My rear window washer won't spray washer on the window. I have had it repaired twice, but it almost immediatly stops working again. This has been a problem since my original purchase of the new auto in 1999.
Rear Window Washer on 1999 Toyota RAV4
I'd guess there's dirt in it clogging the pump or nozzle. You may need to take it apart and clean the tank and lines. Possibly disconnecting the line from the nozzle and running it for a while may get enough dirt out to be OK. There also could be a screen in the tank that needs to be cleaned. Good Luck with it.