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This is a tough one, it sounds like the alarm is arming itself when you lock the door, the alarm system is arming , there is a way i think to cancel out the horn chrip, the only other thing is the door lock is bad or the alarm module is going bad. Did the horn always chrip or beep before and do you know if the alarm works?
holdboth the lock and unlosk buttons on your remote simultaneously for about five seconds until the lights flash and horn chirps.that should do it.if not i believe these models used a separate horn for security system.possibly fuse for this horn is bad or the horn itself is bad.to see if this horn works lower drivers window.stand outside vehicle and lock doors with remote.wait about a minute and reach in window and MANUALLY unlock and open door(do not use power door lock button)this should cause the system to activate...horn should beep and headlamps should flash.if horn beeps try my first suggestion.if it doesnt beep and just the head lamps flash check fuses and horn for security system.
Most likely your alarm system needs reset. When you use the button to turn the alarm on and off the horn beeps and lights flash. Horn beep when switch turned on, makes sense would be in the alarm system with all you've told.
Probably the door actuator - a part inside the door that activates the lock, particularly if neither the interior lock switch or the remote do not lock the door. Once the doors lock the horn will beep again - the lack of beep indicates the vehicle is not secure.