Hummer 2003 H2 Owner's Manual page 216

Adjusting the Speakers (Balance/Fade)
AUDIO: To adjust the balance between the right and the
left speakers, push the AUDIO knob until BAL appears
on the display. Turn the knob to move the sound toward
the left or the right speakers.
To adjust the fade between the front and the rear
speakers, push and hold the AUDIO knob until FAD
appears on the display. Turn the knob to move the sound
toward the front or the rear speakers.
To adjust the balance and fade to the middle position,
select balance or fade and push and hold the AUDIO
knob. The radio will beep once and will 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 when tone
or speaker controls are not displayed. The radio will
produce one beep and CENTERED will appear on
the display.
3-24
Using RDS
Your audio system is equipped with a Radio Data
System (RDS). RDS features are available for use
only on FM stations that broadcast RDS information.
Using this system, the radio can do the following:
D
Seek to stations broadcasting the selected type
of programming,
D
receive announcements concerning local and
national emergencies,
D
display messages from radio stations, and
D
seek to stations with traffic announcements.
This system relies upon receiving specific information
from these stations and will work only 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 you are tuned to an RDS station, the station name
or the 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.