Thanks tighed1
I will do the test with rubberband. i same time I will look if they move or not (in labo test, all works + relay 3 and 4 in same time).
Relay engine (middle relay) give electric power to witch component ?
=> test will be perform tomorrow I hope. At latest, saturday morning
Thanks for your how to repair that I use to controle RCM (what I call K40 from other mercedes forum)

Thanks Padgett

I read this post before, and lot of other. For me, it s not so easy if post are very long to find good key in answer given.
i will try to find wiring diagrams.

Regards

Nicolas