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 in 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. Here is a list of possible issues:
- Mercedes Wipers Not Working
- Windshield Wiper Switch Stopped Working
- Mercedes Windshield Wiper Stays Running / Won’t Stop
- Mercedes Benz windshield wipers not working
- Mercedes windshield wiper problem
- Mercedes E, S, C Class Wipers quit moving
- Mercedes Wipers stuck on top
I- Windshield wiper motor runs, but the arms don’t move.
The gear teeth on the shaft of the wiper motor may wear out and cause the wipers to stop moving. Other possibilities that can cause these symptoms are:
- Windshield wiper arms or linkage broken.
- The bolt that holds the wiper arms in place is loose.
Make sure that 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- Turn Signal, Horn, Wipers all have stopped working
It is possible that there is a problem with the controller area network or the front signal acquisition module (SAM). You will need to get your Mercedes-Benz connected to a diagnostic scanner and read the fault codes. You would need a scanner that is capable of reading all control units on your MB. Besides the Star Diagnostic scanner a couple of alternative scanners able to read Front SAM Control Unit fault codes are the iCarsoft MB II and Autel DS708. You could also try disconnecting the battery and reconnect 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. Now the windshield wiper will no longer work. 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 move 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:
-a slow wiper movement as the wiper moves on the windshield.
-windshield wiper fuse blows
You should lubricate the wiper mechanism at the center (bottom) of the windscreen. 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 how to lubricate 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 Sensor for Automatic Headlights and Windshield Wipers. If this sensor is defective, the wipers may move too fast or slow for no reason.
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 them. 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 using Star Diagnostic Scanner.
You could temporarily unplug the electrical wire from the rain sensor. Your wipers will work on a constant speed when turned on. 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 too. This may disable other features in your car. For example, your lights will no longer turn on automatically when you enter a tunnel.
Did your Mercedes windshield wipers blades stop moving? If the windshield wiper blades on your Mercedes-Benz have stopped working altogether, 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. They are located on the side of the dashboard, engine bay, rear seat or even in the trunk. Find the fuse chart for your car and locate 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 active the wipers, but the wipers have frozen, or there is snow on the windshield. Replacing the fuse may be all that you need to do to fix the wiper problem on your Mercedes-Benz.
Step 2: If the fuse is ok, the next thing you should 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. Make sure you are pressing the windshield wiper switch to activate the wipers, or you will never get any reading.
Step 3: If power is going 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 you most likely have a faulty windshield wiper motor. Power is going to the motor, but the windshield wiper motor is failing to operate. You will need to replace the windshield wiper motor. Replacement motor can be found even online, see these eBay listing on Mercedes-Benz windshield wiper motor. A new aftermarket replacement motor for Mercedes-Benz cars can cost as little as $35.
Replacing the wiper motor is a stright forward procedure.
Continue to the next step.
If you are not getting power to the plug that goes into the windshield wiper motor, then you need to do some further troubleshooting.
The next item to inspect would be the windshield wiper switch or what is also called the combination switch. The combination switch is located in the steering column. To replace it you will need to remove the airbag and steering wheel.
Step 5: List of possible wiper malfunction causes.
- Defective windshield wiper relay. Below you can see the location of a relay in the fuse box. You will need the fuse and relay chart for your Mercedes-Benz class to find the exact location.
- Wiring harness is defective. It could have been damaged during an accident.
- Controller area network is damaged or the front signal acquisition module is bad.
- A Broken linkage between the wiper arm and the wiper motor.