Cadillac 1999 DeVille Owner's Manual page 75

Theft Deterrent System (If Equipped)
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The light will also flash if the battery has been
disconnected and reconnected. To arm the system, do
the following:
1. Open the door.
2. Lock the door using the power door lock or the
remote keyless entry transmitter. The SECURITY
light should come on and stay on.
3. Close all the doors. The SECURITY light should go
off within about 30 seconds.
The horn will sound and the lamps will flash for about
30 seconds when the door or trunk is opened without the
key or the remote keyless entry transmitter. The horn
also sounds if the locks are damaged.
If the ignition is off and
any door is open, the
SECURITY light will flash,
reminding you to activate
the system.
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Remember, the theft deterrent system won't activate if
you lock the doors with a key or use the manual door
lock. It activates only if you use a power door lock
button or the remote keyless entry transmitter.
To avoid activating the alarm by accident:
D
Always unlock a door with a key or use the remote
keyless entry transmitter. (Pressing the unlock button
on the remote keyless entry transmitter disables the
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theft deterrent system.) Unlocking a door any other
way will activate the alarm. Cycling the ignition
without disarming the theft
also activate the alarm.
D
The vehicle should be locked with the door key after
the doors are closed if you don't want to activate the
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theft deterrent system.
If you activate the alarm by accident, unlock any door
with your key. You can also turn off the alarm by using
the unlock button of the remote keyless entry
transmitter. The alarm won't stop if you try to unlock a
door any other way.
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deterrent system will
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