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 > Safely transporting children in the vehicle: Securing Top Tether
WARNING Risk of injury or death if the rear seat backrests are not locked after installing Top Tether belts If the rear seat backrests are not locked, they could fold forwards in the event of an accident or during braking or sudden changes of direction. As a result, child restraint systems cannot p ...