Mercedes-Benz C-Class Manuals

Mercedes-Benz C-Class Owners Manual: Active Lane Keeping Assist

Function of Active Lane Keeping Assist

Driving and driving safety systems

Active Lane Keeping Assist monitors the area in front of your vehicle by means of multifunction camera 1. 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.

You are warned by vibration pulses in the steering wheel in the following circumstances:

  • Active Lane Keeping Assist detects a lane marking.
  • A front wheel drives over this lane marking.

You will also be guided back into your lane by means of a course-correcting brake application if the following conditions are met:

  • 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.

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 the distance to the vehicle in front, for vehicle speed, for braking in good time and for staying in your 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.

Active Lane Keeping Assist is available in the speed range between 37 mph (60 km/h) and 124 mph (200 km/h).

Driving and driving safety systems

If a lane-correcting brake application occurs, display 1 appears in the multifunction display.

System limitations

No lane-correcting brake application occurs in the following situations:

  • 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.
  • If a loss of tire pressure or a faulty tire has been detected and displayed.

The system may be impaired or may not function in the following situations:

  • 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 windshield in the area of the multifunction camera is dirty, or if the camera is fogged 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 roadway is very narrow and winding.

Vehicles with Driving Assistance package or Driving Assistance Plus 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.

Activating/deactivating Active Lane Keeping Assist (vehicles with Parking Assist PARKTRONIC)

WARNING Risk of accident despite Active Lane Keeping Assist warning
A lane-correcting brake application cannot always bring the vehicle back into the original lane.
  • Always steer, brake or accelerate yourself, especially if Active Lane Keeping Assist warns you or makes a lane-correcting brake application.

 

WARNING Risk of accident despite intervention of Active Lane Keeping Assist
Active Lane Keeping Assist does not detect traffic conditions or road users. In very rare cases, the system may make an inappropriate brake application, e.g. after intentionally driving over a solid lane marking.

The brake application can be interrupted at any time if you steer slightly in the opposite direction.

  • Always make sure that there is sufficient distance to the side for other traffic or obstacles.

 

WARNING Risk of accident despite Lane Keeping Assist
Lane Keeping Assist cannot always clearly detect lane markings.

In such cases, Lane Keeping Assist can:

  • give an unnecessary warning
  • not give a warning
  • Always pay particular attention to the traffic situation and keep within the lane, especially if Active Lane Keeping Assist alerts you.

Be sure to observe the system limitations of Active Lane Keeping Assist.

Driving and driving safety systems

  • Press button 2.

    If indicator lamp 1 lights up, Active Lane Keeping Assist is activated, the lane markings are shown as light in the assistance graphic. When Active Lane Keeping Assist is active, the lane markings are shown in green in the assistance graphic.

Setting the sensitivity of Active Lane Keeping Assist

Multimedia system:

  • Vehicle →Assistance → Act. Lane Keep. Assist
  • Select a setting.

Activating/deactivating the warning

  • Switch Lane Depart. Warning on or off .

    You do not receive any warning when leaving a lane if the lane keeping warning system is deactivated.

Vehicle towing instructions

The vehicle is not suitable for the use of tow bar systems that are used for flat towing or dinghy towing, for example. Attaching and using tow bar systems can lead to damage on the vehicle.

When you are towing a vehicle with tow bar systems, safe driving characteristics cannot be guaranteed for the towing vehicle or the towed vehicle. The vehicle-trailer combination may swerve from side to side. Comply with the permitted towing methods and the instructions for towing with both axles on the ground.

    Blind Spot Assist and Active Blind Spot Assist with exit warning

    Instrument Display and on-board computer

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