Active Steering Assist is only available up to a speed of 210 km/h. The system helps you to stay in the centre of the lane by means of moderate steering interventions. Depending on the speed driven, Active Steering Assist uses the vehicles ahead and lane markings as a reference.
Depending on the country, in the lower speed range Active Steering Assist can use the surrounding traffic as a reference. If necessary, Active Steering Assist can then also provide assistance when driving outside the centre of the lane.
If the detection of lane markings and vehicles ahead is impaired, Active Steering Assist switches to passive mode. The system provides no support in this case.
Grey: activated and passive - Green: activated and active
- Red, flashing: prompt to the driver to actively confirm or transition from active to passive status, system limit detected
During the transition from active to passive status, the symbol is shown as enlarged and flashing. Once the system is passive, the symbol is shown as grey in the driver's display.
The driver is required to keep their hands on the steering wheel at all times and be able to intervene at any time to correct the course of the vehicle and keep it in lane. The driver must expect a change from active to passive mode or vice versa at any time.
If the system detects that the driver has not steered the vehicle for a considerable period of time or has removed their hands from the steering wheel, an optical warning is given first. Display 
appears in the driver's display. If the driver still does not steer the vehicle, or gives no confirmation to the system, a warning tone sounds in addition to the visual warning message.
If the driver does not react to this warning for a considerable period, an emergency stop is initiated More.
The warning is not issued or is stopped as soon as the system detects that the driver has touched the steering wheel.
The driver is wearing gloves.
There is a steering wheel cover on the steering wheel.
If Active Steering Assist detects that a system limit has been reached, a visual warning is issued and a warning tone sounds.
Observe the notes on driving systems and your responsibility; you may otherwise fail to recognise dangers More.
Active Steering Assist has a limited steering torque for lateral guidance. In some cases, the steering intervention is not sufficient to keep the vehicle in the lane.
There is poor visibility, e.g. due to snow, rain, fog, heavy spray, greatly varying light conditions or strong shadows on the carriageway.
There is glare, e.g. from oncoming traffic, direct sunlight or reflections.
Insufficient road illumination.
The windscreen is dirty, misted up, damaged or covered in the vicinity of the camera, e.g. by a sticker.
No, or several, unclear lane markings are present for one lane, or the markings change quickly, for example, in a construction area or junctions.
The lane markings are worn away, dark or covered up, e.g. by dirt or snow.
If the distance to the vehicle in front is too short and thus the lane markings cannot be detected.
The road is narrow and winding.
There are obstacles on the lane or projecting out into the lane, such as object markers.
If transport equipment, for example a trailer or bicycle rack, is attached to the trailer hitch and the electrical connection has been correctly established.
On very tight bends and when turning.
When crossing junctions.
At roundabouts or toll stations.
When actively changing lane without switching on the turn signal indicator.
When the tyre pressure is too low.
If the system limits of Active Steering Assist are reached there is no guarantee that the system will remain active or will keep the vehicle in lane.
The detection of lane markings and objects may malfunction and cause unexpected steering interventions.
You can watch an animation on this topic via the following link:
