2009 Mercedes R-Class Owner's Manual - Page 166

Controls in detail Driving systems brake pedal depresses automatically when the cruise control engages the brakes. Keep the driver's footwell clear at all times, including the area under the brake pedal. Objects stored in this area may impair pedal movement which could interfere with the braking ability of the cruise control system. Do not place your foot under the brake pedal - your foot could become caught. Activating cruise control You can activate the cruise control at a vehicle speed above 20 mph (30 km/h). You cannot activate the cruise control: Rwhen Rwhen you brake you have engaged the parking brake 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. Rwhen the automatic transmission is in park position P, reverse gear R, or neutral position N Rthe ESP® is switched off or has switched off Canceling cruise control X Depress the brake pedal. Briefly push the cruise control lever in direction of arrow 3. The last set speed is stored for later use. due to a malfunction The vehicle speed displayed in the speedometer can briefly vary from the speed setting for the cruise control system. or X Setting current speed X X Accelerate or decelerate to the desired speed. Briefly lift the cruise control lever in direction of arrow 1 or press in direction of arrow 2. Remove your foot from the accelerator pedal. 1 Setting current or higher speed 2 Setting current or lower speed 3 Canceling the cruise control 4 Activating the cruise control or resuming The last stored speed is deleted from memory when the engine is turned off. The cruise control switches off automatically when you depress the brake pedal or you engage the parking brake. The cruise control switches off automatically and an acoustic warning will sound when Rthe Rthe Rthe X vehicle speed falls below 20 mph (30 km/h) ESP® is in operation ESP® is switched off with the ESP® switch to last set speed i On uphill grades, the cruise control may not be able to maintain the set speed. Once 164