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I recently acquired an 07 explorer for my youngest daughters high school career. Despite the 179,000 miles it's in excellent condition.
Concerning the door locks. In my experience Ford key fobs are click once to unlock the drivers door and twice for the rest. This vehicle unlocks all doors with a single button push. Sometimes pushing the lock button activates the unlock side of the system. Replaced the fob batteries and eventually the fobs, but that isn't the problem.
If that was the only issue I could live with it, but in addition, the locks also unlock themselves randomly. The dome lights and park lights come on like the fob was used, but it happens even if I lock it with the interior button and leave the fob at home. Sometimes its two seconds after the doors are locked, sometimes it's two hours, but they always unlock.
I've deactivated both the auto lock and auto unlock features. I can find no issues with fuses or wiring, so I can only conclude that whatever module that controls the door locks is malfunctioning. I need to know what module I need to acquire. I've read a hundred threads about GEMS, and VSM's, and PATS, etc etc. But nobody seems to be having quite the same issues.
I had some really weird behavior with locks and interior lights on my '99 Mountaineer. Like you, I was thinking GEM or some other module. It turns out that the problem was due to some broken wires between the door and the body on the driver's side. If I remember correctly, one of the wires was a ground. The issue wasn't obvious until I took the rubber boot off and examined the wires. While I was in there, I also investigated why the power mirrors weren't working. They weren't doing anything weird but just didn't work. I found that a wire had been swapped on one of the connectors. I suspect the previous owner saw an unpopulated socket on the connector and decided to move a wire into that position while trying to fix the other issues. Anyway, I guess I would stick with the wiring. Do a physical inspection of the wires between the door and the body. A swapped wire is unlikely, but you never know what people will do. Get yourself a wiring diagram.