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I looked a little more into out of pure distraction. Looks like the when the truck is locked the BCM won’t send The open message if the key fob isn’t detected. There is no locking per se. The actuator just won’t open. Have you done any Forscan changes in the BCM perhaps? When you disconnect the antenna, your just removing the ability to open with the proximity. Since it doesn’t unlock when disconnected it sounds like the antenna is working properly but picking up a fob.  It electrical bugs can be weird. Hope you figure it out!