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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > UK Technical Forum > radio interference



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      12-09-2010, 12:09 PM   #1
Mark Leeds
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radio interference

Anyone had a problem with the rear heated window causing interference with the radio?

just started to happen on my e90 318 58 plate its already been in forthe coils replacing twice quality appears to be not what it was this is my 5th BMW in a row.
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      12-09-2010, 01:42 PM   #2
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How do you know its the demister causing it?
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      12-09-2010, 01:56 PM   #3
no_ball
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pull the fuse for the rear heater and see if problem goes away
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      12-12-2010, 08:31 AM   #4
bpc101
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I get that too... Thought it was just a design fault as had it on a E39 before.
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      12-12-2010, 09:26 AM   #5
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Hi Mark,

Sounds like an earthing issue, was common on the pre 2005 cars (E46 etc). The aerial wiring and demister wiring share the same location. As your car's a 58 plate it'd get it looked at under warranty.

the 20i petrol is an engine to avoid due to reliability issues. Don't know if your 18i is the same engine but detuned. This is the case for 20d and 18d respectively
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      12-12-2010, 12:00 PM   #6
JonnySi
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Its the heated rear window elements which share the same earth as the aerial diversity in the high level brake light.
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      12-12-2010, 05:30 PM   #7
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My M3 has had this fault a couple of times in the past week or so.

Only first thing in the morning tho' when really cold. All the radio stations on the idrive disappear leaving maybe just radio 1 and a local station. Trying to listen to either of them however is useless as they sound like the aerial has been unplugged.

Get in the car later on in the day and all is back to normal radio station list has repopulated with 20-30 stations and radio becomes crystal clear again?

Has happened 2 or 3 times now but always rectifies itself. I used to run LED DRL's and these caused interference but have since removed them and popped the OEM bulbs back in so know it isn't those causing the problem.
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      05-08-2012, 03:26 PM   #8
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Looks like my car is suffering this - rear demister on, radio reception is mostly hiss. Turn it off and radio back to normal.

Pretty sure this is covered under extended warranty - so will get it booked in.

Also, a couple of peeps have said i sound very echo-ey and faint on the phone. Maybe releated as well
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      04-09-2014, 02:49 PM   #9
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stuck on the same problem, -> rsmallwo, maybe u know where is aerial wiring and demister wiring earth location? Please.
If its common fault on bmw (e46, e90..) anybody fixed it?
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      10-25-2014, 03:59 PM   #10
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My 2006 started doing this 2 days ago also my heated mirrors are not working now.
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      10-27-2014, 06:05 AM   #11
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Quote:
Originally Posted by Mark Leeds View Post
Anyone had a problem with the rear heated window causing interference with the radio?

just started to happen on my e90 318 58 plate its already been in forthe coils replacing twice quality appears to be not what it was this is my 5th BMW in a row.
I get this. Here's a really funny work around that works for me (08 E91), but YMMV:

If you tuned in the FM station on preset 1 from your last journey, but when you get in this time the reception is bad, press the 1 button to re-tune it to the currently tuned station. Make no logical sense but works for me when ever the reception get's a bit bad.

hth.

sp
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      11-10-2018, 05:12 AM   #12
bee-ma
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Is there a DIY way to fix this problem, instead of replacing the rear windscreen?

I have the radio interference problem when the rear de-mister is on (e92).
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