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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 04-16-2014, 12:12 AM
mikeholbo mikeholbo is offline
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Location: Swindon, UK
 
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Mein Auto: E91 320D
Constant high pitch noise from all speakers

Morning,

I'm back in a BMW and I have just picked up an E91 320d LCI. Car is fitted with base level stereo system (6 speakers/no amp) and the professional HU. No i-Drive but I do have Bluetooth telephone.

From the moment I put the fob into the ignition to the moment I remove it I am getting a high pitch noise from all 4 mids in the doors (I presume the noise is too high pitch for the woofers).

The noise is irrespective of engine on/off and therefore engine or vehicle speed.

I was thinking maybe electrical interference from the BT unit or maybe a dodgy HU?
Definately not an exhaust flap issue, as I surely dont have one!

Any previous experiences would be appreciated.
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  #2  
Old 04-16-2014, 12:21 AM
ctuna ctuna is online now
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Location: usa
 
Join Date: Jan 2010
Posts: 2,336
Mein Auto: 325xi wagon
e9x stereo forum here

http://www.e90post.com/forums/forumdisplay.php?f=27

It's probably the head unit .
I think there is a TSB for the noise.

http://www.e90post.com/forums/showth...e+system+noise
Read this thread and there is more info in entry 11 in it.

Last edited by ctuna; 04-16-2014 at 12:24 AM.
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  #3  
Old 04-16-2014, 12:38 AM
mikeholbo mikeholbo is offline
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Mein Auto: E91 320D
Thanks. I'll take a look when not at work as message boards are restricted, Bimmerfest works fine though!
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  #4  
Old 08-13-2014, 03:48 AM
patritzio patritzio is offline
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Location: Hertford
 
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Mein Auto: 120d
update?

Did you ever get to the bottom of the high pitch / frequency noise ?

I purchased a 2010 120d yesterday and not long after realised that there was a constant noise. It occurs when you put the key in the dash but before you turn the engine or stereo on. It does not vary with speed or stereo volume but is constant in volume (low) and pitch (high). I have a horribel feeling it may drive me slowly insane

I have spent a little while trawling the web and forums and I think yours is the first description which exactly describes the same issue as mine.

Last edited by patritzio; 08-13-2014 at 03:50 AM.
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  #5  
Old 08-13-2014, 11:48 PM
mikeholbo mikeholbo is offline
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Mein Auto: E91 320D
I did, unfortunately had to replace the head unit. Something like 600 from the dealer but found one on eBay from exactly same spec and year so straight swap, no coding.
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  #6  
Old 08-14-2014, 12:09 AM
patritzio patritzio is offline
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Thanks for your swift response.

If you don't mind, can u tell me which head unit it was, how much u paid on eBay and how much to get it fitted and whether it was by a BMW dealer.

Thanks again.


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  #7  
Old 08-14-2014, 12:13 AM
patritzio patritzio is offline
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Ps. Do you know the issue with the HU. Defective from beginning, water damage?


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  #8  
Old 08-14-2014, 12:27 AM
mikeholbo mikeholbo is offline
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Mein Auto: E91 320D
My Head unit is made by alpine, all specs look the same but have different connections on rear depending on bluetooth, changer, amp etc. paid about 100 for mine, fitted myself in five mins. You can find your stereo info, Google BMW secret menu
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  #9  
Old 08-14-2014, 12:29 AM
mikeholbo mikeholbo is offline
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Don't know the history, didn't spot it on test drive but did a week later.
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  #10  
Old 08-15-2014, 03:38 AM
patritzio patritzio is offline
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Mein Auto: 120d
Thanks Mike. I have the Professional stereo with Bluetooth from a 60 plate. I can see quite a few units on eBay for around 150ish but I am not quite sure what the specific requirements are that I have to look for other than professional stereo E87? I understand for example there are some Alpine units and some other ones from a different manufacturer which may not be as good?

Also, presumably if it is a straight swop for what I need there will be no recoding and easy to install. As I am a total newbie to car audio though is there is a guide for removing and replacing please?

Finally, and apologies for tagging this question on the end but after I hopefully get rid of the noise, can anyone recommend a BMW dealer in herts/Essex/bucks/North London area with reasonable price to supply and fit the alpine speaker package?


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  #11  
Old 08-15-2014, 04:01 AM
mikeholbo mikeholbo is offline
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Mein Auto: E91 320D
Find spec of your car from secret menu or etk, get seller to confirm spec is same as your car, then no coding req'd. Install to e91 was gently pry panel below stereo and undo two screws. Remove connectors, re-install. Probably took me longer to reply to this post than to install it! I thought about the alpine install Dealer wanted 800 installed for what many people say is a poor upgrade. I'm saving up for an aftermarket amp/install
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  #12  
Old 08-15-2014, 04:18 AM
patritzio patritzio is offline
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Mike please bear with me! what particular spec found in the secret menu am I looking for that I need to match? Is it a part number for the stereo unit, the build date, BT etc. I'm just not quite sure exactly what spec needs to match.

Also Most of the professional units on eBay just say E87,E90,E91,E92 and suggest they should plug and play with no recoding. Is that a bit misleading really then?


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  #13  
Old 08-15-2014, 05:04 AM
mikeholbo mikeholbo is offline
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Location: Swindon, UK
 
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Mein Auto: E91 320D
It is misleading to say it WILL plug and play without coding. Your head unit interfaces with the bluetooth, amp, disc changer, DAB tuner, USB interface etc where fitted. Depending on the donor vehicle these options may or may not be coded to the HU or even worse may lack the physical connections on the rear of the HU.

Best thing you can do is go to etk.cc; type in your VIN and determine the spec of your car & stereo. Find a replacement from a PERSON, not a reseller and ask them to confirm they have the same options installed as you do. (I bought mine from an indentical car year,spec,engine,options)

Alternatively, remove your HU take a photo of the rear and compare it to the rear of the HU you intend to purchase. When you fit it you will either a) be lucky and it works straight out of the box or b) pay an indepenet 40 to code it for you!

Either way considerably cheaper than a BMW fix.
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  #14  
Old 08-15-2014, 05:22 AM
patritzio patritzio is offline
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Mike - I genuinely appreciate the advice. If I were in the pub I would have definitely bought you a couple of pints by now!


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