Adaptive alarm headlights

[ticlide66]

Hi
On my 2011 30i I have this alarm which comes back every 200km approximately (adaptive alarm headlights) the dealer Bmw says that according to their reading of the error code the problem comes from a loss of signal between the computer and the module of the left headlight. The left and right headlight module has been changed and the same error code returns. The ground has been checked, a cable in the harness has been changed and the error remains. The BMW dealer here in Canada is in communication with BMW Germany to help them find the problem but they have not yet found it.
Has someone already had this problem ?

[RobbiZ4]