Hello, i have a BM54 radio professional module in my bmw x5, the fault with the unit is that it draws 2,4 Ah and hour with the car locked and turned off.

Same problem as you described, was in my car because a faulty radio module, i had it to a bmw shop and they concluded.

Try disconnecting the radio module and measure it again?
If not you can try to disconnect the navi display, many cars have electric loss there.

Best regards from norway.