i was always wondering if there was a power source and i guess it's in the stage 2. I'm assuming that with the power and ground that it is in fact a separate hardware that needs power whereas the stage 1 doesn't.
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F85 (17) - DG/AB
F87 6MT (20) - Comp - BSM
F80 DCT (18) - Comp - AW
F30 6MT 335i - EBII
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