Buick 2005 Park Avenue Owner's Manual page 184

Theft-Deterrent Feature
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THEFTLOCK is designed to discourage theft of your
vehicle's radio. It works by using a secret code to
disable all radio functions whenever battery power
is interrupted.
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If THEFTLOCK is active, the THEFTLOCK
will flash when the ignition is off.
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The THEFTLOCK feature for the radio may be used or
ignored. If ignored, the radio plays normally and the
radio is not protected by the feature. If THEFTLOCK
activated, the radio will not operate if stolen.
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When THEFTLOCK is activated, LOC will appear on
the radio display to indicate a locked condition anytime
battery power has been interrupted. If the 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. Read through all nine steps before starting
the procedure.
3-70
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.
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indicator
2. Turn the ignition on.
3. Turn the radio off.
4. Press the 1 and 4 pushbuttons at the same time.
Hold them down until --- appears on the display.
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is
Next you will use the secret code number which you
have written down.
5. Press MIN and 000 will appear on the display.
6. Press MIN again to make the last two digits agree
with your code.
7. Press HRS 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
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down. REP will appear on the display to indicate
that Steps 5 through 7 need to be repeated to
confirm your secret code.
9. Press AM-FM again, SEC will appear on the display
to indicate that the radio is secure.