One problem related to battery cable has been reported for the 2006 BMW 5 Series. The most recently reported issues are listed below.
Since 2011, I have needed to have my, 2006 BMW 530xi, vehicle serviced. Serviced for trunk leakage, battery cable replacement, sunroof/moonroof non-drainage issues and passenger airbag sensor issues. I have paid perhaps three - to five thousand dollars for alleged repairs. None of those repairs were permanent and the issues continued on/off until 5/10/14. On that day/date I drove the car several hours shopping and preparing for mother's day. When I stopped the engine in my driveway the car shut off but I could not remove the key fob from the ignition. There was no power throughout the vehicle, e. G. No dash lighting, no internal lighting, no alarm light flashing and no ability to lock doors or open the trunk. Neither BMW-n. A. Nor dealership accept any responsibility for the water leakage or other repair issues, even though some manufacturer recalls were announced to the public for these issues, those were said to me to be only for specified VIN numbered vehicles and not mine. I would like to participate in a class action against BMW for these issues and I have saved all my repair receipts to validate my vehicle problems.