See also:

Restoring the factory settings
Press the and buttons simultaneously for approximately six seconds until the battery check lamp flashes twice. ...

SPLITVIEW
SPLITVIEW allows you to simultaneously use different COMAND functions on the frontpassenger side and on the driver's side. Depending on the viewing angle of the display (from the driver's seat ...

Adjusting the brightness, contrast or color
Select Source in the rear-compartment screen and press the button on the remote control to confirm. Select Display Aux or Disk Drive Aux and press the button to confirm. Select Brightness ...