92 100 stock Alarm
 

I have an issue w/ a battery drain when the car is off and I'm questioning the factory alarm setup as I have no clue how and what it operates. I seem to here some faint chirps, dings, gongs what ever you want to call the sound... How is the Alarm engaged?? (by door locks??)
Any help would be great as I have no oweners manual to clue me in