If the NECK-PRO head restraints were triggered during an accident, you have to reset the head restraints for the driver and front passenger seats. Otherwise, this additional protection will not be available during a later rear end collision. Triggered head restraints can be recognized by the fact that they are moved forward and can no longer be adjusted.
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Mercedes-Benz C-Class (W205) 2015 - 2021 Owners Manual > Seat belts: Protection provided by the seat belt
Always fasten your seat belt correctly before starting a journey. A seat belt can only provide the best level of protection if it is worn correctly. WARNING Risk of injury or death due to incorrectly fastened seat belt If the seat belt is not worn correctly, it cannot perform its intended protective ...