One windscreen wiper stopped working on my mx-5. It's not moving at all.
The wiper arm could have come loose from the driving shaft. Lift it off the screen and see if it mooves backwards and forwards freely. Lift the cover at the bottom of the wiper arm and see if the nut is loose. If it is tighten it and hope that the splines aren't worn off the wiper arm and the shaft. If the wiper arm and the shaft are well attached, one of the linkage points might have come loose or one of the shafts might have broken. It will be obvious. Before you start stripping plastic covers to get to the motor, run the wipers with the arms off the windscreen and listen out for odd noises.
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