GMC 2009 Sierra - Manual (Page 244)

No Title Info: No song title information is available at
this time on this channel. The system is working
properly.
No CAT Info: No category information is available at
this time on this channel. The system is working
properly.
No Information: No text or informational messages are
available at this time on this channel. The system is
working properly.
CAT Not Found: There are no channels available for
the selected category. The system is working properly.
XM TheftLocked: The XM receiver in the vehicle
could have previously been in another vehicle.
For security purposes, XM™ receivers cannot be
swapped between vehicles. If this message appears
after having your vehicle serviced, check with your
dealer/retailer.
XM Radio ID: If tuned to channel 0, this message
alternates with the XM Radio eight digit radio ID label.
This label is needed to activate the service.
Unknown: If this message is received when tuned to
channel 0, there could be a receiver fault. Consult
with your dealer/retailer.
Check XM Receivr: If this message does not clear
within a short period of time, the receiver could have a
fault. Consult with your dealer/retailer.
XM Not Available: If this message does not clear
within a short period of time, the receiver could have a
fault. Consult with your dealer/retailer.
Navigation/Radio System
Your vehicle may have a navigation radio system.
The navigation system has built-in features intended to
minimize driver distraction. Technology alone, no
matter how advanced, can never replace your own
judgment. See the Navigation System manual for some
tips to help you reduce distractions while driving.
3-108