Mercedes-Benz C-Class Manuals

Mercedes-Benz C-Class Owners Manual: Active Distance Assist DISTRONIC

Function of Active Distance Assist DISTRONIC

Active Distance Assist DISTRONIC maintains the set speed on free-flowing roads. If vehicles in front are detected, the set distance is maintained, if necessary, until the vehicle comes to a halt. The vehicle accelerates or brakes depending on the distance to the vehicle in front and the set speed. The speed and distance to the vehicle in front are set and saved on the steering wheel on vehicles without the Driving Assistance Package, in the range between 15 mph (20 km/h) and 120 mph (200 km/h) and, on vehicles with the Driving Assistance Package, in the range between 15 mph (20 km/h) and 130 mph (210 km/h).

Other features of Active Distance Assist DISTRONIC:

  • Adjusts the driving style depending on the selected drive program (fuel-saving, comfortable or dynamic) .
  • Vehicles with Driving Assistance Package: reacts to stationary vehicles detected in urban speed ranges (except bicycles and motorcycles).
  • Initiates acceleration to the stored speed if the turn signal indicator is switched on to change to the overtaking lane.
  • Vehicles with Driving Assistance Package: takes one-sided overtaking restrictions into account on highways or on multi-lane roads with separate roadways (countrydependent).

Vehicles with Active Parking Assist and Driving Assistance Package: if the vehicle has been braked to a standstill on multi-lane, structurally separate roadways by Active Distance Assist DISTRONIC, it can automatically follow the vehicle in front driving off again within 30 seconds. If a critical situation is detected when driving off, a visual and acoustic warning is given indicating that the driver must now take control of the vehicle. The vehicle is not accelerated any further.

Active Distance Assist DISTRONIC is only an aid.

The driver is responsible for keeping a safe distance to the vehicle in front, for vehicle speed and for braking in good time.

System limitations

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

  • In snow, rain, fog, heavy spray, if there is glare, in direct sunlight or in greatly varying ambient light.
  • The windshield in the area of the camera is dirty, fogged up, damaged or covered.
  • If the radar sensors are dirty or covered.
  • In parking garages or on roads with steep uphill or downhill gradients.
  • If there are narrow vehicles in front, such as bicycles or motorcycles.

In addition, on slippery roads, braking or accelerating can cause one or several wheels to lose traction and the vehicle could then skid.

Do not use Active Distance Assist DISTRONIC in these situations.

WARNING Risk of accident from acceleration or braking by Active Distance Assist DISTRONIC
Active Distance Assist DISTRONIC may accelerate or brake in the following cases, for example:
  • If the vehicle pulls away using Active Distance Assist DISTRONIC.
  • If the stored speed is called up and is considerably faster or slower than the currently driven speed.
  • If Active Distance Assist DISTRONIC no longer detects a vehicle in front or does not react to relevant objects.
  • Always carefully observe the traffic conditions and be ready to brake at all times.
  • Take into account the traffic situation before calling up the stored speed.

 

WARNING Risk of accident due to insufficient deceleration by Active Distance Assist DISTRONIC
Active Distance Assist DISTRONIC brakes your vehicle with up to 50% of the maximum possible deceleration. If this deceleration is not sufficient, Active Distance Assist DISTRONIC alerts you with a visual and acoustic warning.
  • In these cases, adjust your speed and keep a sufficient distance.
  • Brake the vehicle yourself and/or take evasive action.

 

WARNING Risk of accident if detection function of Active Distance Assist DISTRONIC is impaired
Active Distance Assist DISTRONIC does not react or has a limited reaction:
  • when driving on a different lane or when changing lanes
  • to pedestrians, animals, bicycles or stationary vehicles, or unexpected obstacles
  • to complex traffic conditions
  • to oncoming vehicles and crossing traffic

As a result, Active Distance Assist DISTRONIC may neither give warnings nor intervene in such situations.

  • Always observe the traffic conditions carefully and react accordingly.

Operating Active Distance Assist DISTRONIC

Requirements:

  • The vehicle has been started.
  • The electric parking brake is released.
  • ESP is activated and is not intervening.
  • The transmission is in position D.
  • All the doors are closed.
  • Check of the radar sensor system has been successfully completed (vehicle traveling faster than 12 mph (20 km/h) ).
  • Parking Assist PARKTRONIC is not being used to park the vehicle or to exit from a parking space.
  • The vehicle does not skid.

Driving and driving safety systems

  • To activate/deactivate Active Distance Assist DISTRONIC: press button 1.
  • To activate Active Distance Assist DISTRONIC: press rocker switch 3 up (SET +) or down (SET-), or press rocker switch 4 up. Remove your foot from the accelerator pedal.

    The current speed is stored and maintained by the vehicle.

    or

  • To activate Active Distance Assist DISTRONIC with a stored speed: press rocker switch 4 up. Remove your foot from the accelerator pedal.

If rocker switch 4 is pressed up again after activation with a stored speed, Active Distance Assist DISTRONIC is activated with the speed restriction displayed in the instrument cluster.

  • To accept the displayed speed restriction when Active Distance Assist DISTRONIC is active: press rocker switch 4 up (RES).

    The speed limit displayed in the instrument cluster is adopted as the stored speed. The vehicle adapts its speed to that of the vehicle in front, but only up to the stored speed.

  • To pull away with Active Distance Assist DISTRONIC: remove your foot from the brake pedal and activate Active Distance Assist DISTRONIC.
  • Press rocker switch 4 up (RES).

    or

  • Depress the accelerator pedal briefly and firmly.

    The functions of Active Distance Assist DISTRONIC continue to be carried out.

WARNING Risk of accident due to Active Distance Assist DISTRONIC still being activated when you leave the driver's seat
If you leave the driver's seat while the vehicle is being braked by Active Distance Assist DISTRONIC only, the vehicle can roll away.
  • Always deactivate Active Distance Assist DISTRONIC and secure the vehicle to prevent it from rolling away before you leave the driver's seat.
  • To deactivate Active Distance Assist DISTRONIC: press rocker switch 4 down (CNCL).
  • To increase/reduce speed: press rocker switch 3 up/down to the pressure point.

    The stored speed is increased or reduced by 1 mph (1 km/h).

    or

  • Press and hold rocker switch 3 up/down to the pressure point.

    The stored speed is increased or reduced in increments of 1 mph (1 km/h).

    or

  • Press rocker switch 3 beyond the pressure point.

    The stored speed is increased or reduced by 5 mph (10 km/h).

    or

  • Press and hold rocker switch 3 beyond the pressure point.

    The stored speed is increased or reduced in increments of 5 mph (10 km/h).

  • To increase or reduce the specified distance from the vehicle in front: press rocker switch 2 up or down.
    Speed control cruise control

    Function of Active Speed Limit Assist

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