Cadillac 2005 XLR Owner's Manual page 254

Radio Display Message Condition
Not Found
No Information
XM Theftlocked
XM Radio ID
Unknown
Check XM Receivr
4-60
No channel available for
the chosen category
No Text/Informational
message available
Theft lock active
Radio ID label
(channel 0)
Radio ID not known
(should only be if
hardware failure)
Hardware failure
Action Required
There are no channels available for the category you
selected. Your system is working properly.
No text or informational messages are available at this time
on this channel. Your system is working properly.
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.