Mercedes-Benz Windshield Wiper Problems: Motor, Linkage, Switch, Rain Sensor and Fuse Troubleshooting

Last updated: October 23, 2026

In this article, we will discuss common Mercedes-Benz windshield wiper problems. Did your Mercedes wipers stop working? If your wipers move, but you are having difficulties with the windshield washer fluid not spraying, you should read this article on Windshield Washer Fluid problems.

This article is broken into two main parts:

• Common Mercedes-Benz Windshield Wiper Problems
• Troubleshooting Mercedes Windshield wipers that stopped working

The goal of this article is to address Mercedes-Benz-related windshield wiper problems that you may face. The problems covered below are:

• The motor runs but the wiper arms do not move.
• The wiper switch has stopped working, often alongside the horn and turn signals.
• The wipers run and will not stop.
• The wipers move slowly or hesitate.
• The wipers behave erratically, speeding up or slowing down on their own.

Mercedes Wiper Problems

Go to top

I- Windshield wiper motor runs, but the arms don’t move.

The gear teeth on the wiper motor shaft may wear out and cause the wipers to stop moving. Other possibilities that can cause these symptoms are:

• Windshield wiper arms or linkage are broken.
• The bolt that holds the wiper arms in place is loose.

Solution: 

Ensure the link between the wipers and the wiper motor is not broken. Next, try tightening the bolt that holds the wiper arm in place.

II- The turn Signal, Horn, and Wipers all have stopped working

There may be a problem with the controller area network or the front signal acquisition module (SAM). You must connect your Mercedes-Benz to a diagnostic scanner and read the fault codes. You would need a scanner to read all control units on your MB. A scanner that can read Front SAM Control Unit fault codes is the YOUCANIC full system scanner. You could also try disconnecting the battery and reconnecting it. In very few cases, this trick could solve your wiper problem.

III- Installed new wipers, and the wipers stopped working.

You changed the windshield wiper blades, and now the windshield wipers are not working. Make sure the hood is closed. This is a safety feature. It will not allow the wipers to operate if the hood is open.

IV- Wiper hesitates to move or moves very slowly

This is a common problem with the mono wipers  (single wiper arm) found on Mercedes-Benz E, C, and CLK class (W202, W210, W208). Typical symptoms are:

• Slow wiper movement as the arm travels across the windshield.
• The windshield wiper fuse blows.

Solution

You should lubricate the wiper mechanism at the center (bottom) of the windshield. Remove the cover from the wiper arm and use a lithium grease such as Liquid Wrench White Lithium Grease. Here is a helpful tutorial on lubricating the windshield wiper mechanism on a Mercedes-Benz.

V- Mercedes Windshield Wipers work erratically.

This problem is common and is typically caused by defective Light and Rain Sensors for Automatic Headlights and Windshield Wipers.  If this sensor is defective, the wipers may move too fast or too slow for no reason.

Solution

The solution to this problem would be to replace the rain sensor. This will fix the problem when the wiper operation is so erratic that you can hardly use it. The rain sensor is located behind the rearview mirror. It has a plastic cover that will pop out. Usually, there are no screws for the cover; it simply snaps on top of the sensor.

It is also possible that your wipers may need to be calibrated with a factory level diagnostic tool.

Temporary Fix

You could temporarily unplug the electrical wire from the rain sensor, leading to your wipers working at a constant speed when turned on. This means that the automatic wiper function will not work. Therefore, if you set the wipers in one setting, they will stay at a constant speed. It will work like the old-school wipers used to. This may disable other features in your car. For example, your lights will no longer turn on automatically when you enter a tunnel.

Guide: Mercedes Windshield Wipers stopped working

Go to top

Did your Mercedes windshield wiper blades stop moving? If the windshield wiper blades on your Mercedes-Benz have stopped working, follow these steps to troubleshoot this problem.

Step 1: Check the windshield wiper fuse. This is an easy procedure, and you should be able to perform this task at home. Your Mercedes-Benz has three to four fuse boxes, depending on the model. They are on the side of the dashboard, engine bay, rear seat, or trunk. Find your car’s fuse chart and the corresponding fuse for the windshield wiper motor. Make sure the fuse is not burned out.

Once you remove the fuse,  a good one should look like the one in the picture above. If the fuse has burned out, replace it with a new one with the same ampere rating. Fuses are inexpensive, and it may be wise to purchase a box of 100+ assorted fuses, which you can find on Amazon.

It is common for the fuse to burn out if you press the window switch to activate the wipers, but the wipers have frozen, or there is snow on the windshield. Replacing the fuse may be all you need to do to fix the wiper problem on your Mercedes-Benz.

Step 2: If the fuse is ok, you should next check the power to the windshield wiper motor. You will need to use a digital multimeter such as the Mastech Series Digital AC/DC Auto/Manual Range Digital Multimeter. Set your multimeter to measure DC Voltage. Unplug the power cable from the windshield wiper motor and check for power. Ensure you are pressing the windshield wiper switch to activate the wipers, or you will never get any reading. 

Step 3: If the power goes to the windshield wiper motor, you should get a reading between 11 and 14 volts.

Did you get an acceptable reading? Yes  or No

Then the motor is getting what it needs and is not doing its job. Before you order one, settle one more question, because this page describes two different faults that both look like dead wipers.

You will need to replace the windshield wiper motor. Replacement motors are widely available; see Mercedes-Benz windshield wiper motors on Amazon. A new aftermarket replacement motor for Mercedes-Benz cars can cost as little as $35.

Replacing the wiper motor is a straightforward procedure.

Continue to the next step.

Step 4:
If you are not getting power to the plug that goes into the windshield wiper motor, you need further troubleshooting.

The next item to inspect would be the windshield wiper switch, also known as the combination switch. The combination switch is located in the steering column. To replace it, you will need to remove the driver airbag and the steering wheel.

Step 5:  List of possible wiper malfunction causes.

• There is a defective windshield wiper relay. Below, you can see the location of a relay in the fuse box. You will need your Mercedes-Benz class’s fuse and relay chart to find the exact location.
• The wiring harness is defective. It could have been damaged during an accident.
• The controller area network is damaged, or the front signal acquisition module is bad.
• A broken linkage between the wiper arm and the wiper motor.

Does a wiper fault need a diagnostic scanner?

Mostly no, and the article above is the reason why. A blown fuse, a stripped coupling, a seized linkage or a dead motor are all found with a multimeter, a hand on the motor housing and a fuse chart. None of that needs a scan tool, and it is worth saying so on a page that sells you a box of fuses.

There are two faults here where a scanner is the shortcut rather than a luxury, and both are named above.

• The wipers, horn and turn signals all died together. That combination is not three faults, it is one: the front SAM or the network it sits on. Rather than pulling a steering column apart on a guess, read the module and see what it reports.
• The wipers behave erratically. The rain and light sensor is the usual cause, and the sensor reports its own status. Reading it tells you whether it is actually faulty before you buy one and pull the mirror cover off.

The YOUCANIC UCAN-II Pro reads the front SAM and the body modules rather than only the engine, which is the part a basic OBD-II reader cannot do. On the combination switch job it is worth more than the tool cost in avoided work, because the airbag has to come out to reach that switch and you do not want to do that twice.

When the SAM is the fault

If the scan puts the fault in the front signal acquisition module rather than the switch, the motor or the fuse, the repair route is worth knowing before a quote arrives. A replacement SAM has to be coded to the car. A board level repair of the original does not, so the coding stays as it is. Module Medics repair these units at board level and return the original, and our SAM module guide covers the symptoms in more detail.

The honest caveat, and it matters here more than most: water is the usual reason a SAM fails. Find out where it got in and fix that first, or the repaired unit meets the same water and fails again.

Related reading