2003 Mercedes C-Class Owner's Manual - Page 201

Controls in detail Loading Warning! G i To prevent unauthorized persons from access to the trunk, always lock backrest in its upright position. If a red indicator is visible with the backrest up, then the backrest is not properly locked into position. Always lock backrest in its upright position when rear seat bench is occupied, cargo is being carried in the trunk, or the extended cargo compartment is not in use. Check for secure locking by pushing and pulling on the backrest. In an accident, during hard braking or sudden maneuvers, loose items will be thrown around inside the vehicle, and cause injury to vehicle occupants unless the items are securely fastened in the vehicle. To help avoid personal injury during a collision or sudden maneuver, exercise care when transporting cargo. If the backrest is not locked into position, a red indicator 5 will be visible. Check for secure locking by pushing and pulling on the backrest. 201