Just having a look at your protocols, the section that talks about steeringwheel buttons describes 'right arrow' and volume up/down. The steering wheel buttons on my 09 jeep liberty has up/down and another button in centre. So 3 buttons each side of the wheel. Is this the same as your car?
based on the info in your protocol, your car seems to have a dedicated volume switches. I think this is different to mine.
Here is what my steering wheel looks like....
Thanks for the pic. I still wouldn't mind playing with your board though, how much will 1 cost posted to 2153, Australia Ryan?
not bad, remember that my first case is repairing the ECU of left front light of a BENZ e300, i use a DAS to diagnostic it.