If you have a circuit diagram of the wiring you should be able to trace it through with a meter until you find the point at which it has dissapeared if it will stay off long enough of course. If you are unable to do this yourself I would take it to a good auto electrician rather than the garage.
There may of course be be someone who knows the answer but if no one turns up here I would suggest you find a dedicated Renault forum.
|