If you can post a picture of the schematic maybe someone can give you some ideas. Generally there are 2 wires for each motor in the seat. They are color coded. You hook up + and - and the motor goes one way or the other. Reverse the wires and it goes the other way. These days with CAN it can get more complicated but in the old days that was it. The switches can be complicated but the wires to the seat SHOULD be straight forward. However I have never seen the schematic.

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra