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BMW 3-Series (E90 E92) Forum
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E91 with no sound (and missing equipment??) - Update: Now solved...
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11-07-2023, 06:14 PM | #1 |
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E91 with no sound (and missing equipment??) - Update: Now solved...
Issue solved, it was a missing center channel speaker. See post #13 below....
__________________________________________________ ___________________ Hi all, I recently got myself a project e91 (2006 325xi). She has had a hard life, and has a long list of items to fix. Currently she has no audio. the head-unit turns on, but nothing from speakers. The seller mentioned some part needed to be replaced in the back. I presumed I could do that optic cable loop trick to fix the MOST setup. Nope, it looks like it is just outright missing any components in the trunk. Questions/ options: - I presume something is missing in the trunk? - Can I just get one of the Android head units for the e9x, or will it still require some sort of amp in the back? - If I need to buy something for the back, what the code/ name of the device? Thank you Last edited by Blixem; 12-08-2023 at 11:52 AM.. |
11-08-2023, 03:32 AM | #2 |
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A US E91 comes with option 676 or 677 for amp and speakers.
A Canadian E91 may come with the base system which is no amp and no tweeters. The part you are looking at in the Trunk is where the SAT module left blank spot and TCU right with disconnected bundle of wires would be . First job is to find out what the car came with. RUN MEDECODER.COM Run Mdecoder.com on your Vin and look in the 6XX range for the stereo options . Lack of the two option listed 676 or 677 indicates the base system. The unplugged bundlle of wires is for the TCU telephone control unit. Since the TCU is no longer supported due to telephone system not using 2g anymore there is no need to replace it with another TCU . You could replace it with Mulf 2 Hi and do some programming this would give you USB or a Mr12volt module could give you usb , sd card , streaming bluetooth music , phone and another AUX. Some programming will be necessary to make this work . TCU can be bypassed with a Most Loop jumper this may bring the audio back if you have a 677 option top Hi Fi in which the Amp is and element in the Most Loop. Most Loop jumpers are cheap on Amazon. If you have a system with the factory amp it is located behind the US drivers side rear wheel well. Read all the links first please. 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.e90post.com/forums/attach...1&d=1209780865 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.e90post.com/forums/attach...1&d=1209780605 http://www.e90post.com/forums/showthread.php?t=641323 http://www.e90post.com/forums/attach...4&d=1278871872 http://www.e90post.com/forums/showthread.php?t=343673 https://www.bimmerfest.com/threads/e...n-752.1275694/ base system wiring pre/post 3/09 https://www.google.com/url?sa=t&rct=...tDpLJPcGkw_ui_ Base System Guide http://www.e90post.com/forums/attach...5&d=1493273253 TCU being absent could cause SOS errors. The TCU is the SOS error system plus runs the bluetooth cell phone connection . The error can be programmed out. Last edited by ctuna; 11-08-2023 at 04:02 AM.. |
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11-08-2023, 10:49 AM | #3 | |
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Retrofits: Harman Kardon, High-beam assistant, Removable tow hitch. Auto-dim folding exterior mirrors. Lumbar support. Perfomance Brakes. |
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11-08-2023, 10:58 PM | #4 | |
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So it appears that I have the 677 option. At least I know where to start and what to aim for. |
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11-08-2023, 11:02 PM | #5 | |
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Much appreciate the help. |
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11-09-2023, 02:28 AM | #6 |
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ok, we see that amp probably got some water
so you need to check amp fuse, fusebox located behind passenger glovebox there is a door which is opened when glovebox is open and fusebox contain red tool to insert and remove fuses, there are also spare fuses if fuse is ok or you'll replace it, then check if sound will work, if not - you need to swap amp and code it to your car body type
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E81 2007 130i 6cylinder Montego blue
Retrofits: Harman Kardon, High-beam assistant, Removable tow hitch. Auto-dim folding exterior mirrors. Lumbar support. Perfomance Brakes. |
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11-30-2023, 12:20 AM | #10 |
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OK, an update...
Looking inside the AMP I noticed the red and orange lights flashing on and off slowly. So this tells me that it had power, but had an error. I also noticed light coming out the fiber optic cable back at the front of the car, so the optic signal was not being interrupted. So I deduced that the amp was damaged. I went and bought another amp from a salvage yard a couple of days ago. I plugged it in, and got audio! YAY!! And then 20seconds later the audio stopped, and the "new" amp also flashed the red and orange LED's, telling me that this also had an issue. So I was starting to suspect there was something wrong with the car. I checked continuity on each of the speaker twisted pairs. The Brown/black and white/black twisted pair does not have continuity. Based on the diagram posted above, this appears to be the center channel speaker. So that is where I will focus my efforts going forward (unless anybody else has a better plan?) |
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12-06-2023, 12:11 PM | #13 |
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I was able to source a replacement (2nd hand) center speaker. This is all that was needed for the system run.
So in conclusion, do continuity tests on all your channels. It appears that the amp won't work if some of the speakers are not working/ connected. Thanks everybody for the info. I could not have cleared this issue without your support. (anybody in Vancouver BC area need to buy a working Logic7 amp?) |
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