Had some time to troubleshoot this weekend.

I was wrong about the previous setup, the USB, AUX, and bluetooth antenna plug in directly to the MULF2 in the rear of the car. I tested connectivity of each of the cables of the AUX plug to the back of the car and all work fine (bridged the cables on the back and tested continuity with a mini-din cable plugged in and a tester).

So the problem lies from the MULF onward. Software related? is there a way to restore the CIC to Factory defaults? could having the aux cable plugged in cause a short that has damaged the MULF?

going nuts here!!