Ah, a Laguna2 owner! And French! And speaks English!
Have you heard about ddt2000? A computer program, that is similar to CLIP, but it does not need an expensive adapter. I made a serial interface to that and works fine. It is not compatible with the CAN bus.
http://forum.lagunaclub.eu/index.php/topic,92.0.html
You can peep into different computers and set/unset/reset fault codes, settings (e.g. pressure monitoring system, ABS, settings of different methods for servo or windscreen wiper, check the pressure in the climatic compressor, enabling tempomat and many other things).
It is far beyond the OBD2 system! It is Renault- (and Nissan and Dacia) specific! Of course, the Laguna also communcates via OBD2 protocol, but the information you could gain are limited and slow.
If you like to have the program, I could send the link to download, too...
We have a forum (actually, two forums) to discuss the problems about Lagunas. If you need something about it, I can answer or can translate your question. I also read the German lagunaII forum and sometimes the Romanian and the French also, but because the language barrier it is hard to interpret.
But I'd like to know the real meaning of descripitions in ddt2000, because in spite of the English menu, it speaks mainly French.
May I ask you some questions about it? I have a vocabulary, and my wife speaks French a little bit, but she is not familiar with electronic and mechanic expressions.
My laguna is a 2.0 IDE model from 2002, I am quite satisfied despite of the horrifying storyes about that type of engine. OK, in the case of a sophisticated machinery, the risk of fault also increased...
I put my car computer into the glovebox (Epia M10K) and I modified my upper display unit to enclose the 7' LCD. It also displays movies on a 17' LCD on the seat behind, to my daughter. I control it by a PIC that communicates via USB with PC. Both program running are my code. The controller is a magnetic encoder made from a rubbish HDD and cheap buttons.
Some photos are in the 'my images' section. (together with my previous Seicento modifications