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while although I'm not familiar with this locking system, thinking about some basics, it sounds like a loose wire/ground, or a short. The reason I say this is that I'm sure there is a relay somewhere in the locking harness or module, and it keeps getting hit with an on/off voltage. One on/off voltage cycle--the relay goes to the "open door" circuit. Another on/off voltage cycle--the relay goes to the "close door" circuit. Etc.
Maybe you can find out if there is an accessible/replacable relay in this system and this try replacing this. But it could be a non-serviceable part and part of a locking "module" that needs replacement. But first check for loose wiring/grounds.
I suppose you could get ahold of a wiring schematic circuit for this system, search for a relay, take a look at that component, and then follow wires from that point.
good luck
Jay
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