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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 06-05-2012, 09:32 PM
bogeyorpar bogeyorpar is offline
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Help: Audio system has no sound

My car is a BMW 2006 330i 4 door sedan. A few days ago, suddenly the audio system stopped working. I can still turn on radio, CD, Satellite, Aux, and the screen works (shows channel or CD track#), but no sound comes out of it. It seems like something muted it. However, I can't find any button or menu item to mute/unmute. Any guidance on how to diagnose and fix the issue?

Another maybe unrelated issue: the muting happens right after I took the car to Costco tire center for a tire rotation. Is it possible during tire rotation they accidentally cut some wire?
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  #2  
Old 06-06-2012, 12:00 AM
gcreese gcreese is offline
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Press the volume button. That mutes/unmutes it. My guess is the installers didn't like your choice of music.
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  #3  
Old 06-06-2012, 11:28 AM
bogeyorpar bogeyorpar is offline
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gcreese, pressing the volume button on my car will just turn the audio on/off, but when it's on, still no sound. Is there a trick, like you have to press and hold the button for 5 seconds or something?
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  #4  
Old 06-06-2012, 12:23 PM
gcreese gcreese is offline
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Quote:
Originally Posted by bogeyorpar View Post
gcreese, pressing the volume button on my car will just turn the audio on/off, but when it's on, still no sound. Is there a trick, like you have to press and hold the button for 5 seconds or something?
I don't think so. I just press the button and the sound goes on, press it again, the sound goes off. My BMWs are newer, but I wouldn't think things would change that much. The only other thing I can think of is that they turned the volume completely down and then hit mute. What does the car manual say?
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  #5  
Old 06-06-2012, 01:09 PM
bogeyorpar bogeyorpar is offline
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Do you have iDrive? I looked at the iDrive manual and there is mute on/off options.

My car doesn't have iDrive, and the user manual does not say anything about muting the speakers.
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  #6  
Old 06-06-2012, 02:09 PM
Matrixolution Matrixolution is offline
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Quote:
Originally Posted by gcreese View Post
Press the volume button. That mutes/unmutes it. My guess is the installers didn't like your choice of music.
I think that's the on/off button on my 2011 328.
There is no mute button on mine.

Correct me if i'm wrong.
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  #7  
Old 06-06-2012, 08:08 PM
gcreese gcreese is offline
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Yes, I have iDrive on both my cars.
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  #8  
Old 06-07-2012, 02:24 AM
gcreese gcreese is offline
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And yes, that's the on/off button. OK, my thoughts didn't work. At this point, I have no idea.
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  #9  
Old 06-08-2012, 12:07 PM
ufoj ufoj is offline
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I've had this problem. Dealer explained to me once that it is sometimes caused by paired bluetooth phones aggravating the software, presumably getting stuck in some kind of loop. If you have a phone, can you unpair it, delete it, and see if it goes away?

The other time i fixed this, I just pulled and reinserted the radio fuses in the glovebox and that was enough to "reboot" the stereo.
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  #10  
Old 06-08-2012, 06:01 PM
bogeyorpar bogeyorpar is offline
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ufoj, I deleted all bluetooth devices, but still no sound. Next I'll try the fuses.

On the fuse box cover sheet, I found a symbol that looks like radio, and there are 3 fuses listed. Are resetting these 3 enough? Is there a different fuse for the amplifier?
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  #11  
Old 06-08-2012, 06:27 PM
ufoj ufoj is offline
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I'd try those, it's not going to hurt much anyway. I don't remember exactly, but I have an 09 328, so it might be different.

Does your door gong/chime still work? Or are you getting no sound anywhere?

Also, once this happened and I ignored it and the next morning it was fine. So um, go figure.
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  #12  
Old 06-08-2012, 11:50 PM
bogeyorpar bogeyorpar is offline
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I have no sounds anywhere, except the warning sounds if I left my key fob in the car and opened the door.

The fuse box is in such a bad location that I can hardly reach any of the fuses and I can't see the fuse when my hand reaches in. I'm afraid if I pull one off I can never put it back in again ... any good tools to use?
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  #13  
Old 06-09-2012, 11:38 AM
Manybrews Manybrews is offline
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No sound has two possibilities.
1)software, or
2)hardware.
You could have BMW update the software on the car and see if that fixes it.
If not, it's likely a hardware failure. I didn't see if you have the I drive, or just the radio.
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  #14  
Old 07-14-2015, 12:18 PM
F07530D F07530D is offline
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I sufferred the same problem for about 3 years. After trying to find connection between the problem and potential reason i finally find out that is relating to amount of load in my trunk.
It was lika starting the car with no sound, next start everything working fine, after next start nothing etc.... sometimes it lasts for a week or two, then just start working once, and another few days without sound.
Fault memory was showing AMP int fault or/and AMP overvoltage. Deleting the fault was the cure, but it was really annoing driving 1hr to connect car to the service computer without any guarrantie that it will not stop playing the sound until next start.
For 7 months i was driving with a lot of stuff in my trunk and there was no problem, and some time ago i removed everything and..... it started again.
So the only one logic axplanation was that there are some wires not properly connected.
I decided today to go to service but..... it starts working :o but only for this drive.... so later i went to service to clear the fault memory (that always helped).
How suprised i was that after clearing the fault memory still no sound!!!! and after second check - no fault's at all !!!!
I decided that i have to see how it looks this f...ing LOGIC 7 AMP.
I took this out, all the wires looks ok, but still no sound, and then............... i put my finger on the white wire tape visible thru the ventilation hole and...... just like magic touch..... it starts playing the sound!!!!!!! simple as that. After disassembling the AMP at home, the tape connecting two circut board was U shaped, i changed it to S shape and works fine!!
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  #15  
Old 07-14-2015, 01:48 PM
wilt wilt is offline
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It could be that some liquid spilled in your trunk and it gravitated to the amp location under the floor of the trunk.
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  #16  
Old 08-15-2015, 02:24 PM
Gasman711 Gasman711 is offline
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E90 No sound on Stereo

I had the same thing happen to me. Frustrating as all get out. I was told it was the amplifier and I replaced it with a certified used one and still no sound. Took it a local Car Toys and they installed the new amp and told me to get it flashed at the dealer. Spent $600 already and still no sound. i took it to a BMW repair shop and they said the code was that the radio was not talking to the CCC and had no way to fix it. Took it to another shop and they fixed it, but they said the satellite module was out and that affects the whole system. Another $100 bucks, but they bypassed the satellite module and I have sound, but can't use the BMW assist - oh well, I have a cell phone and sound, so I am a happy camper.
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  #17  
Old 08-15-2015, 02:28 PM
Gasman711 Gasman711 is offline
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Oh, by the way, my old L7 amp was not at fault - if you need one, I will sell you mine as I have already purchased a used one - $500 plus shipping and it's yours. Be sure that your 330i has the upgraded stereo and that the amp says L7 and is silver - it's located under the plastic cover on the drivers side in the trunk.
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  #18  
Old 01-06-2016, 01:48 PM
issue solve issue solve is offline
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sound problem solved mulf unit needs update

Their is a mulf unit that looks like a sound card on a PC located under the carpet in your bmw trunk it needs an update because your bluetooth connect for audio is in sync with your head unit causing your sound to mute or faulty randomly this usuaully happens when u connect newer phones to bluetooth but once you do an update at your dealer your audio sound will be back now your bluetooth is updated for audio and sound for bluetooth enable devices so it don't cause your whole radio to mute but with the update on the mulf unit it should bootup properly and your sound should work again it has nothing to do with your fuses or deck radio it's the mulf unit in back of trunks just needs update this is common in bmw it's not your amp or wiring it's the mulf under your carpet needs update so it can boot up properly for sound and I drive functionality

Last edited by issue solve; 01-06-2016 at 02:17 PM.
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  #19  
Old 08-10-2016, 02:34 AM
SavageMac SavageMac is offline
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Has anyone found a fix for this yet.

I have a 2006 325i with business CD player Bluetooth and Sirius radio. No sound but the radio seems to be functioning properly. However, I my radio is not detecting my Sirius module as in I don't have the option for it on my radio. I've purchased a MOST fiber optic loop to bypass the Bluetooth module with no luck. I can't seem to find an optic loop to bypass the Sirius module. I've also bought a new hiFi amp and still no sound. What options do I have?

Last edited by SavageMac; 08-10-2016 at 02:36 AM. Reason: Add info
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  #20  
Old 08-10-2016, 09:19 AM
wilt wilt is offline
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Quote:
Originally Posted by gcreese View Post
I don't think so. I just press the button and the sound goes on, press it again, the sound goes off. My BMWs are newer, but I wouldn't think things would change that much. The only other thing I can think of is that they turned the volume completely down and then hit mute. What does the car manual say?

I have a 2011...that switch merely turns ON/OFF the POWER! no mute function. From the E90 Radio owner manual (not model year specific)

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  #21  
Old 08-10-2016, 09:26 AM
wilt wilt is offline
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Originally Posted by Gasman711 View Post
Another $100 bucks, but they bypassed the satellite module and I have sound, but can't use the BMW assist - oh well, I have a cell phone and sound, so I am a happy camper.
BMW Assist was somewhat recently discontinued for the E90 (and other series), because it uses a mobile phone protocol which is no longer supported by any mobile phone carriers.
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  #22  
Old 12-27-2016, 04:07 PM
gulo gulo is offline
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Quote:
Originally Posted by ufoj View Post
I've had this problem. Dealer explained to me once that it is sometimes caused by paired bluetooth phones aggravating the software, presumably getting stuck in some kind of loop. If you have a phone, can you unpair it, delete it, and see if it goes away?

The other time i fixed this, I just pulled and reinserted the radio fuses in the glovebox and that was enough to "reboot" the stereo.
Thanks man. This happened to me today, my phone's bluetooth was off and I turned the sound system off, it just won't turn back on, then I found this post, went back the car paired the phone and it turned back on.
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  #23  
Old 12-27-2016, 08:46 PM
wilt wilt is offline
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(delete)

Last edited by wilt; 12-27-2016 at 08:48 PM. Reason: delete
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