1999 disco 2. Front right side window was working fine until I had to pull the panel to work on something else and when I put the window down It would not go back up. noticed there seemed to be no power to get it to move up only down. So I pull the regulator and motor 🙃 Regulator is good condition, motor works but only down. I tried swapping the switches at the console but still the same problem. I can hear clicking behind the dash when I push the switch for down but again when I press for up not even a click. Faulty BCU? Wiring problem? Any help is appreciated as both front windows are out rn and it’s winter in the pnw 🥶

 

With the upholstery removed, disconnect the motor plug. Apply 12 V from the battery poles to the motor side connector alone with any wires you gather. Then do the same reversed. If motor runs in both polarities, motor is good and hunt the problem to wiring / switch.

 

Missed "Window" and read as "motor only runs one direction" and I was like, "well, yeah, that's how it's supposed to work"🤣

On a more useful note, there is a circular metal cover on the side of the window motor. Pop that cover off and make sure the cog inside has not stripped. Happened to one of mine years ago. Grabbed well enough to go down, wouldn't grab to go back up.