BMW M3 Sedan 2011 - Manual (Page 158)

On/off and tone
156
4. Select the desired volume setting.
5. To adjust: turn the controller.
6. To store: press the controller.
Resetting tone settings
You can reset all tone settings to the default
setting.
1. "CD/Multimedia", "Radio" or "Settings".
2. "Tone"
3. "Reset"
Online Edition for Part no. 01 41 2 604 638 - © 02/10 BMW AG