[Wind90]

Hello everyone.
I have a 2010 E90 328i. I've encountered an issue where my Aux port works inconsistently. For example, it may work fine for three days, and then for several days it doesn't work. Or it might work fine today, but after I go to the store, turn off the car, and return, it stops working. When it works, it works perfect without any interruptions, so I don't think the issue is with the cable, the port, or the wiring.

When it doesn't work, there’s no checkmark left to it. Normally, when it’s working, I can see a checkmark to the left of the AUX label on the screen. Also, the volume is locked near zero. Additionally, I noticed that when I turn on the ignition, and it’s a “lucky day,” above the “Aux front” text, where the USB label is, I see a "initializing" message for a few seconds, and only after that does it change to “Not Connected.” On an “unlucky day” when the aux isn’t going to work, the screen immediately shows “Not Connected” without the initialization.

I've read some forum threads on similar issues, and some people found the problem to be with the MULF or MULF2 module. But the thing is, I don’t have this module. In the trunk, where the MULF should be, I have another module called TCU. Could it be causing the issue? Meanwhile, Bluetooth and radio and CD is working consistently and without any problems.

Thanks for reading and hepling.

Video:
https://www.youtube.com/shorts/xrAT0mmXauc