Aux and USB not working

[mchang]

I have tried to read all the threads on this, but very few come to resolution. Sorry if this is an old issue.

Just picked up an 2008 E90 M3 and found that the aux and center console usb don't seem to be working. Symptoms:
* In the CCC, AUX is greyed out in the Entertainment section
* No power out of the center console USB port

The car has the following relevant options:
S6FL USB/Audio Interface
S752 Individual Audio System
S639 Preparation F Mobile Phone Cpl. USA/CDN
S653 High Definition Radio

Bluetooth functions fine (can make calls), no SOS errors. No apparent other errors.

Questions:
* I checked some fuses, but I really didn't know which ones
* Should I check connections for the MULF-HI in the trunk? Just unbolt and remove?
* Is there a set of steps to diagnose?
* Will this reveal itself with the appropriate scanning tools (e.g. at a dealership)?

Thanks. I *need* streaming music from my phone to be sane .

[RocketyMan]

You still having this issue? The MULF would be responsible for the USB and AUX I believe.