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      06-17-2017, 12:59 AM   #1
BimmerNugget
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2011 328i rear speakers not working

Hello!

I have a 2011 328i with the base stereo system (no iDrive or HK). From what I've read online, the car has a total of 6 speakers (2 on the front doors, 2 under each front seat, and 2 on the rear deck). Everything works 100% ok, radio works, AUX port works, and USB port works. My only problem is that the 2 speakers in the rear deck behind the head rests do not work at all.

I have tested it using the "fader", when it's set to the rear speakers, there is no sound at all. The front door speakers work fine.

Can anyone help me out with this? Is there a speaker fuse that blown? I've checked the fuse diagram and it does not look like there is any speaker fuse on there. Also, this base model speaker system does not have an amplifier.
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      06-17-2017, 12:03 PM   #2
BimmerNugget
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Does anyone have a clue??
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      06-17-2017, 01:00 PM   #3
ctuna
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We are dealing with two speakers the rear channels and the wiring in between
and maybe the combox. So to test the speakers is not a hard task take them out measure for resistance and run a signal through them . Sounds like the rear two channels your Head Unit may be dead though. Since the alarms are run through the rear speakers on some years if you have pdc something may be wrong with that.
The head unit has a fuse but there are no fuses for the speakers . If the head unit fuse was out you wouldn't have any Radio at all.
Did you just buy this car if you did maybe someone else has already modified it?

Last edited by ctuna; 06-17-2017 at 05:56 PM.
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      06-17-2017, 06:01 PM   #4
BimmerNugget
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ctuna Thanks for the reply. The previous owner bought the car as a CPO, it was a female college age driver. I highly doubt she fiddled around with the sound system wiring.

How exactly can I test the rear speaker resistance? Sorry, I do not know much about sound systems or electrical work in general. Any help is appreciated.
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      06-17-2017, 07:16 PM   #5
ctuna
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BMW stereo types
http://www.e90post.com/forums/showthread.php?t=352586
http://www.e90post.com/forums/attach...2&d=1266451970
http://www.e90post.com/forums/attach...2&d=1260829447
http://www.bmwmotorsports.org/pdf/e7...%20Systems.pdf
http://www.e90post.com/forums<br /> ...d.php?t=343673
http://www.e90post.com/forums/showthread.php?t=138949
http://www.e90post.com/forums/attach...1&d=1209780605
http://www.e90post.com/forums/attach...1&d=1209780865
http://www.e90post.com/forums/showthread.php?t=641323
http://bmwcoders.com/forum/3-er-8/bm...1-e92-e93-291/
http://technicpnp.com/menuDiagrams/d...e90_92_93.html
http://www.musicarnw.com/page-2/
http://www.e90post.com/forums/attach...3&d=1169133185
http://www.bmwmotorsports.org/BMW_docs/mostbus.pdf
http://www.e90post.com/forums/attach...4&d=1278871872

Perhaps you should find somebody in your area to help you .
Otherwise you will have to obtain an learn to use
a volt ohm meter . You should probably be able to see the underside of the speakers on the trunk ceiling You could try reading the ohms and AC Volts and at least see if they are connected visually by looking at them.
Bad idea to assume anything measure and figure it out. People really don't like that system and will try to modify it.

Last edited by ctuna; 06-17-2017 at 11:15 PM.
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      06-17-2017, 10:25 PM   #6
BimmerNugget
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Thanks ctuna ! I took off the rear speakers and discovered that the disc magnet had become detached from the speaker assembly. Speakers obviously will not work without the magnet.

I hot glued the magnet back on and the rear speakers work great now.
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      06-17-2017, 11:04 PM   #7
ctuna
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Good job.
You might want to get some new/used OEM ones off ebay or the buy and sell
board here if you continue to have problems.
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