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Originally Posted by Whosdis  That is part of the safety system first released in the S-Class. It is called Pre-Safe. PRE-SAFE uses the ESP/BAS system to monitor the drive dynamics of the vehicle. If the conditions are right for the BAS to activate, then PRE-SAFE will snug-up the front seat belts, and adjust the front passenger seat to a more favorable position for impact. If you put the car in a severe skid and a roll-over is suspected, PRE-SAFE will also close the windows and sunroof. If nothing happens, the seatbelts return to their relaxed position, and you can reposition the front seats, windows and sunroof to your comfort. For a neat little video explaining PRE-SAFE's function, click on the link. Pre-Safe |
Not necessarily. The Pre-Safe isn't available on the E-Class the last time I checked. It's just the "basic" seatbelt tensioner working it's magic.