PURPOSE: To drive a normal wiper motor synchronously continued by stopping a feed of power to a wiper motor, which is stopped by a trouble or the like, of a plurality of the wiper motors.

CONSTITUTION: A condition of each signal from cam switches SW1, SW2 corresponding to two independent wiper motors 10, 20 is detected by a microcomputer 31 of a wiper controller 30. When the above-mentioned cam switches SW1, SW2 are placed in a stop position, a power feed is started simultaneously to the above-mentioned wiper motors 10, 20. This power feed is continued by an equal drive cycle. The signal from the cam switches SW1, SW2 of reaching last the stop position is detected to repeat the power feed in the next cycle. The wiper motor, in which the signal from the above-mentioned cam switches SW1, SW2 is not changed even after a predetermined time preset in the above- mentioned equal drive cycle, is decided in trouble. A corresponding relay is reset to stop the power feed and also separating the signal from this cam switch from a control system.