2007 Mercedes SL-Class Owner's Manual - Page 211

Controls in detail Driving systems Activating cruise control You can activate the cruise control when the vehicle speed is above 20 mph (30 km/h). In the following cases you cannot activate the cruise control: when you brake when you have set the parking brake when the gear selector lever is set to position P, R, or N when the ESP® is switched off Setting current speed Accelerate or decelerate to the desired speed. Briefly lift the cruise control lever in direction of arrow 1 or depress in direction of arrow 2. The current speed is set. Remove your foot from the accelerator pedal. The cruise control is activated. The currently set speed appears in the multifunction display. Warning! G The cruise control brakes automatically so that the set speed is not exceeded. Keep in mind that the cruise control is a convenience system designed to assist the driver during vehicle operation. The driver is and must always remain responsible for the vehicle's speed and for safe brake operation. i The vehicle speed displayed in the speedometer can briefly vary from the speed setting for the cruise control system. i On uphill grades, the cruise control may not be able to maintain the set speed. Once the grade eases, the set speed will be resumed. On downhill grades, the cruise control maintains the set speed by braking with the vehicle's brake system. In addition, on longer downhill grades the automatic transmission will downshift automatically. 1 Setting current or higher speed 2 Setting current or lower speed 3 Canceling the cruise control 4 Activating the cruise control or resuming to last set speed 210