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BMW E46 3 Series 1999 -2004 (323i, 325i/xi, 328i, 330i/xi, M3, conv, sport wagon) Radio reception


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Last Post: May 23, 2019 4:34 AM Last Post By: james1bondela1
scoutmstr

Posts: 2
Registered: 12/09/03
Radio reception
Posted: Feb 24, 2004 3:18 PM
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I get very poor AM radio reception. The static increases or changes when:
1. engine is running
2. as the theatre lighting dims when the door is closed

I believe it is EMI interference or a ground loop problem but don't understand the wiring enough to hook into it. I can't find problem solving techniques in the Bentley book for this situation.
scoutmstr

Posts: 2
Registered: 12/09/03
Re: Radio reception
Posted: Mar 10, 2004 12:36 PM   in response to: scoutmstr in response to: scoutmstr
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I found that by grounding the radio directly the interference stops when the car is off. However I still have interference when the car is running. It doesn't appear to be RPM related. Does anybody have any thoughts.
FieroMGDriver

Posts: 1
Registered: 12/24/04
Re: Radio reception
Posted: Dec 24, 2004 1:06 PM   in response to: scoutmstr in response to: scoutmstr
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I just purchased a 2001 325i, and the FM reception suffers when the rear defroster is on. I know the radio antenna is tied into the rear window, but should it produce poor reception?
Captcb

Posts: 3
Registered: 10/18/04
Re: Radio reception
Posted: Mar 21, 2005 11:04 AM   in response to: FieroMGDriver in response to: FieroMGDriver
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I have a 2000 323i that I just put in a new Alpine head unit. The AM and FM reception is still degraded greatly when the defroster / defogger is on, but I thought I only reconnected the FM antenna and left the cable that I thought was the AM laying unconnected. So I have to question what that rougue cable is as it doesn't seem to affect anything negatively. MAybe that was the cable from my steering wheel controls and the FM and AM share the same antenna connection to the HU. Either way, I'm thinking that if I disconnect the AM from the rear defroster / defogger, then I'll have cut the link between it and the two radio band circuits. Does anyone think I'll be able to put a replacement AM antenna somewhere on the car (By the license plate? to alleviate this problem? I spoke to a dealer and they wanted to replace the rear window. No money for that job...
I'd appreciate any help. Thanks!
felix2

Posts: 290
Registered: 02/12/04
Re: Radio reception
Posted: Mar 21, 2005 3:01 PM   in response to: Captcb in response to: Captcb
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If you've installed a new head unit make sure that it's providing power to the antenna amplifier power input wire.

I believe there is a TSB on loose connections at the antenna amplifier. You might want to pull off the left C pillar trim and make sure all connections are good.
Captcb

Posts: 3
Registered: 10/18/04
Re: Radio reception
Posted: Mar 22, 2005 7:19 PM   in response to: felix2 in response to: felix2
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THanks Felix,
I did check that and the problem is no worse than before I changed the HU. In fact my AM reception has improved, but the defroster will still wipe out Am and degrade FM when I turn it on.
james1bondela1

Posts: 2
Registered: 05/23/19
Re: Radio reception
Posted: May 23, 2019 4:33 AM   in response to: scoutmstr in response to: scoutmstr
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Thanks for the information. I would appreciate if you check this website for theatre art information.
One 2 Theatre

Edited by: james1bondela1 on May 23, 2019 4:34 AM

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