See also:

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

Increasing the volume
In some cases, the volume of the AUX device may be quieter or louder, or the usual maximum possible volume cannot be reached. On some devices, it is possible to adjust the volume separately. I ...

AMG displays
Press or on the steering wheel to select the AMG menu. 1 Gear indicator 2 Upshift indicator 3 Engine oil temperature 4 Coolant temperature Upshift indicator UP 2 indicates that the ...