If you are seeing any malfunction related to above functions or getting vertical aim headlight failure message or malfunction, it means that module needs to be replaced. Xenons4u proudly offer high quality BMW 7316217 7329157 7305235 7304905 7267044 TMS Headlight Driver Module to replace an old faulty ballast. 7304593 BMW Headlight Driver Module is responsible for controlling light leveling up and down, Angel Eyes (Halo Rings) and front turn signal (indicator). If you are unsure about fitment, please contact our customer support for help. Or visit our website for complete information.