Was able to move the seat by hooking up 12v leads to the motors first through the power leads on the motor connection to raise the seat, and then through the leads connected to the computer. There are 5 wires hooked to each motor lead. The 3 smaller gauge wires are potentiometer or something like that, and the thicker 2 are the power. As the motors are reversible, a current one way through the power wires will move the motor one way, and reversing the current will move it the other way. If one has to move the seat through the motors, the set where only 2 wires connect to the motor are the ones to use.
The motor the moves the seat from forwards and backwards was in the center of the set of 3 motors. I opted to use the leads to move the seat there... I couldn't get my hand in to get the leads to move the seat upwards, so I used a long set of solid steel 'lances' to adjust from the motor...

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'95 S320 LWB
'87 300SDL
'04 E500 wagon 4matic