I am intrested in adding XM to my HHR, but really dont want to add the aftermarket stuff. Is there anyway I can add XM to the exiting radio signal????

 

I am thinking all you should have to do is subscribe. My radio is xm ready, but check it out with your saleman.

 

If you bought your ride (new) with XM, you would know it, you would`ve gotten (3) months free trial and you would have an antenna on the roof near the rear window washer sprayer. So if you didn`t get that, then your ride doesn`t have the XM converter or whatever they call it, you`ll need that or some sort of aftermarket receiver you would probably plug into the i-pod/aux. socket on the face.
This is all assuming you bought your ride new.
Heck, someone on this site may have one for sale...I think I saw where someone took theirs out, wanted Sirrius... B/B

 

Talk to your dealer. GM makes a XM add-on for radios that are XM-ready. And it will work just like factory installed.