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Old 01-12-2013, 10:11 PM   #2
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The diagram shows it has three wires at the switch itself, a ground and two return wires back to the GEM. So I would guess that's a 3-wire switched ground (at the switch).
(I have no idea what the 2-step possibility is ???)

The output to the locks:
The polarity switches depending on if locking or unlocking (the motor goes forward or reverse) I don't know how it determines how long to run the lock/unlock motor

(the above post is based ONLY on looking at the wiring diagram, I have not ever laid my hands on these wires or done an aftermarket deal like you are)
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