Active Lane Keeping Assist monitors the area in front of your vehicle by means of multifunction camera 
. It serves to protect you against unintentionally leaving your lane. You will be warned by vibration pulses in the steering wheel and guided by a course-correcting brake application back into your lane.
Active Lane Keeping Assist detects a lane marking.
A front wheel drives over this lane marking.
Active Lane Keeping Assist detects lane markings on both edges of the lane.
A front wheel drives over a solid lane marking.
You can activate or deactivate the Active Lane Keeping Assist warning.
(green): Active Lane Keeping Assist is activated and operating. - (grey): Active Lane Keeping Assist is activated, but not operating.
: Active Lane Keeping Assist is deactivated or there is a malfunction.
Active Lane Keeping Assist can neither reduce the risk of an accident if you fail to adapt your driving style nor override the laws of physics. It cannot take into account road, weather or traffic conditions. Active Lane Keeping Assist is only an aid. You are responsible for maintaining a safe distance to the vehicle in front, for vehicle speed, for braking in good time and for staying in lane.
Active Lane Keeping Assist can bring the vehicle back into the lane with a lane-correcting brake application. In the case of a broken lane marking being detected, a brake application will only be made if a vehicle has been detected in the adjacent lane. Oncoming traffic can be detected.
Vehicles with Driving Assistance Package or Driving Assistance Plus Package: overtaking vehicles and vehicles in adjacent lanes can also be detected.
Vehicles without Driving Assistance Package or Driving Assistance Plus Package: a lane-correcting brake application also takes place when, in addition to a broken lane marking, the edge of a firm road surface is detected (e.g. central reservation).
Active Lane Keeping Assist is available in the speed range between 60 km/h and 200 km/h.
If a lane-correcting brake application occurs, display appears in the multifunction display.
The availability of the following function is country-dependent.
Active Lane Keeping Assist detects a solid lane marking.
A front wheel drives over this lane marking.
You clearly and actively steer, brake or accelerate.
You have switched on the turn signal indicator (situation-dependent).
A driving safety system intervenes, such as ESP®, Active Brake Assist or Active Blind Spot Assist.
You have adopted a sporty driving style with high cornering speeds or high rates of acceleration.
When ESP® is deactivated.
When driving with a trailer, the electrical connection to the trailer has been correctly established.
If a loss of tyre pressure or a defective tyre has been detected and displayed.
If there is poor visibility, e.g. due to insufficient illumination of the road, if there are highly variable shade conditions or in rain, snow, fog or heavy spray.
If there is glare, e.g. from oncoming traffic, the sun or reflections.
If the windscreen in the area of the multifunction camera is dirty, or if the camera is misted up, damaged or covered.
If there are no lane markings, or several unclear lane markings are present for one lane, e.g. around roadworks.
If the lane markings are worn, dark or covered.
If the distance to the vehicle in front is too short and thus the lane markings cannot be detected.
If the lane markings change quickly, e.g. lanes branch off, cross one another or merge.
If the carriageway is very narrow and winding.
Vehicles without Driving Assistance Package: Active Lane Keeping Assist uses radar sensors to monitor several areas around the vehicle. If the radar sensors in the rear bumper are dirty or covered with snow, the system may be impaired or may not function. If an obstacle in the lane in which you are driving has been detected, no lane-correcting brake application occurs.