Mercedes-Benz CL55 AMG Window Won't Go Up Or Down

Common Causes of Window Malfunctions in Your Mercedes-Benz CL55 AMG and How to Fix Them

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Reviewed by
Devin Cabugcal
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 CL55 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 CL55 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.

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 CL55 AMG

When addressing window operation issues in your Mercedes-Benz CL55 AMG, start by checking the simplest components first. Begin with the fuses and relays, as a blown fuse can cause all windows to stop functioning. If the fuses are intact, proceed to test the window switches and the window motor, as these are common culprits for malfunctioning windows. Utilizing a diagnostic tool like the YOUCANIC Full System Scanner can help you read error codes that may indicate specific problems within the electrical system. If the windows still do not operate correctly, try performing a window reset by fully opening and closing the window while holding the switch for a few seconds after the glass stops moving. This recalibration can often resolve minor glitches. Additionally, inspect the door strap for damage, as it may cause the window to drop unexpectedly. If these steps do not yield results, you may need to remove the door panel to check for wiring issues or replace the window regulator. By following this structured approach, you can effectively diagnose and resolve window issues in your vehicle, ensuring a smoother driving experience.

What to Check When the Window Won't Move in a Mercedes-Benz CL55 AMG?

When troubleshooting a non-moving window in your Mercedes-Benz CL55 AMG, it's crucial to identify the common problems that may be causing the issue. Begin by examining the window switch and its connections, as a faulty switch can lead to intermittent or complete failure of the window's operation. Next, inspect the window regulator and motor for any signs of wear or damage; a malfunctioning regulator may result in slow movement or unusual noises, indicating that it may need replacement. Be attentive to additional symptoms, such as the window only moving in one direction or stopping unexpectedly, as these can provide valuable insights into the underlying problem. If the motor is silent, it’s advisable to revisit the window switch to check for any contact issues. Furthermore, ensure that the fuse or circuit breaker for the window is functioning properly and that the wiring harness is intact, free from damage or intermittent connections. By systematically checking these components, you can effectively diagnose and resolve the reasons behind your window's malfunction, enabling a successful DIY repair.

What to Do When Your Mercedes-Benz CL55 AMG Window Won't Go Up or Down?

When your Mercedes-Benz CL55 AMG window fails to operate, it’s crucial to address the issue without delay. Ignoring the problem can lead to more significant complications, such as electrical failures or damage to the window mechanism, which may result in costly repairs. Additionally, a malfunctioning window can compromise your vehicle's security and expose you to the elements, creating an uncomfortable driving experience. Start by checking the fuse and relay, as these are often the simplest culprits. If these components are functioning correctly, inspect the window motor and regulator, as a failure here can prevent the window from moving altogether. Performing a window reset can sometimes resolve minor glitches, so don’t overlook this step. Pay attention to any unusual sounds or behaviors, as they can provide vital clues about the underlying issue. Lastly, ensure the window switch is clean and functioning properly, as a faulty switch can also hinder operation. By taking these steps promptly, you can mitigate risks and ensure your vehicle remains safe and functional.

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