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I had this problem recently with my 1990 BMW 520i after I left the lights on and drained the battery. The manual override lock position didn't work on either doors. I was able to unlock the trunk normally. The best solution I found was to use jumper cables attached to a non-running car and then ground the - (black) side to metal in my trunk and touch the + (red) end to the trunk light. The trunk light I'm referring to is in the center on the ceiling of the trunk and has a plastic cover that you'll need to temporarily remove. After connecting power to the light I could tell it was powering by the light bulb illuminating and I had a second person unlock the car. Apparently this method puts enough power in the system to power the locks. I didn't have any blown fuses or other electical problems after accomplishing these steps.
What else can I help you with?
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