I came across this actuator re-build tutorial while searching for a door lock actuator wiring diagram and thought I'd share w/ the group. I know it describes the procedure for a Mini, but the Mini's actuator looks eerily similar to our DII's.

Repair Mini Cooper Electric Door Lock Actuator / Locking Mechanism

 

I don't believe that one motor is for locking and the other is for unlocking at least on our trucks.
I think the second motor is for "superlock"?

Along time ago I took mine apart and put the "superlock" motor in place of the bad motor. I think I had to swap the plastic ends and the good brushes from the "superlock" motor into the back plastic section of the lock/unlock motor plastic.
The plastic ends can only plug into one place in the housing.
I don't remember now if I even put the now dead "superlock" motor back in the housing.
It's been working fine for years.
I do remember there being a center pin that had a push clip, the clip broke when I removed it and I think I replaced it with a flathead screw and a nut.
And I didn't care about the clips on the white cover as they will break, I just broke them all off, the center bolt/pin I mentioned above I believe held it on anyway.