So, I did the install and everything works perfectly. When I was testing the unlock/lock feature, I opened the door, headlights came on like normal, closed the doors and I walked away form the truck about 10 to 15 feet. The headlights turned off after awhile, then, exactly 30 seconds later all doors locked themselves. I tried that 3 times in a row and every time the headlights go out and 30 seconds later the doors locked. I thought that is great. Went on to other things, like changed my DRL's to the turn signals and installed the sensors for the park assist and programmed the feature. Everything is working perfectly, even the self parking went fine. After that, I rechecked everything, but the self locking stopped working. I have no clue why. There has to be a function for the self locking feature when you walk away with FOB in your pocket. Could not duplicate it anymore.