Slippersi

Hello, I’m new to bmw , I got this 520d touring with a radio issue thinking I could fix that fairly easily , it all seemed to Piont to the mpm which I’d read so much about but when I got down in the the boot , the white box which looks like the mpm of forums comes up as air suspension module when checking the part number, can somebody please point me in the right direction as to what controls all of the i drive and radio and what to check , after fuses . it’s a 56 plate car . Thank you