Mercedes-Benz S500 Windshield Wipers Aren't Working

Common Causes for Non-Functional Windshield Wipers on Your Mercedes-Benz S500 and How to Fix Them

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Reviewed by
Aisha
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 Mercedes-Benz S500 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 Mercedes-Benz S500 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.

Troubleshooting Non-Functional Windshield Wipers in a Mercedes-Benz S500

When faced with non-functional windshield wipers in your Mercedes-Benz S500, it's essential to adopt a systematic diagnostic approach. Begin by checking the windshield wiper fuse, as this is often the simplest and most common issue. If the fuse is intact, proceed to inspect the wiper motor for any signs of electrical faults, which may require replacement if found defective. Pay attention to any unusual behavior, such as wipers operating without being activated, as this could indicate deeper electrical problems that might necessitate professional intervention. Additionally, assess the movement of the wiper blades; if they are stationary, the issue could stem from a blown fuse, a malfunctioning motor, or linkage problems. Conversely, if the blades are moving but not effectively clearing the windshield, consider the condition of the wiper blades themselves or the alignment of the wiper arms. To access the wiper arm assembly for further inspection, carefully unclip the plastic cover located near the center of the windshield area, which will allow you to reach the motor situated inboard of the firewall. By following this structured approach, you can effectively diagnose and address the issues with your windshield wipers, restoring their functionality with confidence.

What to Check When Windshield Wipers Aren't Working on a Mercedes-Benz S500?

When troubleshooting windshield wiper issues on a Mercedes-Benz S500, it's essential to consider several common problems that could be affecting their functionality. Start by examining the wiper motor, as it is often the primary culprit behind malfunctioning wipers. If the motor appears to be operational, the next step is to inspect the wiper switch, which can sometimes fail and disrupt the wiper's operation. Additionally, worn or damaged wiper blades can hinder performance, so replacing them is a straightforward and effective solution. Don't overlook the importance of checking the windshield wiper fuse; a blown fuse is an easy fix that can restore functionality. Water intrusion into the driver's front fuse box can also lead to wiper issues, so ensure that the cover is properly sealed. Lastly, consider the relays in the wiper system, as faulty relays can prevent the wipers from working altogether. By methodically assessing these components, you can effectively diagnose and resolve the issue with your windshield wipers.

Why Are the Windshield Wipers Not Working on a Mercedes-Benz S500?

When the windshield wipers on your Mercedes-Benz S500 fail to operate, it is crucial to address the issue promptly to avoid compromising your safety on the road. Neglecting malfunctioning wipers can lead to reduced visibility during rain or snow, significantly increasing the risk of accidents. Common culprits behind this problem include a faulty wiper motor, a malfunctioning switch, or blown fuses, all of which can be easily checked at home. Additionally, if the wipers are stuck due to old, brittle blades or if there are issues with the washer system, these problems can escalate if not resolved quickly. Ice or snow buildup can also hinder wiper performance, making it essential to clear your windshield before driving. By taking immediate action to diagnose and fix these issues, you not only enhance your driving safety but also prevent potential damage to your vehicle's wiper system, ensuring it remains in optimal working condition.

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