If you need to get at the bolts at a boneyard, a 12 volt battery from a Makita screw gun works great. You just have to figure out which wires you need.
That's not exactly manually but not sure there's any other way. A big downside of these new fangled contraptions.
I made a seat switch out of 4 BMW window switches. Took some doing with a continuity tester to dissect the working of the switches but it works great. Thread about it
here.