Thanks Asif,
In the meantime i borrowed a Bosch diagnostic tool and got a fault code from the impulse ring in the wheel bearing. I eraised the fault code and made a test drive. After a 100 mtrs the abs light went on so I decided to replace the bearing. With a new bearing installed I was on my way to the Renault dealer to eraise the fault code and turn the abs light of, but after a few km the abs light turned off itself so for this problem I didn´t need any diagnostic tool to clear the the memory.
Peter Tillman, December 2008