Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
,Since all of these bottons are part of the upper control panel- the whole panel is faulty and must be replaced. This control panel is basically a separate control unit, which sends the comands to other units.
It is a switch group which includes hazard warning, central locking, seat heating/ventilation and other switches. All of them are one assmebly, called upper control panel.