Harman Becker Radio Tuner
 

I have a Harman Becker Radio Tuner part number 4G0 035 082 C. It's faulty and has been draining my battery. I bypassed it with an optical fiber loop, but the sound system seems to be controlled by the tuner and doesn't work. My car is a 2012 Q5 V6 3.2 L, Premium Plus.
I really don't listen to the radio because of ads and redundancy of tunes. Is there a way the tuner can be eliminated from the MOST and keep other MOST functions, including sound and hands-free telephone?