PURPOSE:To reduce the number of switches thus to facilitate the operation of power window system where the opening/closing of window is controlled through a receiver in accordance to the operation of dismountable transmitter, by constructing such that the open/close control signals for the front/rear door window glasses are switched with correspondence to the mounting/dismounting of transmitter. CONSTITUTION:When a transmitter T is mounted on a receiver R, a magnet provided on the transmitter T will turn on the reed switch 14 in the receiver R thus to turn off the transistor Tr11 and to disable the relay 10 to bring the contacts 10a-10d into such connecting position as shown on the drawing. Upon operation of switches 3a-3d for opening/closing the left/right window glasses of transmitter T under this state, drive motor 35 or 36 for opening/closing the front/rear left/right door window glasses is controlled to rotate forward/rearward. Upon removal of the transmitter T, from the receiver R, said relay 10 will function to switch the contacts 10a-10d to the opposite side. Under this state, drive motor 37 or 38 for opening/closing the rear left/right door window glasses is controlled to rotate forward/rearward through operation of the transmitter T.
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