BMW 3 Owners & Service Manuals

BMW 3: Warning with braking function


A warning symbol appears in the instrument cluster and in the Head-up Display, where available, if a collision with a detected vehicle is imminent.

Danger of collision with vehicle crossing from the right.

Danger of collision with vehicle crossing from the left.

Danger of collision with vehicle for which the direction of travel cannot be determined.

Prewarning: Symbol lights up red: prewarning for vehicles that cross your direction of travel.

Intervene yourself, for instance by braking.

Acute warning: Symbol flashes red and an acoustic signal sounds: acute warning when vehicles cross your direction of travel.

Brake and make an evasive maneuver, if necessary.


For example, a prewarning is displayed when a danger of collision with a crossing vehicle is detected.

If a prewarning is provided, respond by braking as warranted.

Acute warning with braking function

An acute warning is displayed in the event of an immediate danger of collision with a crossing vehicle.

Intervene in the case of an acute warning. If an acute warning is provided, the system may provide assistance, such as through braking, when there is risk of collision.

Acute warnings may be provided even when there has been no prior warning.

Braking intervention

The warning prompts the driver to intervene.

The system may also assist in braking if there is a risk of collision.

The vehicle can be decelerated to a standstill.

The braking intervention occurs only if vehicle stability has not been restricted, for instance by deactivating the DSC Dynamic Stability Control.

The driver may interrupt the braking intervention function by stepping on the accelerator pedal or by actively moving the steering wheel.

The system's ability to detect objects may be limited in some circumstances. Refer to the information in this Owner's Manual regarding the limitations of the system and actively intervene as warranted.

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.

Upper speed limit

The system responds to crossing vehicles when your own speed is below approx.

50 mph/80 km/h.

Detection range


The system's detection potential is limited.

Thus, a system reaction might not come or might come late.

The following situations may not be detected, for instance:

  • Crossing vehicles when they are hidden by buildings, for instance.
  • Vehicles that suddenly swerve in front of you, or sharply decelerating vehicles.
  • Crossing bicycles.
  • Vehicles with an unusual side appearance.

Functional limitations

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

  • In heavy fog, wet conditions, or snowfall.
  • In tight curves.
  • If the driving stability control systems are limited or deactivated, for instance DSC OFF.
  • 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.
  • If the radar sensors are dirty or covered.
  • After improperly performed work on the vehicle paint.
  • Up to 10 seconds after the start of the engine via the Start/Stop button.
  • During calibration of the camera immediately after vehicle delivery.
  • If there are constant blinding effects because of oncoming light, for instance from the sun low in the sky.

Attaching any objects such as stickers or film in the beam area of the radar sensors will also impact the function of the radar sensors and may even cause them to fail.

Warning sensitivity

The more sensitive the warning settings are, for example the warning time, the more warnings are displayed. Therefore, there may also be an excess of premature or unjustified warnings and reactions.


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