
If you look on the internet there is a possibility that you can find the details in English. Search for "Dialogys" that is the Renault doc.
Corroded connections(there are pictures in my pdf) are a major problem with Renaults over the years, so start with that, is not expensive but time consuming, and might solve your problem.
For now have a nice weekend.
WillemS
In Europe many people scrap their cars, if they find those problems except 25 addicted people they jion and help their friends in forums like this or; http://www.renault25club.nl/ or http://www.renaultforums.co.uk/