Three solutions when locked out of BMW because of dead battery
Regarding being locked out of your BMW because the battery ran down:
1: Check the owners manual for the "emergency unlock" procedure for just this situation. On my 1989 735i, you operate the key in the drivers door in a certain way while holding up on the handle. This engages a mechanical action that unlocks the door. However, on my 735i, this function did not work.
If you can open the trunk, here are two solutions:
1: Jumper 12 volts from another car to the trunk light on your BMW. That should give you enough juice to operate the door locks with the key. Make sure you use the trunk light, which will come "on" whenever the trunk lid is open, allowing the juice to reach back into other circuits. I tried to use the license plate lights, but that didn't work since those lights are only active when the headlights are turned on, that cut the juice off at the headlight switch and so it didn't reach the door locks.
2: Get your wife, child, or other small person to break into the car thru the ski hatch. On my 1989 735i, I was able to knock out the ski hatch cover from inside the trunk, then I was able to undo and remove the rear seat leather arm rest console, then my wife was able to squeeze thru the hatch (be careful of sharp metal edges) and get in the car and operate the door locks manually. Of course, this is a last resort! Also will not work if the double lock has been thrown on the doors the last time you locked them!
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