Ive got a doozy here my pass rear window wont go down, ive replaced the master switch replaced the pass rear switch replaced the motor/ regulator unit, still will only go up not down, if you cross over the wires to the motor/ reg it'll go down with no issues just not up then! not sure what my next area to look at is Any ideas?
truck has zero rust no wire corrosion anywhere, window just stopped working randomly one fine day!

 

mine are like that a carbon build up from the spark when being apply.
i take the switch open it clean all contact with a file and i good for a while.
but you did replace them. did you try switching them from another door if the problem stays to that window or is being carried to other door