More good suggestions. When booting up, I did see it flash thru something like "Starting Radio Module". It did so even without it docked (and thus without the tuner module). But I don't see a "Radio" option in the menus.

As for bad connections, I am using the extension, but I tried BOTH tuners and extensions cables I bought. Thus, unless I got 2 bad cables or modules, that shouldn't be the problem. It still could be the one on the sled, but I don't see anything wrong with it. All the connections appear good.

I guess it's beginning to sound like either I have a bad sled or a bad Empeg. I don't want to try installing in the other car until I get this figured out. So, I may end up sending it back. (I guess I'll get the HD upgrade done as well while back at its birthplace.)

Hugo, were there any other "tell-tale" signs of the problem you mentioned in your post? I wonder if my unit also can't recognize the tuner module.