I'm very surprised BMW doesn't have something available to its customers or technicians.
You have to understand, I have access to everything the BMW techs use. All the online repair info, their parts catalog (where I've ordered nearly 100 assignment cards already)...literally everything BMW provides. I haven't found any single source of explanations for the symbols. It seems very strange.
That's why I came to you guys. I was hoping to be pointed to some obscure corner I hadn't looked in yet. But like I said, there doesn't seem to be anything official. If I manage to create a legend, I'm pretty sure it'll be to the only one on the planet.