Hi all just after some help, my girlfriends dad has a 530i, in the last few months the sat nav has stopped working and now so has the tv, the sat nav constantly says insert disc and the tv is fuzzy like the aerials disconnected

Also the reversing sensors don't work, I was just wondering if anyone else has experienced this and if there are any cures

I was thinking to maybe disconnect the battery for a while and see if it changes

Help is much appreciated thanks