And also I found one electrical socket, which is missing the solenoid valve. It is at the front of the shockabsorber mounting. i assume it is connected to the E/S switch at the center console (haven't remove the center console panel, tnx Mattman).
I will check the connection between the two cable.
See picture 2..... . I have to appologize about the late response because of the time difference and because I have to borrow the digital camera. Thank you for your reply Mick J.