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Modern BMW's use a CANBUS system that operates with a number of relays. The days of simply tapping into a 12v hot lead are gone. Best to run a wire to the fusebox and power off that. If that's too long a run, then use a 12v test light to probe wires to see if you can find one that will give you a hot lead when the ignition switch is "ON". Most will not.
Good luck
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