Turn the ignition off. When you restart the engine, the service light should be gone. Method 2: Using Steering Wheel Buttons (If Equipped) Some 2012 Vitos have a multifunction steering wheel with left/right arrow buttons and an “OK” button.
Once in the Service menu, use the up/down arrows to find “ASSYST PLUS” or “FULL SERVICE” . mercedes vito 2012 service reset
Close all doors. Turn the ignition to position 1 (engine off). Turn the ignition off