GMC 2006 Savana Owner's Manual page 184

Adjusting the Speakers (Balance/Fade)
AUDIO: To adjust the balance between the right
and the left speakers, push and release the AUDIO
knob until BAL appears on the display. Turn the knob to
move the sound toward the right or the left speakers.
To adjust the fade between the front and rear speakers,
push and release the AUDIO knob until FAD appears
on the display. Turn the knob to move the sound toward
the front or the rear speakers.
The fade feature may not be available on all radio
systems.
To adjust the balance or fade to the middle position,
push and hold the AUDIO knob while BAL or FAD
is displayed. The radio will produce one beep and adjust
the display level to the middle position.
To adjust all tone and speaker controls to the middle
position, push and hold the AUDIO knob while no tone
or speaker controls are displayed. ALL CENTERED
will appear on the display and you will hear a beep.
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Radio Data System (RDS)
The audio system has a Radio Data System (RDS).
RDS features are available for use only on FM stations
that broadcast RDS information.
With RDS, the radio can do the following:
•
Seek to stations broadcasting the selected type of
programming
•
Receive announcements concerning local and
national emergencies
•
Display messages from radio stations
This system relies upon receiving specific information
from these stations and will only work when the
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,
contact the radio station.
While the radio is tuned to an RDS station, the station
name or call letters will appear on the display instead of
the frequency. RDS stations may also provide the
time of day, a program type (PTY) for current
programming, and the name of the program being
broadcast.