I guess this like the others; my XM works fine, I can hop channels and get my radio ID off channel 000. I'm almost POSITIVE it was working on the bench a few days ago- I checked it out before I took everything apart to install, and wrote my radio ID on a little piece of paper. I've got the black /black /out on my 920 (not the traffic unit) to blue/blue/in in on my Z1 (Aug 06). There is another, bigger plug-in on the back; manual says that's for TV tuner in, so I'm not messing with it.

Try resetting the unit. There's a little hole on the side of the GEX-P920XM with a button in it. Also, make sure your antenna is working properly.

Done. No change... I guess the antenna works; I get music.

Freaky. Did you try resetting the Z1?

Yes- a couple of times.

You may have a defective XM tuner. Can you try another one or try using it on another head unit? Try another IPbus cable, if you have one.

Well, if it's defective, it's still 99.9% effective, in my opinion. I have though about the cable, I'll hop over to Ebay and see if I can dig one up. But why would others have the same problem? Is it just the 920's that have this issue? What about people with 910's? What do they see?

Never heard of this issue, you may just have a bad IP-bus cable, your local retailers should have one....