I bought a used 2005 Ford Explorer with Sirius factory installed. I listened to Sirius on the old owner's account for awhile, but it has now expired. I have a Sirius account myself, so I tried to add this receiver to my account, but I need the ESN #. Since the previous account has been deactivated, I can not get any Sirius channels (therefore can't see the channel that displays ESN). I have tried many combinations of buttons suggested to me (1 and 6, SAT and 1, Eject and Time) none worked. The Ford dealer pulled the radio out and looked at the back...no number. Does anyone have any ideas on how to find the ESN? I have also contacted the used car dealer to see if they could contact the previous owner as a last resort. Thanks.