washer doesn't work.
Hyundais have a plastic reservoir that can be cut through by flying debris. OR it could be the pump. OR you could check to see if the hose has become disconnected.
You need to disconnect the cable from the transaxel. Then you pull out your dash cluster. Remove clip from speedometer cable then just pull it out. Reverse for installation.
Goto http://www.hmaservice.com this is Hyundia's repair website. You'll have to sign up... it's free
and Search for "Back-Up Lamps Schematic" or "Electrical Troubleshooting Manuals - Back Up...