Anyone knows what is the round switch that is near the ECU, behind the battery for? It is labelled with numbers from 1 to 7 (or 8, I don't remember). Is it R16?
My car has another similar switch marked "S" and "N", near the ignition unit, at the other side of the hood.

It is a 190E 2.3 8valve, 1992.

Thanks!