Here's a new one. I bought a 2002 F350 Dually Diesel 7.3L Lariat Crew Cab. I had the famous faulty VSM issue that plagued many a 2002 model. Got a new security module and everything worked just fine... Except for the doors. The door ajar light constantly stayed on. I do NOT want to pay my local stealership $140 to dig for my VSM and reprogram it since pretty much everything else worked plug and play.

Hoping it was the other infamous stuck door ajar sensor issue, I've been making my door lock hinges drunk on WD40 with no positive results. This saddened me. Today, though, I made a interesting observation.

TL;DR:
The door ajar light goes OFF when both front doors are OPEN. Back doors have no effect one way or the other. I was thinking if I switch the polarity of the door ajar buttons by just crossing the wires associated, that should fix my problem. Has anyone done this?

 

So my truck has the same issue

Sadly
You have to pay the stealership to program it, when you put the new CSM/VSM in it reverted to a non programmed state of factory default
And the only way it tells you is the door ajar sensors

I still haven't fixed mine.

In theory you could take the wires that go to the latch out and cut them and then switch them out with each other and that should work since the whole thing is a light switch basically.

But it is a very tight space
I'm paying my stealership
I'm lazy when it comes to electronics

 

Switching the wires will not fix the problem. The switch either makes contact or it doesn't. You would have to either complete the circuit or leave it open to resolve the situation. You'll have figure out if the switch is normally open or normally closed to know which one to do.