[s2kvee]

I recently purchased a used e90 m3 off auction.. the previous owner, removed the logic 7 amplifier out of the car. I have no audio coming out of the speakers.... DUHH.. but i dont have an option to switch between AM/FM Radio or Aux or Bluetooth. Only CD / DVD options are selectable.

AUX, Radio FM / AM are Grey'ed out and unresponsive when selected... would the logic 7 amp be the reason for this? or is there another module which controls it..

[ctuna]

No amplifier = no audio why would you expect anything different.
Since the Most Bus is used for both audio and other digital communication
a host of other problems could pop up.
Bluetooth is on another module in cars before 2010.
Most bus modules are the Radio or idrive , TCU bluetooth, BMW SOS, ipod,
and PDC may be effected since it works through the Radio or idrive and amp.
Read about the Most bus in the first electrical pdf.

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/showthread.php?t=343673
http://www.e90post.com/forums/showthread.php?t=138949
http://www.e90post.com/forums/attach...1&d=1209780605
http://www.e90post.com/forums/showthread.php?t=641323
http://bmwcoders.com/forum/3-er-8/bm...1-e92-e93-291/
http://www.e90post.com/forums/attach...1&d=1209780865
electical e90 pdf
http://www.google.com/url?sa=t&rct=j...,d.cGU&cad=rja
http://www.google.com/url?sa=t&rct=j...85464276,d.cGU
http://www.google.com/url?sa=t&rct=j...85464276,d.cGU
http://www.musicarnw.com/page-2/
http://www.e90post.com/forums/attach...4&d=1278871872

You might be able to find a used L7 amp on ebay if you want to restore
the original system.
Also you didn't specify if this has idrive/nav or pro radio .
There is what is called a most jumper you might insert in the amp position to
see if it makes a difference. When the amps go bad people have mostly reported
just no sound.