2002 F-250 SD 7.3L KEY FOB problem
 

The door lock buttons on all four doors work fine. If the truck is unlocked, the key FOB unlock button works fine, when pressed, you can hear the actuators working. When I press the key FOB Lock button, it locks the doors and the key FOB no longer works. In order to make it work again, a door must be manually unlocked with the key, opened and closed for the key FOB to work again (but it only works as previously described). Can anyone please help me figure out what is going on here?