Hi, my name is***** your mechanic automotive expert, and I will be happy to assist you today. I apologize for any delay.
Dear customer, what happens is that there are circuits that go directly to the fuse box, but not all the wiring reaches the fuse box, let's talk that they go directly to the electrical circuit, these do not cause the fuses to burn.
Surely, the short had to have occurred in one of these wiring, so the vehicle failed to cut the power.
You could try to refer it to the BMW, but it is not 100% certain that they can make you fulfill any guarantee, the truth is that this would be a matter of contract laws rather than mechanical failure, but my experience has never seen a case, in which the dealership becomes responsible for a vehicle after 2 years, the maximum is that the insurance does respond against this kind of accident but you must have the vehicle insurance.
Do you understand me, dear customer?
My goal is to give you the best advise i can, therefore please do not doubt to ask if you have any doubt or if there is anything else i can help you with.
Kind regards, Sebastian.