Windshield wipers are a vehicle system needed in order to remove moisture and dirt from car windows. By their structure the windshield wipers system is one of the active safety systems, because it provides visibility to the driver in all conditions, and thereby prevents accidents. Windshield wipers are usually located on the windshield and rear window. On some vehicles, there are additional headlights washers. In order to increase the efficiency of the wiper, a washer is additionally used.

Wiper motors and control systems must be able of regulating the rotation speed of the shaft when the load, weather and road conditions change. Rotational speed of the motor shaft with electromagnetic excitation is regulated by changing the current in the parallel field winding. In an electric motor with excitation from permanent magnet, the change of frequency of shaft rotation is achieved by installing an additional third brush, offset from the geometric neutrals, and with intermittent operating mode.

The area and location of clearing zones on the glass depend on the relative position of the actuator bearings of the wiper and the values of radii. Brushes with length 260-1000 mm are used to clean the windshield and rear window. In order to reduce the wear out degree of brushes during operation, the elimination of gaps in supports and hinged gear is required.

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What you need to know about windscreen wiper motor replacement: service life, common defects and their signs, tips and recommendations

Manufacturers don’t specify certain lifetime limit for the windscreen wiper motor. The component is replaced in case of winding breakage or short circuit, thermal damage of contacts and wear-out of windscreen wiper blades, limit switch damage. At broken down motor, wiper blades do not work or work non-synchronously, stop in random position.

Windscreen wiper electric motor diagnostics should be performed at a service station because it is to be demounted and inspected for check. Worn-out blades, signs of thermal and mechanical damages will point at necessity to replace the component. In order to check serviceability of the unit you need to measure fuse voltage with the help of a multimeter. Received results are compared with maximum values specified by the manufacturer.

Replacement of the windscreen wiper motor should be also performed at a service station because features of the procedure can differ according to a vehicle model. As a rule, you need to demount blades arms, disconnect electromotor wires harness, remove the wiper linkage and then remove the motor. After that you need to install a new component and perform assembling in the reverse order.