Below is a photo of a Phaeton showing what it looks like after the fuse blows on the passenger side wiper. The wiper stops dead wherever it may be when the fuse blows, and typically, this will interfere with the operation of the remaining (functional) wiper. This is Chris’s car.
What it looks like when the fuse blows
I suppose if you just happened to have a spare fuse handy, you could wait a few moments for the wiper motor to cool down, then put the spare fuse in, and you might get a few more wipes before the spare fuse blows. For all practical purposes, though, once the fuse blows, you are toast... the corrosion has caused the mechanical load on the motor to reach a point where the current required to operate the wiper is excessive, and the only solution is to replace the wiper mechanism. It is not uncommon for both of the blades to be damaged as a result of the fouling of the remaining functional wiper blade against the failed wiper blade, thus, you will probably need to replace both blades as well.
Below is an illustration that shows the left and right side wiper blade mechanisms. Normally, these parts are not visible, they are covered up by the cover that goes over the air intake plenum, aft of the engine. These assemblies consist of the motor, the casting and linkages, and a few nuts and bolts. The motor itself is usually unaffected by the failure (the fuse protected it), thus the part you need to replace is the casting and linkage.
Left and right side wiper drive mechanisms
The photo below shows the left hand (driver side in NAR) assembly in situ before removal. It is not particularly difficult or time-consuming to remove this assembly, however, like all other Phaeton repairs, you need to pay attention to what you are doing because the car is rather complex, and you run the risk of screwing up something else totally unrelated to the system you are working on if you don't put everything back together properly.
The photos below show where the corrosion takes place. This is the passenger side ass