GMC Envoy Owner's Manual page 219

Radio Display
Message
XL (Explicit Language
Channels)
Updating
No Signal
Loading
Off Air
CH Unavl
No Info
No Info
3-84
XM™ Radio Messages
Condition
XL on the radio display,
after the channel name,
indicates content with
explicit language.
Updating
encryption code
Loss of signal
Acquiring channel audio
(after 4 second delay)
Channel not in service
Channel no longer
available
Artist Name/Feature not
available
Song/Program Title not
available
Action Required
These channels, or any others, can be blocked at a
customer's request, by calling 1-800-852-XMXM (9696).
The encryption code in the receiver is being updated, and
no action is required. This process should take no longer
than 30 seconds.
The system is functioning correctly, but the vehicle is in a
location that is blocking the XM signal. When the vehicle is
moved into an open area, the signal should return.
The 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 the
presets, choose another station for that preset button.
No artist information is available at this time on this
channel. The system is working properly.
No song title information is available at this time on this
channel. The system is working properly.