2006 Mercedes R-Class Owner's Manual - Page 272

Controls in detail Driving systems ! Keep in mind that in rough or uneven roads, adjusting the vehicle to a lower level may cause the vehicle underbody to come in contact with the road and result in damage to the vehicle underbody. Always make sure the vehicle has sufficient ground clearance before adjusting it to a lower level. i The activation threshold is defined by the set suspension tuning ( page 269). Compared to the highway level, the vehicle level changes by + 1.97 in (+ 50 mm) in raised level +/- 0 in (+ 0 mm) in highway level - 0.78 in (- 20 mm) in highspeed level The vehicle lowers to highspeed level automatically when the vehicles speed exceeds 70 mph (112 km/h) the vehicles speed is between 60 mph (96 km/h) and 70 mph (112 km/h) for longer than 20 seconds i The high-speed level is not available when towing a trailer. Basic settings There are two setting from which to choose: Raised level, for driving on rough roads Highway level, for driving on paved roads in fair or better condition ! Before jacking up the vehicle with equipment that lifts one or more of the wheels completely off the ground, remove the SmartKey from the starter switch. i Obey local speed limits. Use prudent driving speeds appropriate to prevailing conditions. ! Please also note the information in the section on towing ( page 499). i The third available level is the highspeed level that is set automatically. 271