Press the volume knob to turn on the CD.

The specific steps to close are as follows:

1. Press the brake pedal of the BMW 520.

2. Press the one-button start button of BMW 520.

3. The BMW 520’s instrument lights up and the entire vehicle is powered on.

4. Press the multimedia switch button located on the BMW 520.

5. At this time, the car audio of the BMW 520 will no longer play music.