Check the positive cable in the engine bay. There's a connection that likes to corrode/break near the electronics box and causes all sorts of havoc on the electrical system. Also check the grounding strap under the car, it's bare copper and tends to corrode and break as well...
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2012 BMW 328i 6-Speed Wagon | Deep Sea Blue with Grey Dakota Leather | Manual Swap, 330i Intake + Tune, 3.15 Helical LSD, Öhlins R&T
(SOLD) 2009 BMW 128i 6-Speed Coupé | Monaco Blue with Black Sensatec | chris_flies' 128i thread
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