Notes on display messages Display messages appear on the multifunction display. Display messages with graphic symbols are simplified in the Operator's Manual and may differ from the symbols on the multifunction display. The multifunction display shows high-priority display messages in red. Certain display messages are accompanied by a warning tone. Please respond in accordance with the display messages and follow the additional notes in this Operator's Manual. For some display messages, a symbol is also shown: 
 You can select the desired symbol by swiping left or right on the left-hand Touch Control. 
Press the  
You can hide low-priority display messages by
pressing the  Rectify the cause of a display message as quickly as possible. High-priority display messages cannot be hidden. The multifunction display shows these display messages continuously until the cause of the message has been rectified. Calling up stored display messages On-board computer: Service → Message If there are no display messages, No Messages appears on the multifunction display. 
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Mercedes-Benz C-Class (W205) 2015 - 2021 Owners Manual > Seats: Head restraints
   Adjusting the front seat head restraints mechanically WARNING Risk of injury from adjusting the vehicle settings while the vehicle is in motion You could lose control of the vehicle in the following situations: if you adjust the driver's seat, the head restraint, the steering wheel or the mirror whi ...