See also:

Notes
BMW CD/DVD players and changers are officially designated Class 1 laser products. Do not operate if the cover is damaged; otherwise, severe eye damage can result. Do not use self-recorded CDs/DV ...

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

Remove unnecessary cargo
Additional weight increases fuel consumption. ...