See also:

Deleting the button assignments
1. Press buttons 1 and 8 simultaneously for approx. five seconds. 2. "OK" ...

Tone
Only treble and bass can be set in the rear. The settings are made separately for the left and right headphones. Operation is the same as for the front tone. ...

Requirements
▷ Subscription to the optional Convenience Plan. ▷ The date setting on the Control Display is current. ▷ The vehicle is located within wireless network coverage. ...