[Blixem]

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

[ctuna]

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.

[ptpending]

Originally Posted by Blixem

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

check the spacing between rear left wheel arch and rear left lights, here is amp for hifi and top-hifi system located, under the trim

[Blixem]

Originally Posted by ctuna

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 MDECODER.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.

Thank you very much for the info. I have started reading all those links. I was not aware of the VIN decoder. Very cool, thanks.
So it appears that I have the 677 option. At least I know where to start and what to aim for.

[Blixem]

Originally Posted by ptpending

check the spacing between rear left wheel arch and rear left lights, here is amp for hifi and top-hifi system located, under the trim

Thank you for the tip. I didn't realize I could dig deeper. I found an amp!! I will continue along my path.
Much appreciate the help.

[ptpending]

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

[ctuna]

First thing I notice is since you don't have a TCU in the Most Bus Loop
is likly open. This can be fixed with a Most jumper it might bring the
sound back. Most cars come with a TCU maybe yours didn't .
But the cables are usually wrapped in foam at the connection point
for uninstalled options.(If it didn't come with a TCU then this is not
a problem .)
Second thing in regards to the amp is there are diagnostic Led's in the
Amp that can tell you things like is it communicating with the Head
Unit or power and up and down status.

https://www.bavlogic.com/?tag=loop
Amp diagnostic Led in the above one scroll down away's

Read these links to get familiar with the Most Bus and Logic 7 sound system.

Logic 7
https://www.e90post.com/forums/showthread.php?t=1056432
https://www.bavlogic.com/?p=3729
https://www.bavlogic.com/?tag=loop
http://www.bmwlogicseven.com/?p=3837
http://www.bmwgm5.com/
https://www.e90post.com/forums/showt...5#post24455335
http://www.e90post.com/forums/attach...2&d=1260829447
http://www.google.fr/url?sa=t&rct=j&...slMu2A&cad=rjt
https://www.bmwgm5.com/Logic7_E90_91_92_93.htm
http://www.bimmerfest.com/forums/sho...d.php?t=982666

http://www.e90post.com/forums/attach...1&d=1209780605
Most
http://www.e90post.com/forums/showthread.php?t=727663
http://www.e90post.com/forums/showthread.php?t=347222
https://www.google.com/search?q=BMW+...VCkMqy2aCK09M:
http://www.1addicts.com/forums/showt...php?p=19256760
https://www.teacremotes.com/bmwgm5/
Diagnostic Manuals Inpa/Ista D
https://bimmerprofs.com/diagnostics-inpa-part-1/
https://www.google.com/url?sa=t&rct=...7x8H3pN8h1fMuF
https://carmod.ru/files/icom/istad_en.pdf
https://www.e90post.com/forums/showthread.php?t=1681573
https://www.bimmerforums.com/forum/s...-P-actually-do
primary links
https://www.bimmerfest.com/forums/at...9&d=1539905743
https://www.e90post.com/forums/showthread.php?t=1681573
https://www.bimmerfest.com/forums/at...1&d=1590283589
https://www.nathansbmwworkshop.com/b...or-dean-videos
Amp info in the following link.
https://www.e90post.com/forums/showthread.php?t=1144129

You can get used amps on Ebay.

[Blixem]

Dayam, once again you have gone above and beyond.... I appreciate the assistance. Some more reading tonight!

[ctuna]

I would get BMW diagnostics .
If you can get Standard Tools and Ista D both of which where free downloads
and K/D can cable . They are getting harder to get now .
A second choice would be the Pro Tool from bimmergeeks.

Ista D is like a shop manual with guided trouble shooting and a searchable database.

See the coding subforum .

diagnostic manual ista/inpa
https://www.google.com/url?sa=t&rct=...xo19teM9vkTF-C
https://www.google.com/url?sa=t&rct=...7x8H3pN8h1fMuF
https://bimmerprofs.com/diagnostics-inpa-part-1/
https://www.google.com/url?sa=t&rct=...lkXEhlQYy4i9Nb
https://www.bimmerforums.com/forum/s...-P-actually-do
https://www.bimmerfest.com/forums/at...1&d=1590283589
https://www.google.com/url?sa=t&rct=...kBbC27TJLX3BGe
https://www.google.com/url?sa=t&rct=...WekqhcC6hsgK2c
primary links
https://www.e90post.com/forums/showthread.php?t=1681573
https://www.nathansbmwworkshop.com/b...or-dean-videos
ista problems
https://www.e90post.com/forums/showthread.php?t=1661945
https://www.e90post.com/forums/showthread.php?t=1581663
https://www.bimmerfest.com/threads/t...-pdfs.1449540/

[Blixem]

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?)

[Blixem]

And I see now why there was no continuity to the center channel.... The speaker is missing!!!


I guess time to talk the 2nd hand parts guy again

[ctuna]

Have you checked the Battery Voltage?

[Blixem]

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?)