Those buttons run to a smart module that outputs commands over a data bus line. They don't actually have any real power as much as they are ground triggers! Just looked the diagram up and there is no wires you can use whatsoever! There are 2 wires to the shifter button 2 to the wheel Info buttons and the rest same deal. All the steering wheel/column controls run directly to modules using Lin bus/C bus lines. The max voltage on these is going to be 5v if any May only be grounds. I would not want to play with this as it won't take much to fry a module.
"CMR TUNER" [email protected] 1/4 with a 7.32 1/8 custom long/short bars by "Me" Turbocharged 392 on 9psi S475/96/1.32 . Running thru an A518! [email protected]