The rear wiper gets power through 10a fuse 21 in the smart junction box which you indicate is ok so that leaves the rear wiper relay or wiper washer switch as suspect.
Ford f150 sliding rear window fuse.
Power rear windows power sliding back window.
Electric fan 1 relay.
F401 30 cb power sliding window switch rear roof opening panel module master window adjust switch window adjust switch passenger side 2006 ford f150 fuse diagram auxilliary relay box 2006 ford f150 aux relay box relay diagram.
The fuse panel is located under the right hand side of the instrument panel.
Passenger compartment fuse panel diagram.
The front wipers get power through 20a fuse 25 in the smart junction box which you indicate is ok so that leaves the wiper washer switch as suspect.
Trailer tow parking lamp relay.
Passenger compartment fuse panel diagram.
Power distribution box diagram.
Powertrain control module pcm relay 3 7l 5 0l and 6 2l engines 2.
The 2015 ford f 150 has 2 different fuse boxes.
Ford f150 fuse diagram for battery junction box and smart junction box.
To remove the fuse box cover place a finger behind the pull tab and your thumb above the pull tab as shown in the illustration then pull the cover off.
32 40 rear window defrost relay 33 not used 34 40 pcm power relay 35 not used 36 30 anti lock brake system abs module 41 15 heated mirror relay 42 not used 43 20 reversing lamp relay.
Power sliding back window relay.