How do you disconnect the theft alarm on a 2002 Pontiac Montana?

To disconnect the theft alarm on a 2002 Pontiac Montana, first, ensure that the vehicle is unlocked. Insert the key into the ignition and turn it to the "On" position without starting the engine. Press the "Unlock" button on the key fob, or manually unlock the driver's door using the key. If the alarm continues to sound, disconnect the battery for a few minutes to reset the system.