GMC 2007 Sierra 1500 Pickup Owner's Manual page 320

For RDS, press the INFO knob to change what
appears on the display while using RDS. The
display options are station name, RDS station
frequency, PTY, and the name of the program
(if available).
For XM™ (if equipped), press the INFO knob
while in XM™ mode to retrieve four different
categories of information related to the current
song or channel: Artist, Song Title, Category
or PTY, Channel Number/Channel Name.
To change the default on the display, press the
INFO knob until you see the desired display, then
hold the knob until you hear a beep. The
selected display will now be the default.
AUTO VOL (Automatic Volume): With automatic
volume, the audio system will adjust automatically
to make up for road and wind noise as you drive by
increasing the volume as vehicle speed increases.
Set the volume at the desired level. Press this
button to select MIN (minimum), MED (medium), or
MAX (maximum). AUTO VOL will appear on the
display. Each higher setting will provide more
volume compensation at faster vehicle speeds. To
turn automatic volume off, press this button until
AUTO VOL OFF appears on the display.
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Finding a Station
BAND: Press this button to switch between FM1,
FM2, AM, or XM1 or XM2 (if equipped). The
display will show the selection.
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TUNE : Turn this knob to select radio
stations.
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SEEK : Press either the SEEK or the TYPE
arrows to go to the next or to the previous
station and stay there.
The radio will only seek stations with a strong
signal that are in the selected band.
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SCAN : Press and hold either the SCAN or
the TYPE arrows for two seconds until SCN
appears on the display and you hear a beep. The
radio will go to a station, play for a few seconds,
then go on to the next station. Press either the
SCAN or the TYPE arrows again to stop scanning.