See also:

Belt-force limiter
The effect of the belt-force limiter on the driver's seat is dependent on the position of the driver's seat. To maintain the long-term accuracy of this function, the driver's seat must be calib ...

Tire inflation pressures X5 xDrive50i with three rows of seats
  ...

Buckling the belt
Make sure you hear the latch plate engage in the belt buckle. ...