2004 Buick Rendezvous Owner's Manual - Page 222

XM™ Radio Messages (cont'd) Radio Display Message Radio ID Condition Radio ID label (channel 0) Radio ID not known (should only be if hardware failure) Hardware failure Action Required If you tune to channel 0, you will see this message alternating with your XM Radio 8 digit radio ID label. This label is needed to activate your service. If you receive this message when you tune to channel 0, you may have a receiver fault. Consult with your dealer. If this message does not clear within a short period of time, your receiver may have a fault. Consult with your retail location. Unknown Chk XMRcvr 3-82