2000 GMC SONOMA ignition

3-14
AUTO TONE: Press this button to select among the
six preset equalization settings and tailor the sound to the
music or voice being heard. Each time you press the
button, the selection will switch to one of the preset
settings of CLASSIC, NEWS, ROCK, POP, C/W
(Country/Western) or JAZZ. To return to the manual
mode, press and release this button until the AUTO TONE
display goes blank. This will return the tone adjustment to
the BASS and TREB controls. If a BASS or TREB
control is rotated, the AUTO TONE display will go blank.
Use PUSHBUTTONS to program AUTO TONE.
Adjusting the Speakers
BAL: Press lightly on this knob to release it from its
stored position. Turn the control clockwise to adjust
sound to the right speakers and counterclockwise to
adjust sound to the left speakers. The middle position
balances the sound between the speakers.
FADE: Press lightly on this knob to release it from its
stored position. Turn the control clockwise to adjust the
sound to the front speakers and counterclockwise for the
rear speakers. The middle position balances the sound
between the speakers.
Push these knobs back into their stored positions when
you're not using them.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.
To load a cassette tape with the ignition off, press EJECT
or RECALL. Then, insert the cassette tape. If the ignition
is on but the radio is off, the tape will begin playing.
Once the tape is playing, use the VOL, AUTO TONE,
BAL, FADE, BASS and TREB controls just as you do
for the radio. The tape symbol and a direction arrow will
be on the display whenever a tape is being played.
Anytime a tape is inserted, the top side is selected for
play first.
The player automatically senses if the cassette tape is
metal or CrO
2 and adjusts for best playback sound.
PREV (1): Press the PREV button or the SEEK left
arrow to search for the previous selection. A minimum
three
-second blank gap is required for the player to stop
at the beginning of the selection. The tape direction
arrow will blink during the SEEK operation.
PROG (2): Press this button to switch from one side of
the tape to the other.

3-15
NEXT (3): Press the NEXT button or the SEEK right
arrow to search for the next selection. A minimum
three
-second blank gap is required for the player to stop
at the beginning of the selection. The tape direction
arrow will blink during the SEEK operation. The sound
will mute while searching for the next selection.
REV (4): Press this button to rapidly reverse the tape to
the beginning of the cassette or until you press REV
again. The radio will play the last selected station while
reversing the tape. The tape direction arrow will blink
during the reverse operation.

(5): Press this button to reduce cassette tape noise.
The double
-D symbol will appear on the display while
the player is in this mode.
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.
FWD (6): Press this button to rapidly forward the tape
to the end of the cassette or until you press FWD again.
The radio will play the last selected station while
forwarding the tape. The tape direction arrow will blink
during the forward operation.AM
-FM: Press this button to switch from a tape
to the radio.
TAPE AUX: Press this button to return to the tape
player when playing the radio. The lighted arrow will
appear and show the direction of play when a tape is in
the active mode.
EJECT: Press this button to remove the tape. The radio
will now play. EJECT can be used with either the ignition
or radio off. To load a cassette tape with the ignition or
radio off, press EJECT before loading the cassette.
CLN: 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. After you clean
the player, press and hold EJECT for five seconds to
reset the CLN indicator. The radio will display
--- to
show the indicator was reset.

3-16
CD Adapter Kits
It is possible to use a portable CD player adapter kit
with your cassette tape player after activating the bypass
feature on your tape player.
To activate the bypass feature, use the following steps:
1. Turn the ignition to RUN or ACCESSORY.
2. Turn the radio off.
3. Press and hold the TAPE AUX button for five
seconds. The tape symbol on the display will flash
for two seconds, indicating the feature is active.
4. Insert the adapter into the cassette slot. It will power
up the radio and begin playing.
This override routine will remain active until EJECT
is pressed.AM-FM Stereo with Compact Disc Player
and Automatic Tone Control (If Equipped)
Playing the Radio
PWR
-VOL: Press this knob to turn the system on and
off. To increase volume, turn this knob clockwise. Turn
it counterclockwise to decrease volume. The knob is
capable of rotating continuously.
RECALL: Display the time with the ignition off by
pressing this button. When the radio is playing, press
this button to recall the station frequency.

3-19
Playing a Compact Disc
PWR: Press this knob to turn the system on.
(You can also turn the system on when you insert a
compact disc into the player with the ignition on.)
Insert a disc partway into the slot, label side up. The
player will pull it in. Wait a few seconds and the disc
should play. CD and a CD symbol will also appear on
the display. Anytime you are playing a CD, the letters
CD will be next to the CD symbol.
If the disc comes back out and ERR appears on the
display, it could be that:

You are driving on a very rough road.
(The disc should play when the road gets smoother.)

The disc is upside down.

It is dirty, scratched or wet.

It is very humid.
(If so, wait about an hour and try again.)

The disc player is very hot.
Press RECALL to make ERR go off the display.
PREV (1): Press PREV or the SEEK left arrow to
search for the previous selection. If you hold this button
or press it more than once, the disc will advance further.
Sound is muted in this mode.RDM (2): Press this button to play the tracks on the disc
in random order. While in the RDM mode, RANDOM
appears on the display. Press RDM again to return to
normal play.
NEXT (3): Press NEXT or the SEEK right arrow to
search for the next selection. If you hold this button or
press it more than once, the disc will advance further.
The next track number will appear on the display. Sound
is muted in this mode.
REV (4): Press and hold REV to return rapidly to a
favorite passage. You will hear the disc selection play at
high speed while you press the REV button. This allows
you to listen and find out when the disc is at the desired
selection. Release REV to resume playing.
FWD (6): Press and hold this button to advance rapidly
within a track. You will hear the disc selection play at
high speed while you press the FWD button. This allows
you to listen and find out when the disc is at the desired
selection. Release FWD to resume playing.
RECALL: Press this button to see what track is playing.
Press it again within five seconds to see how long the
CD has been playing that track. Elapsed time is
displayed in minutes and seconds. The track number
will also appear when a new track begins to play. Press
RECALL again to return to the time display.

3-20
AM-FM: While in the CD mode, press this button to
stop playing the CD and play the radio. The CD symbol
will still display but the word CD will be replaced with
either AM, FM1 or FM2. (If the radio is turned off, the
disc stays in the player and will resume playing at the
point where it stopped.)
CD AUX: To switch between the player and the radio
when a disc is playing, press the AM
-FM button. To
return to the player, press CD AUX. When a disc is
playing, the letters CD and the CD symbol will appear
on the display. (If the radio is turned off, the disc stays
in the player and will resume playing at the point where
it stopped.)
EJECT: Press this button to eject the disc from the
player and play the radio. When the same or a new disc
is inserted, the disc will start playing on track one. If a
compact disc is left sitting in the opening for more than
a few seconds, the player will pull the CD back in. The
radio will continue playing. When the ignition is off,
press this button to load a CD.
Remote Cassette Tape Player (If Equipped)
If you have an AM-FM Stereo Audio Compact Disc
Automatic Tone Control System that includes a remote
cassette player, the cassette player is located in the
center of the instrument panel.
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.
To load a cassette tape with the ignition off, first press
EJECT on the remote player. Then, insert the cassette tape.
The tape will play if the ignition is on but the radio is off.
Once the tape is playing, use the control knobs for VOL,
AUTO TONE, BAL, FADE, BASS and TREB just as
you do for the radio. A lighted tape symbol shows when
a cassette tape is in the player. A lighted arrow will
also appear and show the direction of play when a
tape is active.

3-21
The player automatically senses if the cassette tape is
metal or CrO
2 and adjusts for best playback sound.
Anytime a cassette tape is inserted, the top side is
selected for play first.
PREV (1): Press PREV or the SEEK left arrow (in the
opposite direction that the lighted tape direction arrow
points) to search for the previous selection. A minimum
three
-second blank gap is needed for the player to stop
at the beginning of the selection. The tape direction
arrow will blink during the SEEK operation and the
sound is muted in this mode.
NEXT (3): Press NEXT or the SEEK right arrow (in the
direction that the lighted tape direction arrow points) to
search for the next selection. The tape direction arrow
will blink during SEEK operation and the sound is
muted in this mode.
REV (4): Press this button to rapidly reverse the tape.
The tape will rapidly reverse to the beginning of the
cassette reel or until you press REV again. The radio
plays the last selected station during REV.(5): Press this pushbutton to turn Dolby on and off. Dolby
is active when a tape is inserted in the remote cassette. The
double
-D symbol 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.
FWD (6): Press this button to rapidly advance the tape.
The tape will rapidly advance to the end of the cassette
reel or until you press FWD again. The radio plays the
last selected station during FWD.
PROG: Press this button on the remote player to go
from one side of the tape to the other.
TAPE: Press the AM
-FM button to switch from the
player and the radio when a tape is playing. To return to
the tape player, press CD AUX. The lighted arrow will
appear next to the symbol and show the direction of play
when a tape is active.
EJECT: Press this button on the remote player to
remove the tape. EJECT can be used with either the
ignition or radio off. Also, you must press EJECT before
loading a cassette with the radio off to allow loading.

3-22 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 buttons together. 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 control will begin
flashing when the ignition is turned off.

3-23
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 buttons together. 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.