I had the problem which allows the power seats to be moved only with the door open and the ignition ON or OFF. The seat would only move when the door is closed with the ignition ON.See the PDF above for the repair.CLICK
If replacing the part; The part number to be replaced is;MB #002 542 22 19 or Siemens Part #72KD305 it is probably cheaper to buy using this part number, or Chrysler #05104857AA? do not use the Chrysler number, too expensive.