Buick 2009 Lucerne - Manual (Page 223)

Radio(s)
The vehicle has one of these radios as its audio
system.
Radio Data System (RDS)
The radio may have the Radio Data System (RDS)
feature. RDS 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 display. In rare cases, a radio station
can broadcast incorrect information that causes the radio
features to work improperly. If this happens, contact
the radio station.
Playing the Radio
O (Power/Volume): Press to turn the system
on and off.
Turn clockwise or counterclockwise to increase or
decrease the volume.
The radio goes to the previous volume setting when the
radio is turned on. The volume can still be adjusted
by using the volume knob.
Radio with CD (MP3) shown,
Radio with Six-Disc CD (MP3) similar
3-83