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 > System settings : Activating/deactivating PIN protection
Multimedia system: System → PIN Protection Setting the PIN Select Set PIN. Enter a four-digit PIN. Enter the four-digit PIN again. If both PINs match, PIN protection is active. Changing the PIN Requirements A current PIN must be set. Select Change Settings. Enter the current PIN. Select Change PIN ...