If the tailgate wiper works but the rear washer does not spray, inspect the tailgate washer pump and hoses. Remove the tailgate inner panel and confirm the pump runs. If it does not, check pin A for a good ground and pin B for 12 volts with the washer switch selected; replace the pump if power and ground are present. If the pump runs, inspect the hoses from the reservoir to the pump and from the pump to the nozzle for breaks or clogs.
The owner of a 1995 Chevy Blazer with 160,000 miles reports that the rear washer will not spray despite fluid in the tank, while the front washer works. The expert says a working tailgate wiper with no spray points to a failed tailgate washer pump or a broken or clogged washer hose. They recommend accessing the pump through the tailgate inner panel, verifying ground and 12-volt power at the connector, replacing the pump if it has power but does not run, and checking the hoses if it does run.
