2008 Mercedes SL-Class Owner's Manual - Page 235

Controls in detail Driving systems The Parktronic system deactivates at speeds exceeding approximately 11 mph (18 km/h). At lower vehicle speeds the Parktronic system turns on again. The Parktronic system also deactivates when you place the gear selector lever in position P or depress the parking brake pedal. The Parktronic system monitors the surroundings of your vehicle with six sensors in the front bumper and four sensors in the rear bumper. i To function properly, the sensors must be free of dirt, ice, snow and slush. Clean the sensors regularly, being careful not to scratch or damage the sensors, see "Cleaning the Parktronic system* sensors" ( page 337). Front sensors Center Corners Rear sensors Center Corners approx. 48 in (120 cm) approx. 32 in (80 cm) approx. 40 in (100 cm) approx. 24 in (60 cm) Range of the sensors ! During parking maneuvers, pay special attention to objects located above or below the height of the sensors (e.g. planters or trailer hitches). The Parktronic system will not detect such objects at close range and damage to your vehicle or the object may result. Ultrasonic signals from outside sources (e.g. truck air brakes, car wash, or jackhammers) may impair the operation of the Parktronic system. 1 Sensors in the front bumper 234