Mercedes-Benz CLA35 AMG Window Won't Go Up Or Down

Troubleshooting Common Issues with Your Mercedes-Benz CLA35 AMG Windows and Effective Fixes

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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 Mercedes-Benz CLA35 AMG 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 Mercedes-Benz CLA35 AMG 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.

Troubleshooting Window Operation Issues in a Mercedes-Benz CLA35 AMG

When faced with window operation issues in your Mercedes-Benz CLA35 AMG, it's essential to adopt a systematic diagnostic approach. Begin by examining the window switch and its connections, as a malfunction here is often the simplest explanation for unresponsive windows. If the switch appears to be functioning correctly, the next step is to inspect the window regulator and motor for any signs of wear or damage, as these components are critical for window movement. If the windows are entirely non-functional, consider performing a window reset, which can recalibrate the system and resolve minor glitches. Additionally, resetting the window closed memory may help; this typically involves holding the window switch in a specific position to re-establish the closed position. Lastly, if issues persist, try raising the windows while holding the switch for a few seconds after turning on the ignition, as this sequence can sometimes restore normal operation. By following this structured approach, you can effectively diagnose and potentially resolve window issues in your vehicle.

What to Do When the Window Won't Go Up or Down in a Mercedes-Benz CLA35 AMG?

When your Mercedes-Benz CLA35 AMG windows refuse to move, it can be frustrating, but understanding common problems can help you troubleshoot effectively. One of the first steps is to check the electrical components, including the fuse and relay associated with the window system, as these are often the culprits behind window malfunctions. If the electrical system checks out, inspect the window motor and regulator for any signs of wear or damage, as these parts are crucial for window operation. Additionally, if you've recently disconnected the battery, resetting the window closed memory may be necessary; this involves holding the window switch until you hear a double click, which re-establishes the window's position settings. Pay attention to any unusual sounds or partial movements, as these can indicate specific issues that may require further investigation. Lastly, don’t overlook the window switch itself; ensure it is clean and securely connected, as dirt or loose connections can hinder its performance. By systematically addressing these common problems, you can often resolve the issue without professional assistance.

Why is it Urgent to Fix a Non-Functioning Window in a Mercedes-Benz CLA35 AMG?

Fixing a non-functioning window in your Mercedes-Benz CLA35 AMG is not just a matter of convenience; it is an urgent necessity that impacts your safety and the vehicle's integrity. A malfunctioning window can obstruct your visibility, making it difficult to navigate safely, especially in emergency situations where quick exits are essential. Additionally, an inoperative window can leave your vehicle vulnerable to theft or unauthorized access, compromising your security. Weather conditions can also wreak havoc on your car's interior, leading to discomfort for passengers and potential damage to upholstery and electronics. Moreover, operational efficiency is hindered when windows fail to function, disrupting ventilation and overall driving comfort. By addressing the issue promptly, you not only enhance your driving experience but also prevent further damage to the window system, which could result in more extensive and costly repairs down the line. Therefore, taking immediate action to fix a non-functioning window is crucial for maintaining the safety, security, and comfort of your vehicle.

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