Buick 1993 Roadmaster Owner's Manual page 149

Anti-Theft Feature
Delco-Loc I1 is a security feature for the compact disc
player. It can be used or ignored. If ignored, the system
plays normally.
If
it is used, your player won't be usable
if it's ever stolen, because it won't turn on.
The instructions below tell you how
to
enter your
personal secret code into the system. If your vehicle
looses battery power for any reason, you must unlock
the system with the secret code before the system will
turn on.
Be sure to read through the entire procedure and become
familiar with the appropriate buttons and knobs before
starting.
Step 1. Write down any 6-digit number and keep it in a
safe place.
Step 2. Turn the ignitioin to the ACCESSORY or RUN
position.
Step 3. Press PWR to turn the radio off.
Step 4. Press presets 1 and 4 buttons together. Hold
them until
"-
-
-"
shows on. the display.
You are now ready to enter your secret code. If you
pause more than 15 seconds between steps you may
have to,start over.
1