BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > AUDIO/VIDEO + BLUETOOTH + Electronics/Alarm/Software > Help! No sound or chimes! Everything looks fine

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      01-09-2021, 01:07 AM   #23
tmo24's Avatar

Drives: 2007 BMW 335i e92
Join Date: Aug 2010
Location: Las Vegas

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I had the same problem on my 07 e92 with Logic7. The professional head unit had lights and controls etc but zero sound, no matter the input. I also have an 07 e90 with logic7 so I decided to swap the head units to see if it made a difference. It worked fine after the swap and the other car had the same issue so I ruled it out to be a bad head unit. I did a VIN search to see that I had the S677 hifi system. I didn't have bluetooth telephone or USB in the center console. So I actually went to ebay and found one that displayed the VIN. I ran a search on it and it also had S677 but with bluetooth telephone and the factory USB in the center. I installed it and the audio worked fine, had the logic 7 EQ, gave me bluetooth telephone (I guess I had the module but it wasn't coded?) and then installed a MOST adaptor and it worked without having to code it. Food for thought. It was like $70 shipped. It might be worth it to try to see if you can swap with a buddy who has the same head unit. Its about a 2 minute swap total including taking a drink of beer. I could be way off base with your issue but I wouldn't rule it out.
2007 335i Jet Black e92 6AT - muffler delete, MHD, XHP, Koni orange/Eibachs, some other stuff

2007 335i Jet Black e90 6MT - Eibachs, magnaflow exhaust, carbon hood, short shift kit, some other random stuff - being sold somewhere sometime soon probably

2010 335i AW e90 6 AT Msport - The GF took this one over... JB4, PE exhaust, Koni yellows/Eibachs, pink badges, fuzzy steering wheel cover ?
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      01-09-2021, 12:13 PM   #24
Lieutenant General

Drives: 325xi 06 wagon MT
Join Date: Jan 2010
Location: Santa Cruz, Ca

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It's important that the terminology be kept straight because it's already confusing

Stereo = base system = no amp
Hi Fi = 6 channel analog amp with analog inputs = 676
Top Hi Fi = Logic 7 = 9 channel amp with optical inputs = 677 and 688
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      01-22-2021, 04:22 PM   #25
TboneS54's Avatar

Drives: 2004 E46 M3, 2012 E82 128i
Join Date: Nov 2009
Location: SoCal

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So with more help from elec eng friend, we used a laptop and a cut up pair of headphones with 3.5mm jack to test both output of headunit and fed a 400hz tone to the amp (just one channel - amp/speaker worked fine). Headunit output was dead. Wiring, battery, amp, speakers all fine.

Put in another headunit, one just like mine with blutooth, usb, aux, and no coding needed - music is back!

In the end, had nothing to do with low battery, blown fuses or bad amp... go figure.

When I shake the original headunit, something is loose.
// 2012 TitanSilber 128i Coupe 6MT Slicktop N52 non-sulev Heated manual seats
/// 2004 SilberGrau M3 Coupe 6MT Slicktop zero options ~3100lbs

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