Chevrolet 2002 Venture Owner's Manual page 146

Content Theft Deterrent (Option)
-
If your vehicle has this option, it has a theft
alarm system.
A light located on top of your instrument panel (near the
center of the vehicle, next to the windshield) will flash
slowly to let you know that the system has been armed.
While armed, the doors will not unlock with the power
door lock switch.
2-38
Once armed, the alarm will go off if someone tries to
enter the vehicle (without using the remote keyless entry
-
deterrent
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.
The security light flashes quickly to let you know when
the system is ready to arm with the power door lock
switches. 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.