BMW 5 Series Owners & Service Manuals

BMW 5 Series: Functional principle

Depending on the speed, the system is guided by the lane edges or vehicles driving ahead.

The position of the lane edges and the vehicle driving ahead is determined with the help of five radar sensors and the KAFAS stereo camera.

Functional principle
G30 Installation locations of radar sensors and KAFAS stereo camera

  1. Control unit for radar sensor, right (RSR)
  2. KAFAS stereo camera
  3. Blind Spot Detection (primary)
  4. Blind Spot Detection (secondary)
  5. Control unit for radar sensor, left (RSL)
  6. Active Cruise Control (ACC)

The system has two subfunctions: the Traffic Jam Assistant (second generation) and the Active Lane Keeping Assistant.

The Traffic Jam Assistant is available for speeds up to approximately 43 mph (70 km/h), the Active Lane Keeping Assistant from approximately 43 mph (70 km/h) to approximately 130 mph (210 km/h).

The table below shows an overview of the differences between the two subfunctions:

Functional principle

If the Traffic Jam and Active Lane Keeping Assistants are activated, the Side Collision Avoidance is also interlinked.


To ensure the driver is alert and able to react, he is urged to always have both hands on the steering wheel when the Active Lane Keeping Assistant and Traffic Jam Assistant are activated (established in the German road traffic regulations). If the driver takes both hands off the steering wheel rim, control is stopped after a few seconds during active control and the driver is requested to take over steering.

Additional information about Hands-off-Detection may be found in the "G12 Driver Assistance Systems" reference manual.


     Functional prerequisites

    The following prerequisites must be met in order for the Active Lane Keeping Assistant and Traffic Jam Assistant to be used: Speed must be below 130 mph (210 km/h). Above 43 mph (70 km/h

     Steering interventions

    If the current course of the vehicle deviates too much from the target trajectory (path curve), a steering correction is initiated. The steering intervention is a corrective measure. This means the


    The system is switched on via the Traffic Jam Assistant button on the multifunction steering wheel (MFL). G30 buttons for ACC Stop&Go with Active Driving Assistant Plus optional equipment


     Control units on the local CAN

    The control units on the local CAN are not displayed in the bus overview by the BMW diagnosis system ISTA. Diagnosis takes place via the corresponding primary control unit. Radar sensor (primary) Radar sensor, left (RSL) and radar sensor, right (RSR) The control units for the radar sensor, front r

     The right place for children

    Safety information Warning Unattended children or animals in the vehicle can cause the vehicle to move and endanger themselves and traffic, for instance due to the following actions: Pressing the Start/Stop button. Releasing the parking brake. Opening and closing the doors or windows. Engaging

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