I was wondering how your unit works with the Phatbox. I also have a Phatbox in my Audi A4 1.8T 2002 (Non-Bose) and no one has given me a clear answer if it will work with the Phatbox. Please let me know how it works and if you also see the graphics on the screen.
It works perfectly fine! You'll need make sure the ground wire is connected at the head unit because some or most of the pre-made wiring harnesses are not using the correct ground wire for the CD changer.
No the graphics do not show up on the screen. I will read CD 1 or Track 1, etc.