E46 Touring rear screen demist radio interference

[Blackpuddin]

Just bought an '05 E46 Touring, switching on the rear screen heater generates instant (and complete) radio interference, is this a common problem and is there a straightforward fix? Probably not connected but will just mention that the wiper arm itself doesn't function (though the screen cleaner squirts out OK). Thanks for any advice.

[kev b]

Look for a break in the wires between the hatch and the body and check any earth connections as well.

[E30M3SE]

The above, check your lights on the rear tailgate also.

[NickXX]

Very common problem on e46s - my 330d had the issue. My M3 did too and had a replacement rear windscreen as a result.

[Blackpuddin]

NickXX said:

Very common problem on e46s - my 330d had the issue. My M3 did too and had a replacement rear windscreen as a result.

Because of radio interference by the rear window heater?

[sparks_E39]

My E39 does it, doesn't bother me though, I don't really use it (the heater, not the radio)

[Muska]

In an E46 touring the radio antennae is in the near side rear quarter window.

Mine does this same thing, I've no idea what it might be but would like to know so I can correct it.

[Jobbo]

Mine does this a bit - I think it's caused by the heated rear screen element wearing through where the rubber sits on it. When it's frosty or covered in condensation, turn on the heated rear screen and see how many of the wires actually heat up.

Replacement screens are pricey so if that is the problem, try some of that olde-worlde conductive paint first, to fill in the breaks in the element.