Brightness Adjustment
WARNING: This page is about a different car, the 2005 BMW 645Ci and 2004 BMW 645Ci. However, it is still accessible from the selected car via links, so may be relevant.
The brightness adjustment takes into account the individual brightness setting for the head-up display, deviating from the basic setting. The individual brightness setting is made in the CID (Central Information Display) using the controller. The set value is stored in the head-up display as part of the Car and Key Memory.