How do you operate the security system on a 1999 Chevy S10?

if you have a key fob hit the lock button and the doors should lock press it again, the horn should honk , alarm is on. to test it out roll your windows down first then go and lock the doors with the fob and hit lock to set the alarm on, (horn should honk) unlock the door by hand and open door, horn should honk quietly then go off full volume after 30 seconds