Introduction

If you've noticed that only one of your windshield wipers is not moving, you're likely encountering an issue that can be caused by several factors. This article will guide you through the most common reasons, helping you identify the problem and find a solution.

Common Causes of a Non-Functioning Wiper

Windshield wipers are an essential component of your vehicle, ensuring clear visibility during wet or dusty conditions. When one wiper is not moving, several potential causes could be at play. Understanding these causes can help you diagnose the issue more effectively.

Wiper Motor Failure

The wiper motor is the primary component responsible for moving the wiper arms. Its failure can cause a wiper to cease moving. This is often due to a malfunction in the motor itself, especially if the motor is dedicated to only one wiper.

Linkage Issues

The mechanical linkage connecting the motor to the wiper arm can also be the culprit. If this linkage is broken or disconnected, one wiper may not move while the other continues to function. This issue can often be identified by visual inspection or by attempting to reconnect the parts.

Wiper Arm Problems

The wiper arm itself can develop issues such as looseness or damage. If the arm is not securely attached to the motor or linkage, it may not move even if the motor is functioning correctly. This can be a simple fix if the arm is only loosely attached, but more complex if the arm itself is damaged beyond repair.

Electrical Issues

Electrical problems can also cause a wiper to stop moving. These issues may include problems with the wiring or connectors leading to the wiper motor. Excessive corrosion, loose connections, or broken wires can disrupt the power supply to the motor, preventing it from operating.

Blown Fuse

A blown fuse in the wiper system can interrupt the power supply to one of the wipers, especially if the circuit is not designed to handle simultaneous power usage for multiple wipers.

Obstructions

Debris or ice collecting on the wiper arm or in the wiper mechanism can obstruct its movement, causing it to stop working. Clearing these obstructions can often resolve the issue, but more thorough cleaning may be required.

Control Switch Malfunction

The switch used to operate the wipers might be faulty, preventing the signal from reaching the motor for one of the wipers. This issue can be identified through a visual inspection of the control panel and electrical connections.

Motor Gear Issues

Internal gears within the wiper motor can become damaged or stripped, affecting the movement of one wiper arm. These issues typically require professional repair or replacement of the motor.

Transmission Linkage Pivot Failure

Another potential cause is a broken transmission linkage pivot. The wiper arms are connected to a splined shaft that is pressed into a flat bar. In some cases, the pivot point where the splined shaft is attached to the flat bar can strip, leading to a malfunction. Depending on the severity, the entire assembly might need to be replaced.

Conclusion

The key to resolving a non-functioning windshield wiper is to methodically check each component. By understanding the common causes, you can narrow down the issue and take appropriate action to restore clear visibility on your windshield.