You can use the key fob to roll down the window to get in from the driver's side while waiting for the part.

(From experience of course).

You can also use a long 3/16" flat blade screwdriver to poke the DHC cable to open the door. (Say you accidentally shut the driver door with your only key inside)

(Also from experience).

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)