As far as I can tell, this board seems to reverse polarity where pin 6 on the black connector is the common "ground" (for lack of a better word) or M– for the motors, and pins 2-5 is M+ for each motor (Fwd/Rev, Back, Up/Down, Length). Pin 1 is 12V and Pin 7 is GND.
Right, I'm going to quote myself ...

Finally, you ONLY need to jump the normally open relay which is how the car prevents the seat from moving when the ignition is off. Here's where to place the jumper. I saw another post soldering a daisy chain between the motor pins, you don't have to do any of that.


Hi there, been perusing this ...