I've got a 2002 3.0 diesel X5, the rear window wiper is permanently operating on intermittent mode while driving, if i select reverse it goes into fast wipe mode, also if i have the radio on and select the rear window demist the radio signal is destroyed, im presuming somewhere on the wiring loom there's a break with wires touching. Is this a known fault on X5's or does anyone know where the breaks likely to be, i've checked inside the body to tailgate rubber flexible tube and the wires are fine there which is were you would imagine the break would be, any ideas/help please