2009 Mercedes SLR McLaren Owner's Manual - Page 67

Safety and Security Occupant safety Head-thorax air bags Occupant Classification System The Occupant Classification System (OCS) automatically turns the passenger front air bag and passenger-side knee air bag on or off based on the classified occupant weight category determined by weight sensor readings from the passenger seat. i If the seat needs to be serviced in any way, take the vehicle to an authorized Mercedes-Benz Center. Only seat accessories approved by Mercedes-Benz may be used. i The system does not deactivate the head-thorax air bag and the emergency tensioning device. Both driver and the passenger should always use the PASSENGER AIR BAG OFF indicator lamp ( page 70) as an indication of whether or not the passenger is properly positioned. 1 Head-thorax air bag The head-thorax air bags are deployed: in side impacts exceeding a preset deployment threshold on the impacted side of the vehicle independently of the front air bags The head-thorax air bags are not deployed in side impacts which do not exceed the system's deployment threshold. Occupants must sit properly belted in a position that is as upright as possible with their back against the seat backrest and feet on the floor to be correctly classified. If the occupant's weight is transferred to another object in the vehicle (e.g. by leaning on armrests), the OCS may not be able to properly approximate the occupant's weight category. 67