2008 GMC Acadia Owner's Manual - Page 256

Loading XM: The audio system is acquiring and processing audio and text data. No action is needed. This message should disappear shortly. Channel Off Air: This channel is not currently in service. Tune to another channel. Channel Unavail: This previously assigned channel is no longer assigned. Tune to another station. If this station was one of the presets, choose another station for that preset button. No Artist Info: No artist information is available at this time on this channel. The system is working properly. 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. 3-114