additionally ...

I don't mean to suggest that passing ALL of the signals of the various switches (including paddles) of most current Mercedes wheels (through the clockspring) is not possible. It is just not practical. I could create a module that would voltage code all of the switches and then another to decode them (after the signals have passed through the clockspring) .... the problem is how do you use these control signals now.

The Crossfire is not set up to accept these control signals.

Interfacing with existing external and semi-external momentary-on switches (autostick up/down for example) is possible .....perhaps even cruise control functions and other mom-on switch controlled functions...
However, the task of converting them into CAN commands and or having them control your radio etc becomes an expensive (impractical) proposition.

Chris

P.s. please excuse my simplified overview of Mercedes steering switch implementation in the previous post. There are actually more than a few subtle variations of the control matrix (so to speak). The post was running long and I thought that I was giving was more than enough info. In truth, Mercedes, over time, has made subtle changes to the implementation which it normally incorporates as they revamp a given model (or family of models in the case of closely tied model lines). If more specific info is wanted... feel free to send me a PM