[ctuna]

Do you have the usb option 6fl.
If you do there is another module called the mulf 2 hi
hidden under the TCU on the right which also has a
Mulf connection that need to be jumped out.
Also there is a most port test point at the panel under the steering
wheel . That has another jumper sometimes people working
on the car forget to plug that in . (pictures shown in links)
The Leds on the amp also will tell you if the Most loop is intact
to it. .(see last link on page)
Head Unit changed out by previous owner and not programmed to
Logic 7 ? Head Unit Bad ?
You can check basic functions on the Most Line by shinning a flashligt in on end and
seeing it come out the other . (the fibers themselves )

If you have a car made up to and including 09 you will have
pre wiring which means there will be extra wiring and connectors
lying around such as another most cable going to the amp area.

Logic 7
https://www.e90post.com/forums/showthread.php?t=1056432
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

new link for logic 7 leds
https://www.bavlogic.com/?tag=loop