2010 Mercedes GL-Class Owner's Manual - Page 55

Occupant safety The PRE-SAFE® system takes preventive measures to better protect the occupants from the possibility of personal injuries in the following hazardous situations: Remergency 53 Rcritical dynamic driving situations, e.g. when the vehicle has been caused to understeer or oversteer because it has exceeded its physical limitations or in case of evasive steering maneuvers at speeds above approximately 85 mph (140 km/h) NECK-PRO active front head restraints The NECK-PRO active front head restraints are intended to offer the driver and front passenger increased protection from whiplash-type injuries. In the event of a rearend collision, the NECK-PRO active front head restraints on the front seats are designed to move forward in the direction of travel. They thus provide the head with increased support earlier on in the collision sequence. The NECK-PRO active front head restraints will move forward whether the seats are occupied or not. PRE-SAFE® takes the following measures when it is activated: RThe front seat belts are pre-tensioned automatically. RVehicles with front passenger seat memory function: If the passenger seat is in an unfavorable position, the seat will be adjusted to a position that seeks to better protect the occupant. RIf the vehicle is in a critical dynamic driving situation, the door windows close, except for a minimal gap that remains open. RVehicles G Warning! with power tilt/sliding sunroof: If the vehicle is in a critical dynamic driving situation, the tilt/sliding sunroof also closes, except for a minimal gap that remains open. Do not attach any objects (e.g. hangers) to the head restraint posts. Otherwise, the NECKPRO active front head restraints may not be able to function properly or offer the intended degree of protection they were designed for in the event of a rear-end collision. If the closing procedure of any of these elements is blocked, it will stop and open slightly. Once the hazardous situation no longer exists and an accident has been avoided, the seat belt pre-tensioning is deactivated. All of the PRE-SAFE® settings can be re-adjusted following the critical driving event. If the seat belts do not release: X G Warning! Adjust the seat backrest or seat slightly to the rear until the seat belt tension is reduced. The locking mechanism releases. Only use seat or head restraint covers which have been tested and approved by MercedesBenz for your vehicle model. Using other seat or head restraint covers may interfere with or prevent the activation of the NECK-PRO active front head restraints and/ or the deployment of the front side impact air bags. Contact an authorized Mercedes-Benz Center for availability. When the NECK-PRO active front head restraints have been triggered in an accident, the NECK-PRO active front head restraints Z Safety and security braking maneuvers with the Brake Assist System (BAS) (Y page 63) activated ! When moving the seats, make sure there are no items in the footwell or behind the seats. Otherwise, you could damage the seats and/or the items. For information on the seat belt adjustment function as an integrated comfort feature of PRE-SAFE®, see (Y page 51).