Patent ID: 7817383

Claim:
A windshield wiper, comprising: a direct current electric motor for driving a windshield wiper mechanism, the motor including a rotor, a first, a second, and a third carbon brush brushing on its rotor, the first carbon brush being grounded, the second carbon brush being connected selectively to a direct current source by a contactor, the third carbon brush being connected selectively to the direct current source; a first subassembly that detects sticking of the electric motor to deliver an item of information on the sticking of the motor; means for delivering a command signal to a contactor that interrupts connection of the motor with the direct current source; means for measuring a voltage between the first and the third carbon brushes to obtain a first measured voltage value; and a comparator that compares the first measured voltage with a first threshold value to generate a second item of information on the sticking of the electric motor if the comparison has determined that the first measured voltage is less than the first threshold value.