GMC 2008 Savana Van Owner's Manual page 182

Radio with CD (MP3) shown,
Radio with Six-Disc CD (MP3) similar
Your vehicle has one of these radios as its audio system.
Radio Data System (RDS)
Your Radio may have a Radio Data System (RDS).
The RDS feature is available for use only on 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.
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Playing the Radio
O
(Power/Volume): Press to turn the system on
and off.
Turn clockwise or counterclockwise to increase or
decrease the volume.
When the radio is turned on, it plays at the volume level
that was last set. The volume can be adjusted using
this knob.
4
(Information) (AM-FM Radio and Radio with CD
(Base)): Press to switch the display between the radio
station frequency and the time. While the ignition is off,
press to display the time.
4
(Information) (MP3 and RDS Features): Press to
display additional text information related to the current
FM-RDS station or MP3 song. A choice of additional
information such as: Channel, Song, Artist, and CAT
(category) can display. Continue pressing to highlight the
desired label, or press the pushbutton positioned under
any one of the labels and the information about that label
displays.
When information is not available, No Info displays.