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Hi - came across this thread while looking for a different fault - however, may be able to offer a solution here.
had the same problem a couple of years ago with my wife's Megane - which have still got & driving me mad at the moment.
Anyway - seemed like a possible earthing problem to me, so bought an earth strap for a battery (flat terminal ends), and connected betweeh the mounting plate for the wiper motor (using one of the 3 10mm bolts that holds the motor on) and to a good earth (a bolt on the bulkhead).
Problem solved - it seems that becuase the earth for the wiper motor had gone, it was managing to use the wiring through the heater fan to find an earth.
Hope this helps