In my case the sensors were the same as in the picture you made. Removing the cover is a bit of a pain. Remove the two screws on the side that is exposed when the passerelle is in the closed postion.
Next remove one of the screws that holds the two halves together at the back of the passerelle.
Now you should be able to remove the wooden slate on the top. In my case it is fixed with some sort of velcro. Now you can acces three screws on the top that loosen the second half. You will need to rotate the passerelle in and out to be able to access all three screws.
The connectors are on top directly under the cover (see enclosed picture).