BMW 3 Owners & Service Manuals

BMW 3: Warning function

If you leave the lane

If you leave the lane and if a lane marking has been detected, the steering wheel vibrates in accordance with the steering wheel vibration setting.

If the turn signal is switched on before a lane change, a warning is not issued.

Steering intervention

Depending on the equipment version: if, in the speed range up to 130 mph/210 km/h a lane marking is crossed, the system may intervene with a brief active steering intervention in addition to vibrating. The steering intervention helps keep the vehicle in the lane. The steering intervention can be noticed on the steering wheel and can be manually overridden at any time. During an active steering intervention, the display in the instrument cluster will blink.

Warning signal

Depending on the equipment version: In the event of multiple active steering interventions by the system within 3 minutes without the driver's intervention at the steering wheel, an acoustic warning will sound. A short warning signal will sound at the second steering intervention. Beginning with the third steering intervention, an continuous warning will sound.

In addition, a Check Control message is displayed.

The warning signal and Check-Control message are an encouragement to pay closer attention to the lane.

End of warning

The warning is canceled in the following situations:

  • Automatically after approx. 3 seconds.
  • When returning to your own lane.
  • When braking hard.
  • When using the turn signal.
  • If DSC Dynamic Stability Control intervenes.

System limits

Safety information

Warning The system is designed to operate in certain conditions and circumstances. Due to conditions or other factors, the system may not respond.

There may be a risk of accident or risk of damage to property. Actively intervene as warranted. Refer to the information in this Owner's Manual regarding the scope of the system's operation and limitations.

Functional limitations

The system may not be fully functional in the following situations:

  • In heavy fog, wet conditions, or snowfall.
  • In the event of missing, worn, poorly visible, merging, diverging, or multiple lane markings such as in construction areas.
  • When lane markings are covered in snow, ice, dirt or water.
  • In tight curves or on narrow lanes.
  • When lane markings are covered by objects.
  • When driving very close to the vehicle in front of you.
  • If there are constant blinding effects because of oncoming light, for instance from the sun low in the sky.
  • If the field of view of the camera or the windshield is dirty or covered in the area of the interior mirror.
  • If the camera has overheated and been temporarily switched off due to excessively high temperatures.
  • Up to 10 seconds after the start of the engine via the Start/Stop button.
  • During calibration of the camera immediately after vehicle delivery.

A Check Control message may be displayed when the system is not fully functional.


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