On my friends 03 350Z, I push the wiper level forward (or backwards) to initiate the spray nozzles to clean the windshield, I noticed it works the opposite way that it should. When the front windshield nozzles spray water on the windshield, the rear windshield wiper moves and visa versa.

Any tips or suggestions to pointing me in the right direction to help him out?

 

pull for front window push for back