GMC 2010 Sierra 1500 Crew Cab Owner's Manual page 314

For radios with the Radio Data System (RDS) feature,
it only works with FM stations that broadcast RDS
information. This system relies upon receiving specific
information from these stations and only works when
the information is available. While the radio is tuned to
an FM-RDS station, the station name or call letters
displays. In rare cases, a radio station could broadcast
incorrect information that causes the radio features to
work improperly. If this happens, contact the radio
station.
Press to turn the system on
and off.
Turn clockwise or counterclockwise to increase or
decrease the volume.
display between the radio station frequency and the
time. While the ignition is off, press this button to
display the time.
4-90
Press to switch the
Speed Compensated Volume (SCV) automatically
adjusts the radio volume to compensate for road and
wind noise as the vehicle's speed changes while
driving, so that the volume level stays consistent.
To activate SCV:
1. Set the radio volume to the desired level.
2. Press the MENU button to display the radio
setup menu.
3. Press the softkey under the AUTO VOLUM
(automatic volume) tab on the radio display.
4. Press the softkey under the desired Speed
Compensated Volume setting (OFF, Low, Med,
or High) to select the level of radio volume
compensation. The display times out after
approximately 10 seconds. Each higher setting
allows for more radio volume compensation at
faster vehicle speeds.
Radios with