Do you hear  pump come on? If you do you might have clogged ports on
the hood. You can clean them.
If you don't hear anything, you might have some bad contacts in the
switch on the turn lever stalk. Try pushing it in a few times to clear
any corrosion it might have. There was a recall for the turn
lever/wiper switch being defective.
Also check the fuse. One more thing you can do to verify the pump is
good is to jump it out with 12v going to it directly.