2011 Mercedes GL-Class Owner's Manual - Page 199

Driving systems Transmission position D R or N P Warning display Front area activated 197 No areas activated One or more segments light up as the vehicle approaches an obstacle, depending on the vehicle's distance from the obstacle. From the: Rsixth Vehicles with Advanced Off-Road-Package : To deactivate/activate PARKTRONIC ; Indicator lamp segment onwards, you will hear an intermittent warning tone for approximately two seconds. Rseventh segment onwards, you will hear a warning tone for approximately two seconds. This indicates that you have now reached the minimum distance. If indicator lamp ; lights up, PARKTRONIC is deactivated. Towing a trailer PARKTRONIC is deactivated for the rear area when you establish an electrical connection between your vehicle and a trailer. Deactivating/activating PARKTRONIC ! Fold in the ball coupling if the trailer tow hitch is not required. PARKTRONIC measures the minimum detection range to an obstacle from the bumper, not the ball coupling. ! Vehicles with an exterior spare wheel: Remove the detachable ball coupling if the trailer tow hitch is not required. PARKTRONIC measures the minimum detection range to an obstacle from the bumper, not the ball coupling. Vehicles without Advanced Off-Road-Package : To deactivate/activate PARKTRONIC ; Indicator lamp Z Driving and parking Rear and front areas activated