Interesting. I would think that simply turning the radio off would kill power to the modules, but apparently not. Thanks for passing on the warning!
My Sirius module is going bad as well, but in my case, it fails to be seen by the JVC in-dash unit. There is a chain of modules - Bluetooth, Sirius, and iPad. In my case, the Sirius was first in the chain, and that prevent the others (BT in particular) from being seen. I changed the order to put the BT first, then Sirius. The iPod must be last since it doesn't have a daisy chain output port. BT is solid now, and on occasion the Sirius also works. Really sounds good when they happen to have a free preview going (like now), but not worth paying $$$ for it. I also don't have an iPod, so don't care about that port.