My E320's have an additional lock wiring connector located inside the foam block that houses the pump. It is a three pin round connector with a single blue wire, a single yellow wire and a single green wire. This connector is the same style as the one that plugs into the pump. My wiring shematics show this connector with the same pin number/wire color combinations referenced in my previous post. If you have this connector, you might be able to get the pin numbers/wire orientation from it. I would just look at mine, but that would require me to remove the pump from my car.....

Let me know if you have this connector...

By the way, what is the model and year of your vehicle?