2008 GMC Sierra 1500 Pickup Owner's 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