See also:

Interior motion sensor
The windows and glass sunroof must be closed for the system to function properly ...

Safety notes
Do not remove the cover The BMW CD/DVD player is a Class 1 laser product. Do not operate if the cover is damaged; otherwise, severe eye damage can result.◀ ...

Maintenance
The battery is maintenance-free, i.e., the electrolyte will last for the life of the battery. Your service center will be glad to advise you on questions regarding the battery. ...