read this thread http://www.bimmerboard.com/forums/posts/1247075/
Author: htrdbmr Posted on: 2015-01-22 by htrdbmr Yes, I powered the motor from the brown plug. The plug has 2 pins for the motor, and 3 for the potentiometer. By reversing the + and - on the motor pins, you change the direction of travel. workshop manual section 52-10/1 : a power seat can be adjusted manually in forward / backward direction with a screw driver with 4mm blade in case of power control failure. Insert screwdriver in hole of potentiometer or motor and turn until the bolts are accessible