Mercedes-Benz C-Class (W205) 2015 - 2021 Owners Manual: System settings 

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Mercedes Benz C-Class (W204) 2007 - 2014 Training Manual > Emergency Operations: Resetting triggered NECK-PRO head restraints
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 th ...