Sounds a bit strange that both positions (Terminal R and Terminal 15) on the ignition switch would fail simultaneously but of course it's possible. You can check the voltage on fuse box rail side connectors

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E39 530dA -02 M-Sport Messing metallic
E53 X5 3.0dA -06 Sport Stratus grey
E70 X5 40d -12 M-Sport Space grey