BCM location?

I own a 2006 300c with a 2.7L V6 engine and rear wheel drive. Bought the car in mid-January 2026 and it had a completely dead battery when we went to start it. Connected the jump leads and everything lit up as it should. All the lights on the dashboard for the exterior lighting. Electric windows, electric mirrors, locks, interior fan and all other electrical equipment in the car. What didn't work at the time was adjusting the driver's seat and steering wheel. It didn't feel that extremely important at the time. Before I continue, I just want to add that I live in Sweden and being able to get parts for US cars is not really a problem. The problem is the cost of these parts. Imagine that a front bumper costs about $250 but then there is shipping of about $850 and between 4 to 6 weeks delivery time. Back to the car. After the battery had absorbed some power, I tried starting the engine, and it started right away and without any strange things. It was kept running with the help of a booster. Disconnected the booster and measured the charge, it shows 14.5v which in my opinion was good. Took the car for a spin and everything felt good except for a couple of minor things that didn't work. 1, automatic light did not come on, you had to turn on the light yourself. 2, the driver's seat and steering wheel still could not be adjusted. 3, ABS ECS and one more light, in the lower right corner of cluster. Have heard about that they should go out after a while of using the car. I take the opportunity to read the fault codes which gives U0140. It's been 3 months and two different workshops later and I still haven't been able to figure out how to get rid of this error code? The problem in Sweden is that it is almost impossible to find someone who programs these older cars. And I'm talking about pretty much all "older" US cars. So now to the real question: where is the BCM module located? I've received several different offers when I googled. Under the steering wheel, behind the glove compartment, in the middle of the dashboard. Also received offers that say FCM is the same thing, which in the next search is completely dismissed. I personally think it's the module that sits on the right wheel arch facing the passenger. This module is most reminiscent of a module that is interconnected with most of the other components in the car. If that's true, what should I check extra carefully that could cause this error code? And another quick question: what do I need to be able to program, erase, update and check the older cars here at home, as I said, it is almost impossible to find someone who does this.