Chevrolet 1998 Express Van Owner's Manual page 157

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.
2.
3.
4.
5.
6 .
7.
Write down any three or four-digit number from
000
to 1999 and keep it in a safe place separate from
the vehicle.
Turn the ignition to ACCESSORY or RUN.
Turn
the
radio off.
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.
Press MN and 000 will appear on the display.
Press MN again to make the last two digits agree
with your code.
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
indicator by the volume control will begin flashing
when the ignition is turned off.
Unlocki
~
the Theft-Deterrent Feature After a
Power Loss
Enter your secret code as follows; pause no more than
15 seconds between steps:
1. LOC appears when the ignition is on.
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.
code matches the secret code you have written down.
The display will show SEC, indicating the radio is
now operable and secure.
5. Press AM-FM after you have confirmed that the
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