BMW 3 Owners & Service Manuals

BMW 3: Rear collision preparation

BMW 3 Series G20 (2018-2024) Owners Manual / Safety / Rear collision preparation

Concept

The system reacts to vehicles approaching from behind.

General information

Safety

Two radar sensors in the rear bumper monitor the area behind the vehicle.

When a vehicle approaches from the rear at a certain speed, the system responds as follows:

  • Active Protection: when a collision seems to be unavoidable, PreCrash functions are triggered.

Safety information

Warning The system cannot serve as a substitute for the driver's personal judgment in assessing visibility and traffic situation. There is a risk of accident.

Adjust driving style to traffic conditions. Watch traffic closely and actively intervene where appropriate.

Warning Indicators and warnings cannot serve as a substitute for the driver's personal judgment. Due to its limits, the system may not issue warnings or reactions, or these may be issued late or in a manner that is not consistent with their normal use. There is a risk of accident. Adjust driving style to traffic conditions. Watch traffic closely and actively intervene where appropriate.

Overview

Radar sensors

Safety

The radar sensors are located in the rear bumper.

Always keep the bumper in the area of the radar sensors clean and unobstructed.

Switching on/off

The system is automatically active after every driving off.

The system is deactivated in the following situations:

  • When driving in reverse.

System limits

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

  • When a vehicle is approaching at a speed much faster than your own.
  • When the approaching vehicle approaches slowly.
  • In heavy fog, wet conditions, or snowfall.
  • In tight curves or on narrow lanes.
  • If the bumper is dirty, iced up, or covered, for instance by stickers.
  • If the field of view of the sensors is covered, e.g., by garage walls, hedges or snow hills.
  • If cargo protrudes.

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