Patent ID: 8005590

Claim:
A wiper control method comprising: driving a motor to rotate forwardly and reversely so as to reciprocate a wiper arm for a wiping operation; and controlling operation of the wiper arm according to an absolute position signal output when the wiper arm is located at a predetermined position and a relative position signal output in association with the rotation of the motor, said controlling including: moving the wiper arm in a predefined first direction at a start-up time of the wiper arm; when the motor is in a locked state before the absolute position signal is output, executing a reciprocation operation in which the wiper arm is moved once in a second direction opposite to the first direction, and then the wiper arm is moved once in the first direction; and when the absolute position signal has not yet been output even after the execution of the reciprocation operation, the reciprocation operation is executed once again.