No TCU/MULF Trunk

[fastgoat]

I purchased a 2011 135i coupe a few months back (non-nav & non-idrive). The car has Bluetooth and the auxiliary input, but neither work. I also keep getting an SOS error.

I jumped into the trunk recently only to find I have all of the wires for a MULF, but no actual unit. The radio, XM, and key fob all work without issue, so I'm a bit confused how the entire unit is gone but still has some functionality. It does look like two loops have been used on the green/black wire looms.

I suppose my question is, would there ever be a reason the car would come without this module?

[fastgoat]

Well, I've installed a TCU box and the bluetooth works again. However, my AUX and USB still don't work. I have all of the wiring for a MULF2 in the trunk, is the MULF2 required to run the AUX/USB? Or should I be hunting down a different issue now?

Car was optioned with AUX/USB.

[Captain Confused]

Originally Posted by fastgoat

Well, I've installed a TCU box and the bluetooth works again. However, my AUX and USB still don't work. I have all of the wiring for a MULF2 in the trunk, is the MULF2 required to run the AUX/USB? Or should I be hunting down a different issue now?

Car was optioned with AUX/USB.

Sounds like the previous owner took out those modules.

Yes like the TCU you'll need the Mulf2 installed to run the usb and aux