i remember reading recently that apparently the sensor telling the car that the front seat was occupied (for the use of the seat belt warning and airbag in case of an accident) was being affected by high temperatures and it was postulated that the facelift cars had seat heating that was less... intense... as a result.
what did you end up doing about this? did the old unit go back in?
surprisingly i've still had no problems with my facelift climate unit. all still works as intended, 3 months after installation.