Problem solved.
On each side where the wires for the motors are, I found 2 plug/connectors which looked similar to the plugs/connectors which appear at the back for the tail gate swicthes.
So I just plugged 2 extra switches in these (1 per side) and now it works. Must be so that the circuit is complete or something.

So even though I cant have the roof controls/switches because I have a pan roof, I still needed to plug the switches in. So now I have 4 swicthes in total, 2 which are hidden. 2 which are near the tail gate