Hi guys, I tried searching but no luck.

So i turned off my E53 X5 4.4 and noticed the the fan kept on going....so turned the key back on and realized no lights and buttons were working on the control unit.
Since the fan kept going I unplugged the FSR, I have the checked all the fuses but all good.
Now I just want to make sure before I go spend any money do I need a new control unit or can it be something else?