Button For Switching Head-Up Display On And Off: Notes
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 button is located to the right of the rotary switch for the parking lights and dipped-beam headlights, and below the button for the rear fog lights.