electric window problem

I have got a 1990 ciera, all the electric windows work, except the passenger side. I checked the master control and there is power going out of it, but it is not reaching the other side. I have looked for broken wires in between the doors and can't seem to find any broken wires. and the motor is good. I am lost as to what it could be. Anybody got any ideas, that I can run with. thanks