A few minutes after the heating of the rear glazing in the BMW 3 E46, it should be cleared of precipitation and snow with the formation of visible lines on the surface. If this is not the case, there is a heating problem. In order to detect it it is necessary to check the safety of the safety in the fuse box. If it is, check the cable connection to the right and left of the rear window. It is sometimes sufficient to clear the corrosion connection and the heating starts working correctly. If it does not help, check the electrical wires, the relays and the switch, or contact the BMW technical center.
