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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E90/E91/E92/E93 (2006 - 2013)

E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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  #1  
Old 04-16-2014, 12:12 AM
mikeholbo mikeholbo is offline
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Location: Swindon, UK
 
Join Date: Apr 2014
Posts: 6
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 offline
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Location: usa
 
Join Date: Jan 2010
Posts: 2,217
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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Location: Swindon, UK
 
Join Date: Apr 2014
Posts: 6
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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