See also:

Activating HDC
Press the button; the LED above the button lights up. ...

Following part replacement
The same breaking in procedures should be observed if any of the components mentioned above have to be renewed in the course of the vehicle's operating life. ...

Swapping the telephone and additional telephone
The function of the telephone and additional telephone can be swapped automatically. 1. "Telephone" 2. "Bluetooth® (phone)" 3. "Swap phone/addit. phone" ...