How does XM talk to my car?
October 2, 2009 7:45 AM Subscribe
How would XM stop my radio from working when my trial offer expires?
posted by mpls2 to Technology (9 answers total)
I bought a new car that came with a 3 month trial subscription to XM radio. I actually like it and plan on continuing the subscription, but I was wondering how they could stop my radio from working, or re-enable it if I later decided to subscribe, since they really have no way of talking directly to my radio (cuz my radio can't talk back to their satellites).
I assume they do something like periodically broadcast lists of valid/invalid radio IDs.
Anybody know any more details?