2004 Buick Rendezvous Owner's Manual - Page 246

XM™ Radio Messages (cont'd) Radio Display Message XM Locked Condition Theft lock active Action Required The XM receiver in your vehicle may have previously been in another vehicle. For security purposes, XM receivers cannot be swapped between vehicles. If you receive this message after having your vehicle serviced, check with the servicing facility. 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. Radio ID Radio ID label (channel 0) Radio ID not known (should only be if hardware failure) Hardware failure Unknown Chk XMRcvr 3-106