2002 GMC SONOMA radio

3-36
Setting the Tone (Bass/Treble)
AUDIO: Press and release the AUDIO knob until
BASS or TREB appears on the display. Turn the knob
clockwise or counterclockwise to increase or decrease.
The display will show the bass or treble level. If a
station is weak or noisy, you may want to decrease
the treble.
To adjust the bass and treble to the middle position, push
and hold the AUDIO knob. 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 when no tone
or speaker control is displayed. The radio will produce
one beep and display ALL with the level display in the
middle position.
AUTO TONE: This feature allows you to choose
bass and treble equalization settings designed for
country/western, jazz, talk, pop, rock and
classical stations.
Each time you press the AUTO TONE button, this
feature will switch to one of these program types.
To return the bass and treble to the manual mode, press
and release the AUDIO knob.Adjusting the Speakers (Balance/Fade)
AUDIO: To adjust the balance to the right and left
speakers, push and release the AUDIO knob until BAL
appears on the display. Turn the knob clockwise to move
the sound to the right speakers and counterclockwise to
move the sound to the left speakers.
To adjust the fade to the front and rear speakers, push
and release the AUDIO knob until FADE appears on the
display. Turn the knob clockwise to move the sound to
the front speakers and counterclockwise to move the
sound to the rear speakers.
To adjust the balance and fade to the middle position,
push the AUDIO knob then push it again and hold it
until the radio produces one beep. The balance and fade
will be adjusted to the middle position and the display
will show the speaker balance.
To adjust all tone and speaker controls to the middle
position, push and hold the AUDIO knob when no tone
or speaker control is displayed. The radio will produce
one beep and display ALL with the level display in the
middle position.

3-37
Using RDS
Your audio system is equipped with a Radio Data
System (RDS). RDS is a system that receives 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, the radio can do
the following:

Seek only to stations with the types of programs you
want to listen to,

seek to stations with traffic announcements,

receive announcements concerning local and
national emergencies, and

receive and display messages from radio stations.
RDS features are only available on FM stations that
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, 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.
Finding RDS Stations
To find RDS stations perform the following steps:
1. Push the SEEK TYPE button or turn the P
-TYPE
LIST knob to display the program type list.
2. Turn the knob either clockwise or counterclockwise
to select a program type. The list is alphabetical. If
you select ANY TYPE your radio will seek to the
first PTY available.
3. Push the SEEK TYPE button to activate search.
VOL (Volume): Turn this knob clockwise to increase
volume when RDS interrupts regular play. Turn it
counterclockwise to decrease volume.
DISP (Display): Press this knob to change what appears
on the display while using RDS. Pressing this knob 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 knob
will activate the RDS default display.

3-38
Finding a PTY Preset Station
P
-TYPE LIST (Program Type): Turn this knob
clockwise or counterclockwise to select the Program
Type (PTY) you want to listen to. TYPE and a PTY will
appear on the display. Press the SEEK TYPE button and
the radio will seek to the first RDS broadcaster of the
selected program type. If the radio cannot find the
desired program type, NONE will appear on the display
and the radio will return to the last station you were
listening to.
AM FM (Alternate Frequency): Alternate frequency
allows the radio to switch to a stronger station with the
same program type. Press and hold AM FM for
two seconds to turn alternate frequency on. AF ON will
appear on the display. The radio may switch to stronger
stations. Press and hold AM FM again for two seconds
to turn alternate frequency off. AF OFF will appear on
the display. The radio will not switch to other stations.
When you turn the ignition off and then on again,
the alternate frequency feature will automatically be
turned on.SEEK TYPE: Press this button to go to a station with
the last selected PTY; TYPE and the last selected PTY
will appear on the display, if it is not already showing.
Press SEEK TYPE a second time to seek. If a station
with the selected PTY is not found, the radio will return
to the original station and display NONE.
RDS Messages
ALERT: Alert warns of national or local emergencies.
You will not be able to turn off alert announcements.
ALERT! appears on the display when an alert
announcement plays. When an alert announcement
comes on the current radio station, you will hear it, even
if the volume is muted or a cassette tape or compact disc
is playing. If the cassette tape or compact disc player is
playing, play will stop for the announcement and resume
when the announcement is finished.
This function will only work during actual emergency
broadcasts, and will not work during tests of the
emergency broadcast system. This feature is not
supported by all RDS stations.

3-39
INFO (Information): If the current station has a
message, the information icon will appear on the
display. These text messages are from the RDS
broadcaster to the listening public and may be general
information such as artist and song title, call in phone
numbers, etc. Press this button to see the message. If the
whole message does not appear on the display, parts of
the message will appear every three seconds until the
message is completed. To scroll through the message at
your own speed, press the INFO button again for less
than one second. A new group of words will appear on
the display. Once the complete message has been
displayed, the information icon will disappear from the
display until another new message is received. The old
message can be displayed by pressing the INFO button
until a new message is received or a different station is
tuned to.
TRAF (Traffic): Press this button to receive traffic
announcements. If the current station does not broadcast
traffic announcements, the radio will seek to a station
that does. The traffic symbol will flash on the display.
When the radio finds a station that broadcasts traffic
announcements, it will stop. If no station is found, NO
TRAF will appear on the display.Your radio can be programmed to interrupt the playback
of a cassette tape, CD or FM radio by enabling the
traffic interrupt feature. Press the TRAF button once to
seek to an RDS station that supports the traffic interrupt
feature if the current station does not. The traffic symbol
will flash on the display when seeking for a station that
supports traffic interrupt. When the traffic interrupt
feature is on, TRAF will appear on the display.
When a traffic announcement comes on the current radio
station, you will hear it, even if the volume is muted or a
cassette tape or compact disc is playing. The traffic
symbol and TRAFFIC will appear on the display while
the traffic announcement plays. If the cassette tape or
compact disc player was being used, the tape or compact
disc will stay in the player and resume play at the point
where it stopped.
Radio Messages
CAL ERR (Calibration Error): This message is
displayed when the radio has not been calibrated
properly for the vehicle. You must return to the
dealership for service.
LOCKED: This message is displayed when the
THEFTLOCK

system has locked up. You must return
to the dealership for service.

3-40
Playing a Cassette Tape
Your tape player is built to work best with tapes that are
up to 30 to 45 minutes long on each side. Tapes longer
than that are so thin they may not work well in this
player. The longer side with the tape visible should face
to the right. If the ignition is on, but the radio is off, the
tape can be inserted and will begin playing. A tape
symbol is shown on the display whenever a tape is
inserted. If you hear nothing but a garbled sound, the
tape may not be in squarely. Press EJT to remove the
tape and start over.
While the tape is playing, use the VOL, AUDIO and
SEEK controls just as you do for the radio. The display
will show TAPE and an arrow showing which side of
the tape is playing.
If you want to insert a tape when the ignition is off, first
press EJT or DISP.
If an error appears on the display, see ªCassette Tape
Messagesº later in this section.1 PREV (Previous): Press this pushbutton to go to the
previous selection on the tape if the selection has been
playing for less than three seconds. If this pushbutton is
pressed and the current selection has been playing for
more than 13 seconds, it will go to the beginning of the
current selection. If this pushbutton is pressed and the
current selection has been playing from 3 to 13 seconds,
it will go to the beginning of the previous selection or
the beginning of the current selection, depending upon
the position on the tape. SEEK and a
-1 will appear on
the display while the cassette player is in the previous
mode. If this pushbutton is pressed additional times or
held, the radio will go to the displayed number of
previous selections up to 9. SEEK and a negative
number will appear on the display. Your tape must
have at least three seconds of silence between each
selection for previous to work. The sound will mute
while seeking.
2 NEXT: Press this pushbutton to go to the next
selection on the tape. If you press the pushbutton more
than once, the player will continue moving forward
through the tape. SEEK and a positive number will
appear on the display. Your tape must have at least
three seconds of silence between each selection for next
to work. The sound will mute while seeking.

3-41
3 REV (Reverse): Press this pushbutton to reverse the
tape rapidly. Press it again to return to playing speed.
The radio will play the last selected station while the
tape reverses. The station frequency and REV will
appear on the display. You may select stations during
reverse operation by using the TUNE, DISP and SEEK.
4 FWD (Forward): Press this pushbutton to advance
quickly to another part of the tape. Press this pushbutton
again to return to playing speed. The radio will play the
last selected station while the tape advances. The station
frequency and FWD will appear on the display. You
may select stations during forward operation by using
TUNE DISP and SEEK.
5 SIDE: Press this pushbutton to play the other side of
the tape.
6
(Dolby): Press this pushbutton to reduce
background noise. NR ON will appear on the display.
Press it again to turn Dolby NR off. NR OFF will appear
on the display.
Dolby Noise Reduction is manufactured under a license
from Dolby Laboratories Licensing Corporation. Dolby
and the double
-D symbol are trademarks of Dolby
Laboratories Licensing Corporation.
 SEEK
: The right arrow is the same as the NEXT
pushbutton, and the left arrow is the same as the PREV
pushbutton. If the arrow is held or pressed more than
once, the player will continue moving forward or
backward through the tape. SEEK and a positive or
negative number will appear on the display.
AM FM: Press this button to listen to the radio
when a tape is playing. The tape will stop but remain
in the player.
TAPE CD: Press this button to play a tape when
listening to the radio. Press this button to switch
between the tape and compact disc if both are loaded.
The inactive tape or CD will remain safely inside the
radio for future listening.
EJT (Eject): Press this button to stop a tape
when it is playing or to eject a tape when it is not
playing. Eject may be activated with the radio off.
Cassette tapes may be loaded with the radio off if this
button is pressed first.

3-42
Cassette Tape Messages
CHK TAPE (Check Tape): If CHK TAPE appears on
the radio display, the tape won't play because of one of
the following errors.

The tape is tight and the player can't turn the tape
hubs. Remove the tape. Hold the tape with the open
end down and try to turn the right hub
counterclockwise with a pencil. Turn the tape over
and repeat. If the hubs do not turn easily, your tape
may be damaged and should not be used in the
player. Try a new tape to make sure your player is
working properly.

The tape is broken. Try a new tape.

The tape is wrapped around the tape head. Attempt
to get the cassette out. Try a new tape.
CLEAN: If this message appears on the display, the
cassette tape player needs to be cleaned. It will still play
tapes, but you should clean it as soon as possible to
prevent damage to the tapes and player. See ªCare of
Your Cassette Tape Playerº in the Index.
If any error occurs repeatedly or if an error can't be
corrected, contact your dealer.Playing a Compact Disc
Insert a disc partway into the slot, label side up. The
player will pull it in and the disc should begin playing.
The display will show the CD symbol. If you want to
insert a compact disc with the ignition off, first press
DISP or EJT.
If an error appears on the display, see ªCompact Disc
Messagesº later in this section.
1 PREV (Previous): Press this pushbutton to go to the
previous track if the current track has been playing for
less than eight seconds. If this pushbutton is pressed and
the current track has been playing for more than eight
seconds, it will go to the beginning of the current track.
TRACK and the track number will appear on the
display. If you hold this pushbutton or press it more than
once, the player will continue moving back through the
disc. The sound will mute while seeking.
2 NEXT: Press this pushbutton to go to the next track.
TRACK and the track number will appear on the
display. If you hold this pushbutton or press it more than
once, the player will continue moving forward through
the disc. The sound will mute while seeking.

3-43
3 REV (Reverse): Press and hold this pushbutton to
reverse quickly within a track. Press and hold this
pushbutton for less than two seconds to reverse at
six times the normal playing speed. Press and hold it for
more than two seconds to reverse at 17 times the normal
playing speed. Release it to play the passage. The
display will show ET and the elapsed time.
4 FWD (Forward): Press and hold this pushbutton to
advance quickly within a track. Press and hold this
pushbutton for less than two seconds to advance at
six times the normal playing speed. Press and hold it for
more than two seconds to advance at 17 times the
normal playing speed. Release it to play the passage.
The display will show ET and the elapsed time.
6 RDM (Random): Press this pushbutton to hear the
tracks in random, rather than sequential, order. RDM
ON will appear on the display. RDM T and the track
number will appear on the display when each track starts
to play. Press this pushbutton again to turn off random
play. RDM OFF will appear on the display.
 SEEK
: Press the left arrow to go to the start of the
current or previous track. Press the right arrow to go to
the start of the next track. If either of the arrows is held
or pressed more then once, the player will continue
moving backward or forward through the CD.DISP (Display): Press this knob to see how long the
current track has been playing. ET and the elapsed time
will appear on the display. To change what is normally
shown on the display (track or elapsed time), press the
knob until you see the display you want, then hold the
knob for two seconds. The radio will produce one beep.
AM FM: Press this button to listen to the radio
when a CD is playing. The CD will stop but remain in
the player.
TAPE CD: Press this button to play a tape when
listening to the radio. Press this button to switch
between the tape and compact disc if both are loaded.
The inactive tape or CD will remain safely inside the
radio for future listening.
EJT (Eject): Press this button to stop a CD when it
is playing or to eject a CD when it is not playing. Eject
may be activated with either the ignition or radio off.
CDs may be loaded with the radio and ignition off if this
button is pressed first.