Im just lifting this thread to tell you what the problem was.

In the fingertip armrest there are two big relays, one of these relays should be replaced with a new smaller kind of relay with part nr 9700502400. It comes with a connector that fits into the existing harness.

You can see wich of the relays you should change if you check the cables in the connectors ones you have the new part.

This solved the problem for me!