[stinkfoot_e92]

I have logic 7 hifi system (silver amp, center speaker). I did check the designated fuses none were blown.

Swapped head units from my 328 (black amp hifi?), still no sound. Any ideas?

[ctuna]

A Hi fi head unit won't work with L7
Unless you can reprogram it for the fiberoptic interface.

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
http://www.google.com/url?sa=t&rct=j...,d.cGU&cad=rja
http://www.musicarnw.com/page-2/
http://www.e90post.com/forums/attach...4&d=1278871872

The head unit is the thing least likely to fail when there is no sound.
Except for in the base stereo system.

Anything in the most loop can stop sound in an L7 system
the most likly thing is the L7 amp , next would be TCU or Mulf.
If the battery is low or the ibs is defective that can also turn off
sound.
See the google thread on the electrical system to read about IBS.

A code read from an BMW scanner may tell you something.