Why Do Windshield Wipers Sometimes Stop Mid-Sweep?

Understanding the Issue

Have you ever encountered your windshield wipers stopping mid-swipe while driving? If the car was still moving and everything else was functioning normally, what might be the cause behind this peculiar behavior? This article aims to provide insights into understanding and troubleshooting such issues.

Ruling Out Motor Failure

One common reason for your windshield wipers stopping mid-swipe could be a failing windshield wiper motor. Similar to the scenario you described, a motor that is on the verge of failure might exhibit erratic behavior, such as stopping and then starting again. This is not uncommon, especially in environments with frequent rainfall. If the motor has issues, it may show signs of failing repeatedly before completely ceasing to function.

Electrical Issues and Circuit Breakers

Electrical malfunctions can also sometimes be the culprit. When a motor is unable to turn the wiper blades (due to various reasons), it can cause overheating. This is where the circuit breaker within the wiper motor can play a role, as it is designed to protect the motor from damage.

Pulse Mode Failure

Another possible cause is a pulse mode failure. In modern cars, windshield wiper motors are often associated with electronic actuators rather than traditional rotating cam systems. The pulse mode failure means the wipers are not functioning at their normal runtime but instead running intermittently. This can be a result of an electronic hiccup in the wiper control module, which is responsible for regulating the motor's speed and action. For instance, the 'intermittent' setting might be accidentally selected, causing the wipers to move at irregular intervals.

Preventive Measures and Solutions

To avoid unexpected wiper behavior, particularly during rainstorms, consider checking the following:

Ensure the wiper blades are in good condition and properly positioned on the windshield. Inspect the wiper motor for any signs of wear or damage. Check the wiper control module for any internal issues, such as a blown fuse or faulty circuit.

In cases where you suspect an electronic issue, a closer inspection is necessary. If you are comfortable with DIY repairs, you can start by using electronic contact cleaner and cleaning the contacts in the wiper control module. However, if you lack the necessary tools or time, consulting a professional mechanic is recommended.

Conclusion

While windshield wipers stopping mid-swipe can be frustrating, it is a symptom of a broader issue that needs to be addressed. By understanding the possible causes and conducting proper maintenance, you can ensure that your vehicle's wipers operate smoothly and effectively, especially during bad weather conditions.