Door ajar and courtesy light

[Mariopio]

I have just bought a 2003 Expedition, and noticed that when i open any door the courtesy lights doesn’t turn on as well as the door ajar message doesn’t show. I think is difficult that every door sensor is broken and I suppose that the former owner did some bypassing/disconnecting to save money instead of buying a new sensor. Could you help me solving it?
Thanks in advance.

The manual switch works and when I close the doors the lights work as well.

 

[Mariopio]

I reply to myself and to everyone that have similar problems:
This is the solution!
It fixes not only those two problems but even fob not programming, driver seat not move on key turn, and others.

 

[01exp4x4]

nice video