The Sirius radio on a CPO 2008 Mercedes worked at time of purchase. Despite intermittent outages, it worked for a year or so. Then, as Sirius software was updated, service was lost. Newer software extednded the channel coverage beyond the capabilities of the original radio. From that point on, the unit rarely worked. Sirius technicians repeatedly referred us to the Mercedes dealer. The Dealer said they could do nothing but install a new usit that we would have to purchase. Sirius technicians said 'not our fault'...Mercedes technicians said 'not our fault'...we continued paying the Sirius charges. On finally giving up and decideing to cancel the Sirius service, I was informed that no credit could be given for the months and months we patiently worked with their technicians to resolve the problem. During this entire episode, the radio DID sometime work...proving that the unit was capable ot receiving a signel and performing properly. The problem clearly lies with the SiriusXM software and signal.
Avoid SiriusXM...use USB's, memory sticks, and broadcast radio to avoid this type of frustration.