Ford Repair Questions? Ask a Mechanic for Answers ASAP
Hello, is the vehicle equipped with an aftermarket alarm system? It only unlocks all the doors and not lock any doors?
Ok long as the alarm system isnt causing the issue, then it would a possible issue with water intrusion into the back of the fuse panel. The GEM Module(body control module) bolts to the back of the interior fuse panel. A leaking windshield seal is a common cause of water leaking into the back of the fuse panel and causing a short circuit and other electrical issues to occur. Remove the two large electrical connectors located on the back of the fuse panel, they are held in place by 10 mm bolts and inspect for blue/white corrosion. If this is the case the fuse panel and gem module need replaced and the windshield resealed. If not a diagnostic check for codes of the GEM module would need to be done with a dealer or high end scan tool to check for door codes/issues
I hear that, and sometimes you dont see it leak, it is a common issue on your model year f series. Seen a lot of them or issues with the gem module itself it will set a code for the door circuitry.
Then a diagnostic check of the gem module, see if codes are stored, check alarm system wiring connection,unplug alarm brain if not already to prevent issues with system