and what kind of tuner is it?
i assume its separate from the radio/fm modulated, not xm ready

if its like one of the sony xm receivers from a couple years ago or something else they dont make anymore ur better off gettin a new one, cuz the only 2 companies that make xm receivers now are delphi and terk.

and if the tuner box is the problem, and you dont wanna replace ur whole system, hurry up and find one fast online or somewhere cuz within a lil while u wont be able to find em at all. alpine is the first to do it, they build the xm tuner into the head unit so all you need is the antenna. other companies will be soon to follow.