Abstract: Automatic opening/closing control of side windows of a vehicle. An electronic control device mainly composed of a microcomputer reads respective time-serial opening/closing patterns of key switches. These time-serial opening/closing patterns are respectively allocated to commands sent to the electronic control device. The electronic control device controls driving of the opening/closing mechanism for each side window in accordance with the commands. The electronic control device further effects overload detection of the opening/closing mechanism, limit position detection in movement thereof as well as arithmetic operation of the actual position, and then stops driving of the opening/closing mechanism at the time when the opening/closing mechanism undergoes overload and at the time when the actual position reaches the goal position.