Buick REGAL 1997 Manual page 187

AM-FM: Press this button to play the radio when a disc
is in the player.
SOURCE: Press this button to change to the disc
function when the radio is on. When a disc is inserted,
the disc will play until you press AM-FM. Then the
disc will stop playing and the radio will play. Press
SOURCE again to play a disc again. CD PLAY will
show on the display.
EJECT Press this button to remove the disc. The radio
will play.
If you turn off the ignition or radio
with a disc in the
player,
it
will stay in the player. When you turn on the
ignition or system, the disc will start playing where it
stopped, if it was the last-selected audio source.
Also, as a protection feature, if a CD is ejected and left
in the player, it will be pulled back in the player with the
ignition on or off. If you leave a compact disc in the
player while listening to the radio, it may become warm.
Theft-Deterrent Feature
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.
If THEFTLOCK is active, the THEFTLOCK indicator
will flash when the ignition is off.
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 is removed. 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.