Not sure why my '10 OB does this...manual doesn't say. When locking the doors I have a bad habit of hitting the lock button on the fob twice. Each time I get a regular beep. If you hit it a third time though it changes from the normal high pitched beep to a single horn honk. Does this mean some other type of security measure has been engaged or is it the OB just saying quit pushing the button so many dang times. Not sure what possesed me to hit it 3 times to begin with.