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Since it is the job of the Body Control Module (BCM) to operate your door locks, as well as monitor your door lock circuits, the best place to BEGIN diagnosis of this problem is by scanning your BCM to see what it has to say about this.
BCM's are pretty loose-lipped....If they know anything about the malfunction, or who the culprit is that caused it, you only have to put a small amount of heat on. With the correct interrogation techniques and equipment, they will squeal like a pig!
That sound is going to be your door lock motors wearing out. I would suggest getting them replaced pretty quickly as they will soon stop locking altogether. It's not cheap, but it isn't horribly expensive either.
I called dodge local service dealer and ask the chief mech. He said the lock unlock switch had two resistors, Lock was 7200 ohms and the unlock had a 620 ohm both going to the PCU (computer) with an reduced 12 voltage supply to the CPU the CPU looks at the amount of reduced and will energize the lock or unlock Solenoid. added the resisters to each solenoid lock 7200 ohm and unlock 620 ohm on the ASTRA 600 alarm output to the CPU. works OK. Thanks for your Interest in my problem.