2011 Mercedes CL-Class Owner's Manual - Page 311

Driving systems Transmission position D R N Warning display Front area activated Rear and front areas activated 309 P No areas activated One or more segments light up as the vehicle approaches an obstacle, depending on the vehicle's distance from the obstacle. When the first red segment lights up, you hear an intermittent warning for about two seconds. From the second red segment, you hear a continuous warning. This indicates that you have now reached the minimum distance. Deactivating/activating PARKTRONIC : To deactivate/activate PARKTRONIC ; Indicator lamp If indicator lamp ; lights up, PARKTRONIC is deactivated. Z Driving and parking If the electric parking brake is engaged: no areas activated If the electric parking brake is released: rear and front areas are activated