2003 GMC Sierra 1500 Pickup Owner's Manual - Page 259

XMTMRadio Messaqes Radio Display Messaae " XL (Explicit Language Channels) I Condition XL on the radio display, after the channel name, indicates content with explicit language. Updating encryption code Loss of signal Action Required These channels, or any others, can be blocked at a customer's request, by calling 1-800-852-XMXM (9696). Updating The encryption code in your receiver is being updated, and no action is required. This process should take no longer than 30 seconds. Your system is functioning correctly, but you are in a location that is blocking the XM signal. When you move into an open area, the signal should return. Your radio system is acquiring and processing audio and text data. No action is needed. This message should disappear shortly. ~ No Signal Loading XM Acquiring channel audio (after 4 second delay) CH Off Air CH Unavail I Channel not in service Channel no longer available This channel is not currently in service. Tune to another channel. This previously assigned channel is no longer assigned. Tune to another station. If this station was one of your presets, you may need to choose another station for that preset button. No artist information is available at this time on this channel. Your system is working properly. No Info No Info Artist Name/Feature not available Song/Program Title not available No song title information is available at this time on this channel. Your system is working properly. 3- 104