Sorry for the delay in getting back with some more help. Have been very busy!
Here goes then. First, remove the steering wheel cowlings, just the upper may suffice. Locate the wiper switch connection plug. There will be 2 rows of wires in this plug. These are labelled A 1 to 7 and B 1 to 7. The letters and numbers are very small and difficult to read (for someone of my age and eyesight!)
The two wires that control the TRIP COMPUTER run through are located in B row, wire 5 (BLACK) and wire 7 (VIOLET) This is only an earth pulse so its quite safe to bridge these 2 wires, making sure you have the right wires in the first place!
With the ignition turned on bridge the two wires, briefly, with a small split pin or similar and see if the trip computer changes display on the dash. If it does, then you have a faulty switch, if not then there is obviously another fault which is beyond diagnosis in a forum! You will have to take it to a Renault dealer.
Hope that helps, let me know who you get on with it.
Regards, Bob RTE