My wife's 05 4.4.i Sport passenger door was in "dead lock" when most of the power to the door was lost. Fuses were fine, tried removing one of the battery terminals, neither was the cause. Could not operate anything from the driver control or central locking (window, mirror, locks), and worst of all, could not open the passenger door from outside OR inside the vehicle. I knew that I would have to get the door open to make any kind of fix, so with a lot of elbow grease, and moving/reclining the passenger seat as far back (out of the way) as I could, I managed to remove the door panel (there are other great posts on how to remove the door panel). After farting around with the mechanism manually, I realized that it was in some special secure mode, and nothing was going to open it manually. The next move was to remove the cloth tape on the wires leading to the door lock actuator, and strip a bit of insulation back on each of the wires (see pic). This allowed me to apply 12V to the heavier gauge black and brown wires which fired the actuator and the door managed to get out of dead lock (I could not find a schematic, so do this at your own risk!) This allowed me to open the door with a big smile after few hours of swearing off BMW's. Anyway, since the fuses were fine, and so many things lost power, I was suspicious of the connection between the door wiring harness main wiring that can be found where the boot attaches near the door hinges. I opened this up and found 1) 4 pins corroded, 2) one pin corroded badly and broken off in the female end of the plug. A mess. See pic. I am now working on finding a replacement pin (local dealer shows a part number, but they don't have it -- helpful, as usual. Thanks Calgary BMW! They provided another wired lead that I am trying to salvage the pin from. I'll let you know how it goes.

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