Hi Dan,
The shades are part of the multiplexing system. DONOT short the wires together. Each switch has an "address" so when it calls the controller, the controller knows who is calling and then it will execute the command. Have someone look at the controller when you push the switch to find the LED that lights up. Check the fuse at that location. If you have MCD shades it could me the step motor inside the shade. Not uncommon for them to fail after 3-4 years. If you can locate the the red and black 22 guage wires going to that shade, disconnect them from the system and then power them up to a 12volt source. Reverse polarity to change direction of the shade. Hope this helps, Fred