hey guys i have a 02 325i. Its equip with a factory navi. recently i replace the final stage unit because my blower was staying on after the ignition was turn off witch was draining my battery. after replacing unit i encounter another problem, my radio/navi monitor is now dead. radio works fine but no image on the monitor. there is a dim blue screen with the ignition open but no image. read about a module for the Navi. any help on the location of this module would help. and can this be my problem.