It was indeed the lack of oil in the vase. I put some PENTOSIN CHF11 S oil recommended by MOPAR with a syringe.
Everything works now, the roof opens and closes well but I have a leak in one of the cylinders because when I operate the roof, the level of the vas drops. I saw that I have a leak on the cylinder on the right in the trunk.
I will see to have it changed if I find the model.
Thanks for the help you gave me.
Cordially,