BMW Service Training New generation (NG) ... Radio Type X5 3.0i X5 3.0d X5 4.4i X5 3.0i X5 3.0d ... receive desired brightness information from the manual dimmer.
download:
http://share.qclt.com/bmw资料/ICT/English/Participant_manual/mfp-hgk-ng_radio-en.pdf
