SWW: Master control unit for lane change warning

NOTE: As of F15, the master control unit of the lane change warning is located in the rear left. For the other vehicles, rear right.

The SWW control unit of the lane change warning (SWW) is simultaneously a radar sensor (24 GHz) and a control unit. The control unit is installed in the rear right above the bumper bracket. From the outside, the radar sensor is not visible, rather it is covered by the bumper.

The radar sensors mostly work regardless of weather. The distance for a sure detection is approx. 60 meters.

Fig 1: Identifying SWW Control Unit Related Components

Courtesy of BMW OF NORTH AMERICA, INC.

Example F01

Item	Explanation
1	SWW control unit for lane change warning (master controller)
2	Mounting bolts
3	12-pin plug connection

Only the master control unit has a control unit address as well as a diagnosis address, thus making it a control unit. The purpose of the radar sensor is to generate and send the radar waves. There is an integrated receive circuit. Signals are sent and received across a flat aerial.

The mounts of the radar sensors cannot be adjusted mechanically. Instead of adjusting the radar sensors mechanically (in the same way as e.g. the long-range sensor of the active cruise control), a correction angle must be stored via diagnosis.