2002 GMC SONOMA buttons

3-27
Finding a Station
AM FM: Press this button to switch between AM, FM1
and FM2. The display shows your selection.
TUNE: Turn this knob to choose radio stations.
SEEK : Press the right or left arrow to seek to the
next or previous station and stay there. The radio will
seek to stations with a strong signal only. The sound will
mute while seeking.
PSCAN (Preset Scan): Press and hold one of the
arrows for more than two seconds and the radio will
produce one beep. The radio will scan to the first preset
station stored on your pushbuttons, play for a few
seconds and flash the station frequency, then go on to
the next preset station. Press one of the arrows or one of
the pushbuttons again to stop scanning. SCAN will be
displayed whenever the tuner is in the preset scan mode.
The channel number (P1 through P6) will appear with
the frequency. In FM mode, this function will scan
through the current band such as FM1 or FM2. The
radio will scan preset stations with a strong signal only.
The sound will mute while scanning.Setting Preset Stations
The six numbered pushbuttons let you return to
your favorite stations. You can set up to 18 stations
(six AM, six FM1 and six FM2) by performing the
following steps:
1. Turn the radio on.
2. Press AM FM to select AM, FM1 or FM2.
3. Tune in the desired station.
4. Press AUTO TONE to choose the bass and treble
equalization that best suits the type of station you are
listening to.
5. Press and hold one of the six numbered pushbuttons.
The radio will produce one beep. Whenever you
press that numbered pushbutton, the station you set
will return and the bass and treble equalization that
you selected will also be automatically selected for
that pushbutton.
6. Repeat the steps for each pushbutton.

3-35
Finding a Station
AM FM: Press this button to switch between AM, FM1
and FM2. The display will show your selection.
 TUNE
: Turn this knob to choose radio stations.
 SEEK
: Press the right or left arrow to seek to the
next or previous station and stay there. The radio will
seek to stations with a strong signal only. The sound will
mute while seeking.
 PSCAN
(Preset Scan): Press and hold one of the
arrows for more than two seconds. The radio will
produce one beep. The radio will scan to the first preset
station stored on your pushbuttons, play for a few
seconds, then go on to the next station. Press one of the
arrows or one of the pushbuttons again to stop scanning.
SCAN will be displayed whenever the tuner is in the
preset scan mode. The channel number (P1 through P6)
will appear with the frequency. In FM mode, this
function will scan through the current band such as FM1
or FM2. The radio will scan to stations with a strong
signal only. The sound will mute while scanning.Setting Preset Stations
The six numbered pushbuttons let you return to
your favorite stations. You can set up to 18 stations
(six AM, six FM1 and six FM2) by performing the
following steps:
1. Turn the radio on.
2. Press AM FM to select AM, FM1 or FM2.
3. Tune in the desired station.
4. Press AUTO TONE to choose the bass and treble
equalization that best suits the type of station you are
listening to.
5. Press and hold one of the six numbered pushbuttons.
The radio will produce one beep. Whenever you
press that numbered pushbutton, the station you set
will return and the bass and treble equalization that
you selected will also be automatically selected for
that pushbutton.
6. Repeat the steps for each pushbutton.

3-45
AUTO VOL (Automatic Volume): Your system has a
feature called automatic volume. With this feature, your
audio system adjusts automatically to make up for road
and wind noise as you drive.
Set the volume at the desired level. Press this button to
select MIN, MED or MAX. Each higher choice allows
for more volume compensation at faster vehicle speeds.
Then, as you drive, automatic volume increases the
volume, as necessary, to overcome noise at any speed.
The volume level should always sound the same to you
as you drive. If you don't want to use automatic volume,
select OFF.
RCL (Recall): Push this knob to display the station
being played or to display the clock. Pushing this knob
with the ignition off will display the clock
Finding a Station
AM FM: Press this button to switch between AM, FM1
and FM2. The display shows your selection.
TUNE: Turn this knob to select radio stations.
SEEK : Press the right or left arrow to go to the
next or previous station and stay there. The sound will
mute while seeking.


SCAN : Press and hold either SCAN arrow for
two seconds until SC appears on the display and you
hear a beep. The radio will go to a station, play for a few
seconds, then go on to the next station. Press either
SCAN arrow again to stop scanning. If you press SCAN
for more than four seconds, the radio will change to
preset scan mode. The sound will mute while scanning.
To scan preset stations, press and hold either SCAN
arrow for more than four seconds, PRESET SCAN
will appear on the display. You will hear a double beep.
The radio will go to a preset station stored on your
pushbuttons, play for a few seconds, then go on to
the next preset station. Press either SCAN arrow
again to stop scanning presets. The sound will mute
while scanning.

3-46
Setting Preset Stations
The six numbered pushbuttons let you return to
your favorite stations. You can set up to 18 stations
(six AM, six FM1 and six FM2) by performing the
following steps:
1. Turn the radio on.
2. Press AM FM to select AM, FM1 or FM2.
3. Tune in the desired station.
4. Press AUTO EQ to select the equalization that best
suits the type of station selected.
5. Press and hold one of the six numbered pushbuttons
until you hear a beep. Whenever you press that
numbered pushbutton, the station you set will return
and the equalization that you selected will also be
automatically selected for that pushbutton.
6. Repeat the steps for each pushbutton.
Setting the Tone (Bass/Treble)
AUDIO: Push the AUDIO knob until BASS, MID or
TREB appears on the display. Turn the knob to increase
or decrease. When you use this knob, the radio's tone
setting will switch to custom. If a station is weak or
noisy, you may want to decrease the treble.To adjust bass, midrange or treble to the middle
position, select BASS, MID or TREB and push and hold
the AUDIO knob. The radio will produce one beep and
adjust the display level to zero.
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 CENTERED will appear on the display.
AUTO EQ (Automatic Equalization): This feature
allows you to choose preset bass, midrange and treble
equalization settings designed for country, jazz, talk,
pop, rock and classical program types.
The program type last chosen will appear on the display
when you first press AUTO EQ. Each time you press
this button, another program type will appear on the
display and AUTO EQ will switch to one of the preset
program types.
To return to the manual mode (CUSTOM), press the
AUTO EQ button until CUSTOM appears on the
display. Then you will be able to manually adjust the
bass, midrange and treble using the AUDIO knob.

3-48
Finding a PTY Station
P
-TYPE (Program Type): This button is used to turn
on and off Program Type (PTY) selections. PTY and the
light next to the button will turn on. The last selected
PTY will appear on the display for five seconds.
Turn the P
-TYPE knob to select the PTY you want to
listen to. Press the SEEK arrows to find radio stations
for the PTY you want to listen to. The last PTY selected
will be used for seek or scan modes. If a station with the
selected PTY is not found, NONE FOUND will appear
on the display. If both P
-TYPE and TRAF are on, the
radio will search for stations with traffic announcements
and the selected PTY.
To use the PTY interrupt feature, press and hold the
P
-TYPE button until you hear a beep on the PTY
you want to interrupt on. When you are listening to a
compact disc, the last selected RDS FM station will
interrupt play if that selected program type format is
broadcast.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.
Setting PTY Preset Stations
The six numbered pushbuttons let you return to your
favorite PTYs. These buttons have factory PTY presets.
You can set up to 12 PTYs (six FM1 and six FM2) by
performing the following steps:
1. Press AM FM to select FM1 or FM2.
2. Press P
-TYPE to activate program type mode.
3. Turn the P
-TYPE knob to select a PTY.
4. Press and hold one of the six numbered pushbuttons
until you hear a beep. Whenever you press that
numbered pushbutton, the PTY you set will return.
5. Repeat the steps for each pushbutton.

3-58 Theft-Deterrent Feature (If Equipped)
THEFTLOCK
is designed to discourage theft of your
radio. It works by using a secret code to disable all radio
functions whenever battery power is removed.
The THEFTLOCK feature for the radio may be used or
ignored. If ignored, the system plays normally and the
radio is not protected by the feature. If THEFTLOCK is
activated, your radio will not operate if stolen.
When THEFTLOCK is activated, the radio will display
LOC to indicate a locked condition anytime battery
power has been interrupted. If your battery loses power
for any reason, you must unlock the radio with the secret
code before it will operate.
Activating the Theft
-Deterrent Feature
The instructions which follow explain how to enter your
secret code to activate the THEFTLOCK system. It is
recommended that you read through all nine steps
before starting the procedure.
If you allow more than 15 seconds to elapse between
any steps, the radio automatically reverts to time and
you must start the procedure over at Step 4.1. Write down any three or four
-digit number from
000 to 1999 and keep it in a safe place separate from
the vehicle.
2. Turn the ignition to ACCESSORY or RUN.
3. Turn the radio off.
4. Press the 1 and 4 pushbuttons at the same time. Hold
them down until
--- shows on the display. Next you
will use the secret code number which you have
written down.
5. Press MN and 000 will appear on the display.
6. Press MN again to make the last two digits agree
with your code.
7. Press HR to make the first one or two digits agree
with your code.
8. Press AM FM after you have confirmed that the
code matches the secret code you have written down.
The display will show REP to let you know that you
need to repeat Steps 5 through 7 to confirm your
secret code.
9. Press AM FM and this time the display will show
SEC to let you know that your radio is secure. The
LED indicator by the volume knob will begin
flashing when the ignition is turned off.

3-59
Unlocking the Theft-Deterrent Feature After a
Power Loss
Enter your secret code as follows; pause no more than
15 seconds between steps:
1. Turn the ignition on. LOC will appear on the display.
2. Press MN and 000 will appear on the display.
3. Press MN again to make the last two digits agree
with your code.
4. Press HR to make the first one or two digits agree
with your code.
5. Press AM FM after you have confirmed that the code
matches the secret code you have written down. The
display will show SEC, indicating the radio is now
operable and secure.
If you enter the wrong code eight times, INOP will
appear on the display. You will have to wait an hour
with the ignition on before you can try again. When you
try again, you will only have three chances to enter the
correct code before INOP appears.
If you lose or forget your code, contact your dealer.Disabling the Theft-Deterrent Feature
Enter your secret code as follows; pause no more than
15 seconds between steps:
1. Turn the ignition to ACCESSORY or RUN.
2. Turn the radio off.
3. Press the 1 and 4 pushbuttons at the same time.
Hold them down until SEC shows on the display.
4. Press MN and 000 will appear on the display.
5. Press MN again to make the last two digits agree
with your code.
6. Press HR to make the first one or two digits agree
with your code.
7. Press AM FM after you have confirmed that the code
matches the secret code you have written down. The
display will show
---, indicating that the radio is no
longer secured.
If the code entered is incorrect, SEC will appear on the
display. The radio will remain secured until the correct
code is entered.
When battery power is removed and later applied to a
secured radio, the radio won't turn on and LOC will
appear on the display.
To unlock a secured radio, see ªUnlocking the
Theft
-Deterrent Feature After a Power Lossº earlier in
this section.

3-62 Care of Your Cassette Tape Player
A tape player that is not cleaned regularly can cause
reduced sound quality, ruined cassettes or a damaged
mechanism. Cassette tapes should be stored in their
cases away from contaminants, direct sunlight and
extreme heat. If they aren't, they may not operate
properly or may cause failure of the tape player.
Your tape player should be cleaned regularly after every
50 hours of use. Your radio may display CLN to indicate
that you have used your tape player for 50 hours without
resetting the tape clean timer. If this message appears on
the display, your 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 your tapes and
player. If you notice a reduction in sound quality, try a
known good cassette to see if it is the tape or the tape
player at fault. If this other cassette has no improvement
in sound quality, clean the tape player.
The recommended cleaning method for your cassette
tape player is the use of a scrubbing action,
non
-abrasive cleaning cassette with pads which scrub
the tape head as the hubs of the cleaner cassette turn.
The recommended cleaning cassette is available through
your dealer (GM Part No. 12344789).When cleaning the cassette tape player with the
recommended non
-abrasive cleaning cassette, it is
possible that the cassette may eject, because the cut tape
detection feature on your radio may recognize it as a
broken tape. To prevent the cleaning cassette from being
ejected, use the following steps.
If your vehicle is equipped with the AM
-FM Stereo with
Cassette Tape Player do the following:
1. Turn the ignition to RUN or ACCESSORY.
2. Turn the radio on.
3. Insert the scrubbing action cleaning cassette.
4. Within five seconds, press and hold the REV and
FWD buttons at the same time for three seconds. The
tape symbol will flash on the display, showing that
the cut tape detection feature is no longer active.
5. Eject the cleaning cassette after the manufacturer's
recommended cleaning time.
If your vehicle is equipped with the AM
-FM Stereo with
Cassette Tape Player and Automatic Tone Control do the
following:
1. Turn the ignition to RUN or ACCESSORY.
2. Turn the radio off.