DSR is an aid to assist you when driving downhill. It keeps the speed of travel at the selected target speed. The steeper the downhill gradient, the greater the DSR braking effect on the vehicle. On flat stretches of road and uphill gradients, the DSR brakes the vehicle minimally or not at all.

When DSR is activated and the transmission is in position , or , DSR controls the driving speed. The target speed can be set to a value between 2 km/h and 18 km/h. By braking or accelerating, you can drive at a higher or lower speed than the target speed at any time.

DSR is deactivated automatically if you drive at speeds greater than 45 km/h or select drive program or . The off message then appears in the multifunction display. The status indicator in the multifunction display disappears. You also hear a warning tone.