My connection sucks today I can not upload any images, I checked the manual however of my 2004 FX45 - it should be very similar to yours - and there are 4 fuses/fusible links related to the rear wiper that need to be checked. Two of which have been mentioned by la_fx35 above.
You will find what are these in a table in section WW on page # WW-40, you find their locations in the same section on page # WW-35.
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