How It Works
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 has 2 functions that are activated by pressing the button for different lengths of time.
| Press button | Function |
|---|---|
| Short less than 10 seconds | Head-up display switched on or off |
| Long more than 10 seconds | Test functions are activated. This mode is intended for service staff (e.g. system test) |
As soon as the first test function is displayed, other test functions can be activated by briefly pressing the button.
NOTE:
Reactivating the head-up display
Press the button again and hold it for longer than 2 seconds to reactivate information relevant to the driver.