Repaired Sticking Door Lock Switch

Just as an FYI. The door lock switch on the driver side door of my 2001 Malibu started sticking both in the up and down position. I removed the screw behind the door handle and removed the small panel with the door lock switch. I had some lithium grease so I sprayed it into the switch and rocked the switch back and forth. It works great now. Only curious thing is that before I did this when the chime would sound and doors locked just the lights would flash when it locked. Now the lights flash and the horn toots. I actually like it better now, but don't know what I did to cause the horn to toot when the doors lock.