Hi I am new to this so here goes. I have 330ci with tv/cd/dvd/ipod and sat nav. The sat nav picture works but no sound. Also radio/cd/dvd.ipod all dont work (no sound.) Was all working just stopped. Checked all fuses,all ok. disconected units and plugged back in. Tried another bm54 radio module, Still not working,CAN ANYONE HELP.