Try not to spread the same problem over multiple threads.
It makes it difficult to follow both for your problem and future reference by people with similar problems.
In your other thread, I mentioned that Rave was your friend with circuitry. From Rave...
Looking at this, it appears that the dual Up/Down relay when 'not in use' provide a path from the Earth K108 to pins C612-6 and C612-3 respectively.
When the Up or Down button is pressed the relay then switches from the Earth to the power feed coming in to the Relay on C043-2.
So when the Window Up switch is pressed, the motor will be getting an earth on C612-3 and 12V on C612-6.
This is taken from page 5.2 of the Circuit Diagrams in Rave for a 98 model car.
C612 is the connector on the motor. From Rave....
I have not tried this. I don't know if any of the other pins need setting for the motor to function. It will probably be described in the Rave section describing how the window mech works.