I have a 2005 Grand Voyager with a Becker BE 6802 fitted. The display screen has stopped working and it is also draining the life from the battery with a continuous red light flashing even with the ignition off. Does anyone know if this has to be replaced with the same unit, i'm not too bothered about using the Navigation facility but would like radio etc. There is also a DVD/6 Disc changer fitted below. Can I simply replace the Becker model with for example a Sony car Mini Disc player. Thanks for any help or advice you can offer.