See also:

Adjusting the volume
Turn the knob until the desired volume is selected. The setting is stored for the remote control currently in use. The vehicle automatically adjusts the volume of the microphone on the telepho ...

Screw thread
Push out the cover by pressing on the top edge. ...

Adjusting
The parking lamps or low beams must be switched on to adjust the brightness. Adjust the brightness using the thumbwheel. ...