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There's a vac pump in the trunk. When the doors are lock/unlocked a signal goes to the vac pump which powers the pump and moves the door plunger. Look over these 2 articles for some basics on how it works:
http://myturbodiesel.com/1000q_how_to/a3b4/centrallocking.htm
http://myturbodiesel.com/1000q_how_to/a3b4/doorhandlefaq.htm
Look through this for a wiring diagram of the door system:
http://myturbodiesel.com/1000q_how_to/a3b4/keylessentry.htm
It's possible there could be a broken wire at the door hinge or broken vac line.
http://myturbodiesel.com/1000q_how_to/a3b4/centrallocking.htm
http://myturbodiesel.com/1000q_how_to/a3b4/doorhandlefaq.htm
Look through this for a wiring diagram of the door system:
http://myturbodiesel.com/1000q_how_to/a3b4/keylessentry.htm
It's possible there could be a broken wire at the door hinge or broken vac line.
