Mercedes-Benz CL600 Window Won't Go Up Or Down

Common Causes of Window Malfunctions in Your Mercedes-Benz CL600 and How to Fix Them

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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 CL600 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 CL600 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 CL600

When addressing window operation issues in your Mercedes-Benz CL600, it's essential to adopt a methodical diagnostic approach. Start by checking the simplest components, such as the fuses and relays, to ensure they are functioning properly. If these are intact, proceed to test the window motor by connecting a test light to its leads; if the light illuminates when you operate the switch, the motor is likely working. Next, inspect the window regulator, as failures in this component are common in the CL600. If the regulator appears to be in good condition, consider performing a window reset, which can recalibrate the system and resolve minor glitches. Additionally, if you suspect the window closed memory needs resetting, follow the specific procedure outlined by Mercedes-Benz to restore its functionality. In some cases, disconnecting the battery for a brief period can also help; just remember to lower all windows first and hold the switch in the up position after reconnecting. By following this structured approach, you can effectively diagnose and resolve window issues, ensuring your vehicle's windows operate smoothly.

How to Diagnose Window Malfunction in a Mercedes-Benz CL600?

When diagnosing a window malfunction in a Mercedes-Benz CL600, it's essential to be aware of the common problems that can arise. One frequent issue is a faulty window switch or blown fuses, which can prevent the window from operating altogether. If you hear a grinding noise or notice that the window moves slowly or only partially, this could indicate a problem with the window motor or regulator. Additionally, if the window goes down but fails to come back up, it may suggest a more complex electrical issue. A useful troubleshooting technique involves resetting the system by disconnecting the battery for 15 minutes, which can sometimes resolve electronic glitches. By understanding these common failure modes and their symptoms, you can more accurately pinpoint the source of the malfunction and take the necessary steps to fix it.

How to Fix a Non-Operating Window in a Mercedes-Benz CL600?

When dealing with a non-operating window in your Mercedes-Benz CL600, it's essential to act promptly to avoid further complications. Ignoring symptoms such as unusual noises, slow movement, or complete lack of response can lead to more significant issues, including potential damage to the window regulator or motor. Start by diagnosing the problem accurately; this may involve checking the window switch for cleanliness and functionality, as well as inspecting the wiring for any signs of wear or damage. If the window fails to respond at all, consider disconnecting the battery for a few minutes to reset the system, which can sometimes resolve electronic glitches. Remember, timely intervention not only enhances your vehicle's safety but also saves you from costly repairs down the line. By addressing these issues as soon as they arise, you can ensure that your window operates smoothly and reliably.

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