GMC 1998 Safari Owner's Manual page 178

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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. Your
audio system is equipped with THEFTLOCK
if
THEFTLOCK is displayed on the front of the radio.
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.
NOTE: 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
7. Press HR to make the first one or two digits agree
with your code.
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
indicator by the volume control will begin flashing
when the ignition is turned off.
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