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w212 pre face lift. "C" next the command knob is for?

rester · 2020-11-14T08:29:40+0000

There is a this button next to the command knob that states "C" Abit unsure on what it is and cannot find it in my instruction manual. Googled around and only found C/S but i am guessing it is not that as i have another button for E/S (economy/sport) already. can any sifus here guide me on what the heck it is for?