GMC 2002 Envoy Owner's Manual page 191

The middle position balances the sound between the
speakers. To set the fade to the middle position, press
-
the P TYPE LIST AUDIO control briefly, then press it
again and hold it until the radio emits one beep. The
fade will be set to the middle position and the display
will show the speaker balance.
To set all tone and speaker controls to the middle
position, press and hold the P
control when no tone or speaker control is active. The
radio will produce one beep and display ALL with the
level display in the middle position.
Using RDS
Your audio system is equipped with a Radio Data
System (RDS). RDS is a system that sends data along
with the audio of the FM station you are currently tuned
to. You can use RDS to display program information
and to control your radio. With RDS your radio can do
the following:
D
Seek only to stations with the types of programs you
want to listen to,
D
seek to stations with traffic announcements,
D
receive announcements concerning local and
national emergencies, and
D
receive and display messages from radio stations.
-
TYPE LIST AUDIO
RDS features are only available on FM stations which
broadcast RDS information. The RDS features of your
radio rely on receiving specific RDS information from
these stations. These features will only work when the
RDS information is available. In rare cases, a radio
station may broadcast incorrect information that will
cause the radio features to work improperly. If this
happens, please contact the radio station.
When you are tuned to an RDS station, the station name
will appear on the display, instead of the frequency.
Most RDS stations provide their station name, the time
of day and a Program Type (PTY) for their current
programming. Some stations also provide the name of
the current program.
TUNE DISP: Press this control to change what appears
on the display while using RDS. Pressing this control
will also display an RDS station frequency or program
type when the radio is on. The display options are
station name, station frequency, PTY and the name of
the program (if available). Pressing and holding this
control will activate the RDS default display.
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