09 Tribute, both wipers work but no washer on front or back. The pump is bi directional and is fused thru the front windshield wiper fuse. If the wipers work but the pump doesn't, ether the pump is bad or the connection on the pump is corroded. Loosen the inner fender well panel, disconnect the pump and check for power in the connector when the washer button pi pressed. If you have power, clean the connections and reconnect. Does it work? If not, replace the pump.
Thanks to my Son in Law, Mike....