Steering Wheel Tiptronic Shifter Buttons

Trying to figure out which wires do what on the steering wheel shifter buttons. Experimenting is starting to get costly.There's a blue wire, a black wire, a brown-striped-brown wire (really?) and a brown-striped-red wire. I typically associate brown with ground on German cars, but since there's 2 brown wires, that's not the best indicator. Or maybe one of those is supposed to be some kind of German yellow...



Anyways, help would be appreciated. I already fried one of the switches by randomly jabbing 12v and ground wires around.