Rear wiper engine
The 'ticking' but not moving rear wiper in my case (Bravo 1.6 Nov-1996) was caused by a malfunctioning rear wiper electrical motor. Fiat just fitted a motor that is to weak to push the wiper around! Mine was replaced by a stronger one, and since then it wipes like h.ll!
By the way: make sure there is reason to wipe, because on a dry window the wiperrubber is just torn off the blade. Like the side window electric motors, Fiat fitted very cheap appliances.
Do something about this Fiat!
Regards,
Erik