4x4 wiring question

[trucktech]

I have a 2010 5.3 with 6l80 and transfer case. The question is how do I setup the wiring for the transfer case since it is push button? I've asked venders that make harnesses for this type of engine/trans setup if they support the transfer case wiring and they don't. So it looks like I'm going to have to do it myself but don't have the foggiest as to how to wire it up. Does anyone know if there is some kind of computer involved or can I just wire it strait to a switch? any and all insight is welcomed. Thanks