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ROGERD, The motors as you found out should have a rubber boot over them to seal out water and dust.
If water gets into the center "twist screw" rod area, it goes to the bottom and can't evaporate out so will freeze in addition to corrode the operating shaft.
The lock/ unlock funtion just reverses the polarity to the motors. The control circuits are just seperate to meet the needs of the various options.
These are the same devices used in the Ford cars and trucks from the late 70s all the way up to the present day.
My 90 Lincoln LSC has them and have been changed already for the same reasons.
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