FORD FOCUS 2002 ZETEC Problems- key fob not working, no rear de-mister, no central locking, no chime noises, no indicators, no hazard lights inside or on dash, no interior light, no dash light for sidelights or headlights, and finally no boot catch operating. All the fuses have been checked, bulbs and earth checked. The battery keeps going flat overnight. Replaced key fob battery but no change. Disconnected GEM and left but no change. I no noises at all. So have ordered another GEM but I would like to know if I change it does it need reprogramming by ford and do they have to fit it? Thanks