Tomguy, thanks for the reply. To further clarify:

All my doors (with the exception of the sticky one) do work with the engine off, at least in part. After I turn off the engine the doors will lock when I lock the driver's door. It's only when I try to unlock them with the engine off that they won't unlock.

As I'm typing this I just remembered that I tested the vacuum system when I was installing the pin by pushing the vacuum pin on the driver's door in and out several times and all the doors locked and unlocked (the engine was off) perfectly. I'm starting to wonder if I did something to that one vacuum. I'm gonna check it tomorrow!

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1972 280SE 4.5 Dark Green, Cognac. Pics!
2014 Range Rover Sport Supercharged. Santorini Black, Dynamic Package, Front Climate Comfort and Visibility Package, Vision and Convenience Package.

Gone But Not Forgotten
2010 Explorer Limited, 2010 R350 4MATIC, 2011 Jeep Grand Cherokee Overland, 2009 Audi A4 Cabriolet, 2009 Ford Flex, 2008 Mercedes-Benz ML350, 2008 Mercedes-Benz E350, 2007 Mercedes-Benz C230, 2005 BMW X5.