2018 Mercedes-Benz GLC350e Window Won't Go Up Or Down

Resolve 2018 Mercedes-Benz GLC350e window issues effectively and restore functionality.

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Reviewed by
Andrew Hajjar
Written by RepairPal Car Genius
Updated January 14, 2025
0%
36% chance it's the
Fuse, Relay or Electrical System
0%
20% chance it's the
Window Motor
0%
24% chance it's the
Window Regulator
0%
20% chance it's
Something else
The most common reasons a 2018 Mercedes-Benz GLC350e window won't go up or down are window's electrical system such as a fuse or relay, a broken window motor, or a broken window regulator.
  • Fuse, Relay or Electrical System: A blown fuse or a faulty relay can disrupt the electrical circuit, causing components to fail or operate intermittently.
  • Window Motor: A faulty window motor or a broken window regulator can prevent the window from moving up or down properly.
  • Window Regulator: A faulty window regulator can cause the window to become stuck or operate erratically due to worn gears or a broken cable.
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 2018 Mercedes-Benz GLC350e window won't go up or down?

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.

If the door window motor fails, the window may not open or close, or it may operate intermittently. Traditionally, problems with power windows were caused by faulty switches or electrical wiring - especially the wires running between the door and the vehicle body that are subjected to repeated flexing. In these cases, the window might operate intermittently when the door is opened and closed. While this may still be the case on newer cars, it is increasingly common to find window motor problems that originate with a control module. Still, the switches and wiring should be checked thoroughly before replacing a window motor.

If one of the windows in a vehicle will not open or close properly, a failing door window regulator might be the cause. A window that is moving intermittently, or one that gets stuck on the way up or down, could also indicate a broken regulator. Other symptoms might include a clicking, chattering, or grinding noise when the window moves. In some cases a severely damaged window regulator could cause the window to drop inside the door.

When a switch can not make contact and close the circuit, the window cannot be raised and lowered. If the switch on the driver's door will not raise or lower the window in question, but the switch on the corresponding door works just fine, this is a good indication that there is a switch failure. This works the other way around, as well. If the switch on the door does not cause the window to function, but the driver's switch does, that is an indication of a passenger door window switch failure.

Due to the nature of electrical systems on modern vehicles, the range of problems these can cause are nearly limitless. However, there is a way to categorize them in two ways. Permanent and intermittent problems. Permanent problems appear and remain. This may be the vehicle will not start, the radio does not work, or the door chime will not turn off among many, many others. These problems are more straight-forward to diagnose since they present themselves at all time. This means there will always be a fault to find. Intermittent electrical problems, however, can be difficult or impossible to locate, since they appear then disappear without warning. The best case scenario for an intermittent issue is when replicating the problem is easily accomplished and understood. This allows a technician to make an issue semi-permanent, allowing them to find the fault. Other issues that come and go without warning and cannot be replicated on demand must occur when the technician is servicing the vehicle, otherwise there is no problem to correct. It is most important to understand that electrical system faults always require inspection, and can include the vehicle working in any manner, or not working at all.

Like we noted in the last section, general diagnosis symptoms are the most vague of the bunch. There are several diagnostic spectrums, electrical diagnosis, drivability diagnostics, engine diagnostics, transmission diagnostics, and the list could continue for about 5 or 10 more spectrums of diagnostics. The most important take-away here, is that general diagnostics are diagnostics that have no other spectrum in which they fit, or the problem is unknown. This means that any vehicle left outside of a repair facility with the keys and an authorization to perform diagnosis will be diagnosed under the general diagnosis spectrum.

What steps should I take to diagnose the window issue in my 2018 Mercedes-Benz GLC350e?

When diagnosing a window issue in your 2018 Mercedes-Benz GLC350e, it's essential to adopt a systematic approach that begins with the simplest solutions before progressing to more complex diagnostics. Start by checking the window switch to ensure it is operational; a malfunctioning switch can often be the root of the problem. Next, inspect the fuse box for any blown fuses related to the window system, as replacing a blown fuse is a straightforward fix that can restore functionality. If the switch and fuses are in good condition, listen for the window motor when you press the switch; if you hear it running but the window remains stationary, this may indicate a problem with the window regulator or motor. Carefully examine the window regulator for any visible damage or wear, as these components are crucial for window movement. Additionally, inspect the wiring for any signs of damage or loose connections, as these can disrupt the electrical flow necessary for operation. If these steps do not resolve the issue, it may be time to consult a professional mechanic or dealership for a comprehensive diagnosis and repair, ensuring that your vehicle's window system is restored to proper working order.

What are the common problems that could cause the windows to stop functioning in a 2018 Mercedes-Benz GLC350e?

When dealing with window malfunctions in a 2018 Mercedes-Benz GLC350e, it's essential to understand the common problems that could be at play. One frequent issue is window regulator failure, which can prevent the window from moving up or down as intended. Additionally, a faulty window motor may hinder the window's operation, as it is responsible for providing the necessary power. Electrical issues, such as blown fuses or damaged wiring, can also disrupt window functionality, making it crucial to inspect the vehicle's electrical system. Another potential culprit is a malfunctioning window switch, which may fail to send the correct signals to the window mechanism. Lastly, if the window is misaligned or off its track, it may struggle to operate smoothly, leading to further complications. By recognizing these common problems, DIY enthusiasts can take the necessary steps to troubleshoot and resolve window issues, ensuring optimal performance of their vehicle's windows.

How urgent is the window malfunction in my 2018 Mercedes-Benz GLC350e, and what steps should I take to address it?

When faced with a window malfunction in your 2018 Mercedes-Benz GLC350e, it is crucial to act swiftly to mitigate potential risks. A malfunctioning window can compromise your vehicle's security, leaving it vulnerable to theft or damage, especially if the window is stuck in an open position. Additionally, a faulty window can distract you while driving, impacting your overall safety. Start by assessing the severity of the issue; if the window is partially open or closed, take immediate steps to secure your vehicle. Inspect the fuses related to the window system, as a blown fuse can often be the culprit behind the malfunction. If the fuses are intact, check the window switch for functionality, as a defective switch may require replacement. If these initial checks do not resolve the issue, it is advisable to consult a certified mechanic or an authorized Mercedes-Benz service center. Promptly addressing the malfunction not only ensures your safety and comfort but also prevents further complications that could lead to more extensive repairs down the line.

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2018 Mercedes-Benz GLC350e Window Troubleshooting Guide