2010 Mercedes GL-Class Owner's Manual - Page 158

156 Driving systems The DSR is an aid for driving downhill. The DSR regulates your vehicle's speed when driving downhill to the value set in the control system (Y page 141). The steeper the downhill gradient is, the greater the brake application. On flat road surfaces, the DSR brakes only slightly or not at all. system (Y page 141). The next time the DSR is switched on, the DSR will use the newly programmed default speed to regulate the vehicle's speed. Once the DSR is switched on, you can adjust the set speed using the cruise control lever (Y page 145). Keep in mind that adjusting the set speed using the cruise control lever with the DSR switched on will not change the programmed default speed. If the DSR is switched off and then switched on again, the DSR will use the programmed default speed. Depending on the road surface and level of downhill grade, the DSR may not be able to maintain the set speed. To maintain the set speed, apply the brakes if necessary. Controls in detail G Warning! The Downhill Speed Regulation (DSR) is a convenience system designed to assist the driver during vehicle operation. The system must be set to be appropriate for the topographical and weather conditions encountered which can change quickly. The driver is and must remain at all times responsible for the vehicle speed and for safe brake operation. Depending on the programmed speed, actual vehicle speed and gradient, switching on the DSR while driving can cause the vehicle to slow down rapidly and you may hear a sound which is caused by the activation of the vehicle's brake system through the DSR. Sudden and unexpected deceleration can result in loss of vehicle control, causing an accident and/or serious personal injury to you and others. Do not switch on the DSR in a circumstance where rapid deceleration could result in a loss of vehicle control. Switching the DSR on/off The DSR regulates the vehicle's speed in automatic transmission positions D, or R. Vehicles without enhanced off-road package i In addition, make use of the engine's braking effect by shifting the automatic transmission into a lower gear. You can drive slower or faster than the set speed at any time by braking the vehicle or depressing the accelerator pedal. i Whenever the DSR is switched on, the DSR will use the programmed default speed to regulate the vehicle's speed. The default speed programmed at the factory is 4 mph (Canada: 6 km/h). The default speed can be reprogrammed using the control Vehicles with enhanced off-road package