Airbox Flap does not open

[ChrisCSL]

Hi!
I just realized that the Airbox lid does not open on my car.
i revved the car in stood still with sport-button activated like in this vid:

http://www.youtube.com/watch?v=6ZMYmoZW2kk

But the lid did not move.
I then extracted the actuator and tested it with external power supply. The actuator works. Then opened and closed the lid manually while measuring the resistance of the throttle valve switch. Resistance changed through the turn. So I think both parts are ok.
I realized, that, when turning on ignition the extracted actuator turns about 3 full circles, then stops. When built in, the actuator tries to turn, but it can't, because it tries to turn via the close-direction, but the lid is closed already.

Anybody has a clue where the error in the system hides?
What can I check next, to make the lid operate?
Chris