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I have a similar problem, Laguna II Sports Estate if I open the glass part of the hatch I can see the motor turning. The arm moves freely, on top of the motor is a round steel plate with a hole, should there be something on top of this, there is a spring loaded pin on the arm, but they don;t seem to talk to each other.
The rear wiprparks on the right as you look from the back of the car .The spring loaded pin slots into the hole on the disc and operates the wiper .
Unfortunately the shaft that passes through the glass seizes up and so it cannot move .So if you switch the rear wiper on it will apply stress to the rear glass and some of these have been known to shatter with the pressure so best to disconnect the motor wires till fixed.
Hope this helps
Currently in siaradbach's garage:
2003 LagunaII Initiale sports tourer 16v 2.0 and a Honda CX650E Freelander2 2.2 GS TD4 2008