a message: Caution: Screen image may appear reversed. None of my controls work except for selecting/playing the programed radio stations and volume up and down. It is installed on a 2001 Audi S4 with the factory Bose system. I had performed the mods necessary as suggested by the Audi Forums. I think that it is wired correctly because it worked fine for two weeks. Any help will be greatly appreciated. Thank you.

I had the same problem with my unit. Check the wiring for the camera. I didn't have the ground grounded properly. It could also be the reverse wire is not connected properly.

Hope this helps.

Thanks, I'll check that out. I don't have the camera. Does that make a difference in wiring?

Problems with the camera likely would not cause what you are describing. You need to check your connections to the unit. it also may be defective.

Fixed! After talking to Pioneer, I was able to get it to work by unplugging the power to the unit. Waited for a half-hour, replugged unit and voila--it worked. Because the screen and all the buttons were frozen, the normal way to reset was not possible. Thanks for the input.