2003 GMC Sierra 1500 Pickup Owner's Manual - Page 233

XMTMRadio Messages Radio Display Message ~ Condition ~ ~~ ~ Action Required ~~ ~~ XL (Explicit Language Channels) XL onthe radio display, after the channel name, indicates content with explicit language. Updating encryption code Loss of signal These channels, or~any others, can be blocked at acustomer'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. 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 song title information is available at this time on this channel. Your system is working properly. No Signal Loading XM Acquiring channel audio (after 4 second delay) Channel not in service Channel no longer available CH Off Air CH Unavail No Info Artist Name/Feature not available Song/Program Title not available No Info 3-78