GMC 2007 Sierra 1500 Pickup Owner's Manual page 306

Playing the Radio
PWR (Power): Press this knob to turn the system
on and off.
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VOL (Volume): Turn this knob to increase
or to decrease the volume.
INFO (Information): When the ignition is off,
press this knob to display the time.
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 display you want, then
hold the knob until the display flashes. The
selected display will now be the default.
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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 LOW, MEDIUM, or HIGH. AVOL
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 AVOL OFF appears on the
display.
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.