Oldsmobile 2001 Silhouette Owner's Manual page 120

Once armed, the alarm will go off if someone tries to
enter the vehicle (without using the remote keyless
entry transmitter or a key), breaks a window, tries to
damage the vehicle or turns the ignition to ON. The
horn will sound and the parking lamps will flash for up
to two minutes.
When the alarm is armed, the liftgate may be opened
with the remote keyless entry transmitter or with a key.
Arming with the Power Lock Switch
Your alarm system will arm when you use either power
door lock switch to lock the doors while any door or the
liftgate is open and the key is removed from the ignition.
If you would like to turn on power door lock switch
arming, see "Multifunction Alarm Locks and Lighting
Choices" in the Index.
When the security light flashes quickly the system is
ready to arm with the power door lock switches. Then
the security light will stop flashing and stay on when
you press the rear of the power door lock switch, to let
you know the system is arming. After all doors and the
liftgate are closed and locked, the security light will
begin flashing at a very slow rate to let you know the
system is armed.
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Arming with the Remote Keyless
Entry Transmitter
Your alarm system will arm when you use your remote
keyless entry transmitter to lock the doors, if the key is
not in the ignition. The security light will turn on to let
you know the system is arming. After all doors and the
liftgate are closed and locked, the security light will
begin flashing at a very slow rate to let you know the
system is armed.
Arming with Your Key
Your alarm system will arm when you use your key to
lock the doors. The security light will turn on to let you
know the system is arming. After all doors and the
liftgate are closed and locked, the security light will
begin flashing at a very slow rate to let you know the
system is armed. If you would like your key not to arm
the system, see "Multifunction Alarm Locks and
Lighting Choices" in the Index.