The invention relates to an adjustment system (1) and to a method for determining the set position (8) of a motor-driven adjustment part (6) of a motor vehicle by means of a Hall sensor (9), which is arranged in a rotated magnetic field, wherein the drive (4) of the adjustment part (6) is activated for a specified number of approaches of the adjustment part (6) toward an end position (8', 8), wherein a counter (15) is changed by a counting value upon each approach of the adjustment part (6) toward the end position (8', 8), wherein a standardization drive to the end position (8', 8) is carried out when the specified number of approaches is reached, and wherein each deactivation and/or activation of the Hall sensor (9) is detected and the counter state of the counter (15) is changed according to the number of deactivation and activation cycles.