W220 AC Control Unit

The Automatic Climate Control Unit (Module N22) on the Mercedes-Benz S-Class (W220) is a dual-zone digital control interface that serves as a direct input hub for the vehicle's heating, ventilation, and air conditioning network.Because it communicates via the interior CAN B bus, a failure in this interface will not only leave you without temperature regulation but can also cause battery drain issues or disrupt communication with the engine cooling fan.