My 2001 Honda Civic gx passenger rear window will roll down not up only when using the rear switch not the master. I took apart both the drivers door and passenger door and tested it with the tester I got from autozone. It lights up the tester when I push down and up on both of the doors and I've even changed the motor/regulator. I'm not mechanically inclined at all what so ever so any insight or ideas are greatly appreciated

 

Check the driver's door wire harness for a broken wire. The harness in behind the rubber conduit between the 2 door hinges at the driver's front door. I have repaired 2 wires for non-functioning rear windows. The driver's door gets the most open/closing cycles that it eventually breaks the wires.