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If the pump is the same as the Laguna (which I think it may be) then the pump rotation is reversed between front / rear windows. The front and rear pipes are separate so if one was blocked it should not affect the other.
The connection to the pump is by two wires and the polarity is swapped by the steering column switch.
Do both front and rear work or is it only the one?
It sounds as if it is an electrical problem with either a relay or the switch.
Currently in Gasjunkie's garage:
Renault Laguna Executive 3.0l 24V V6 Auto