[LMP]

ponchonutty is right. THis unit is fragile..does not endure abuse...and wiper blades getting stuck in ice is abuse. I suggest you live with it during this winter. Turning the wiper OFF before leaving car is a mandatory checklist item when equipped with remote start. Sorry it turned out that way...but as poncho said...this is almost a question of "when"...rather than "if"....
you can check at rockauto.com for an idea of price...and this is an item that should be procured as new...unless you find one on a recent "totalled".

EDit: as suggsted in following posts, ground is indeed a problem with these units..had to "reground" the unit on my son's z-34 a few weeks ago..but that was a '92...yours is rather new so I do not think it is a ground probleem...and my son's had internal damage too and refuses to park regularly.