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 (W204) 2007 - 2014 Training Manual > Body and Safety: Front Emergency Tensioning Retractors
Restraint/emergency tensioning retractor system The emergency tensioning retractor in the W204 is a new design of toothed rack retractor tensioner. The functioning principle is based on the fact that an integrated toothed rack, which is fired pyrotechnically, unwinds via a cogwheel connected to the ...