We need more info such as model # of the radio (as PO may have put a different h/u in). Anyhow, I can't speak specifically to the Traffic Pro model but you might want to check a few things.
The first Traffic Pro h/u is similar to the CDR-220 and looks like this:
-try removing the faceplate (pushing the CD eject button on h/u) and cleaning the contacts (w/ a pencil eraser or q-tip & rubbing alcohol)
- CDR-220 also has a second fuse on back of the head unit. TP might too? If you have a set of the radio keys, pull the h/u out and look. If not, you can see if a local stereo shop will let you borrow their keys (same as VW/Audi keys and look like this:
Finally, here's a link to the manual for the Traffic Pro and it mentions something about a software reset on P44.
Manual Here
Good luck and hope this helps
