Go sit in your truck and close all the doors. Light stays on right? Put your key in the ignition. Does the chime start going off when you put the key in? If so, door switch or the GEM thinks a door is open.
To find out which door... Leave the key in the ingntion. Turn to the on position. Even with doors closed, chime sounds once after a few seconds and door ajar light comes on and stays on right? Open each door one by one. The chime should sound each time you open a door. When you find the door that doesn't make the chime sound when you open it, that is the problem. (Don't forget to try the rear hatch and the hatch glass also!) To determine if the switch is bad or if the GEM is having a problem thinking the door is open, just unplug the suspected switch, close all the doors, and see if the problem stops. (don't forget to wait a second to give the lights time to go off) If unplugging the switch solves it, the replace it. If it doesn't, Ford can check your GEM to see if it is the problem.
I hope this helps
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