2001 Intrepid SE auto door locks

I have a 2001 Dodge Intrepid SE and all the doors used to automatically lock when I reached 15 mph. I went out of town for a week and my mom drove my car and during that week her spare key got stuck in the ignition and she went through A LOT of jiggling and turning the car on and off to finally get the key out. After all that my car stopped automaically locking after going 15 mph. Does anynone know how I can make it start automaically locking again?? PLEASE HELP!!:1zhelp:

the owners manual suggests turning the key on/off 3xs ending in the "ON" position. Press the lock/unlock switch to lock (press down) and you should hear a chime indicating that the auto locks have been enabled.