Check the voltage or use a test light at the underhood connector, battery, emergency disconnect and breakout connection box in the trunk. Do head lights work? and stay on while trying to crank?

Change out the ignition switch?

No I don't have a spare to swap out. I didn't realize it was the same switch across e53 and e46 otherwise I would have yanked it out of my old parts car just to have a spare.

-Yep-
As a bmw owner (older models) it's a must to collect parts that are highly prone for sudden failure.[emoji106]