2020 Mercedes-Benz SL450 Windshield Wipers Aren't Working

Fix Windshield Wiper Issues on 2020 Mercedes-Benz SL450

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Reviewed by
Devin Cabugcal
Written by RepairPal Car Genius
Updated January 14, 2025
0%
75% chance it's the
Wiper Motor
0%
25% chance it's the
Switch
The most common reasons a 2020 Mercedes-Benz SL450 windshield wipers aren't working are broken wiper motor and issues with the switch.
  • Wiper Motor: A faulty wiper motor or a bad electrical connection can result in intermittent or non-functioning windshield wipers.
  • Switch: A faulty switch can result in intermittent or complete failure of the electrical component it controls, leading to malfunctioning systems.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a 2020 Mercedes-Benz SL450 windshield wipers aren't working?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

A failed windshield wiper motor will do one of two things in the event of failure. First, it can intermittently work, meaning when the wiper switch is turned on, the windshield wipers may activate, and run for a random amount of time. This may happen at random, or change with a bump. Lastly, the windshield wipers could show no signs of activity, indicating motor failure.

The moment water touches the windshield, you know if you need new windshield wiper blades. If your wiper blades are torn, cracked, hard, or brittle, it is time for replacement. Wipers should also be replaced if the wiper blades only smear water around, seem to make a mess, streak the windshield, and miss large patches. If you are unhappy with the current wiper blades on your vehicle, this is a very economical change to make.

Windshield wiper arms will be replaced mainly for aesthetic reasons or damage. If the windshield arms become bent or rusted, the windshield wipers may not contact the windshield at the proper angle, or there may be no contact at all. Also, the sun will take a toll on these parts after years of use, and fading or clear coat peeling will result, not to mention rust.

What are the steps to diagnose the non-functioning windshield wipers on a 2020 Mercedes-Benz SL450?

To effectively diagnose non-functioning windshield wipers on your 2020 Mercedes-Benz SL450, begin with the simplest solution by checking the fuse associated with the wipers. A blown fuse is a common issue that can easily be resolved. If the fuse is intact, proceed to inspect the wiper motor, as a malfunctioning motor can hinder the wipers' operation. Next, examine the wiper linkage for any signs of wear or damage, as this component is crucial for the wipers' movement. If these components are functioning correctly, test the wiper switch to ensure it is operational, as a faulty switch can prevent the wipers from activating. Finally, inspect the wiring for any damage or loose connections, as electrical issues can disrupt the wipers' functionality. By following this diagnostic approach, you can systematically identify and address the root cause of your windshield wiper issues, ensuring a thorough and effective troubleshooting process.

What are the common causes for the windshield wipers not working on a 2020 Mercedes-Benz SL450?

When dealing with non-functioning windshield wipers on a 2020 Mercedes-Benz SL450, it's crucial to understand the common problems that could be at play. One of the first things to check is the fuse; a blown fuse can easily disrupt the wiper's operation, and replacing it is a straightforward fix. If the fuse is intact, the next step is to inspect the wiper motor itself, as a malfunctioning motor may require repair or replacement. Additionally, worn wiper blades can significantly affect performance, so replacing them can enhance visibility during inclement weather. It's also important to examine the wiper linkage, which connects the motor to the wiper arms; any damage here can prevent the wipers from functioning properly. Lastly, consider potential electrical issues, such as faulty wiring or a defective switch, which can complicate the wiper system's operation. By systematically checking these components, DIYers can effectively diagnose and address the issues affecting their windshield wipers.

How urgent is it to repair the non-functioning windshield wipers on a 2020 Mercedes-Benz SL450?

When it comes to the urgency of repairing non-functioning windshield wipers on a 2020 Mercedes-Benz SL450, the implications are significant. First and foremost, safety is paramount; without functioning wipers, visibility during rain or snow is severely compromised, increasing the likelihood of accidents. Additionally, many jurisdictions have laws requiring operational windshield wipers, and driving without them could result in fines or legal repercussions. Beyond immediate safety and legal concerns, neglecting this issue can lead to further damage to the wiper system or even the windshield itself, which could escalate repair costs. Lastly, having reliable wipers enhances the overall driving experience, providing comfort and peace of mind. Therefore, addressing the malfunction promptly is essential to ensure safe and compliant driving conditions.

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2020 Mercedes-Benz SL450 Windshield Wiper Problems Explained