Experiencing window malfunctions in your Mercedes W220 can be a frustrating inconvenience. Fortunately, resetting the system is a relatively straightforward procedure that you can perform yourself. Whether your windows are stuck, slow, or not responding, a simple reset can restore their functionality and get you back on the road with ease.
Before embarking on the reset process, ensure that the battery in your Mercedes W220 is in good condition, as a weak battery can interfere with the proper functioning of the window system. Additionally, it’s important to note that resetting the windows will erase any personalized settings, such as one-touch up/down or automatic closing. Therefore, it’s a good idea to familiarize yourself with the reprogramming process to restore these preferences once the reset is complete.
To reset the Mercedes W220 window system, follow these steps: Turn the ignition key to the “ON” position but do not start the engine. Locate the window switch for the malfunctioning window and hold it in the “up” position for approximately 30 seconds. Once the window reaches the fully closed position, continue holding the switch for an additional 5 seconds. Repeat this process for all malfunctioning windows, and your system should be successfully reset.
Entering Service Mode for Window Reset
To initiate the window reset process, it is crucial to enter the service mode. Here’s a detailed guide on how to achieve this:
Ignition Key Preparation
| Step | Action |
|---|---|
| 1 | Insert the ignition key and turn it to position 1 (accessory mode). |
| 2 | Wait for the instrument cluster to complete its initialization. |
| 3 | Turn the ignition key to position 2 (on mode) and release it immediately. Do not start the engine. |
Service Mode Activation
Once the ignition key is in position 2, follow these steps to activate service mode:
| Step | Action |
|---|---|
| 4 | Press and hold the “OK” button on the steering wheel. |
| 5 | While holding the “OK” button, turn the ignition key to position 1. |
| 6 | Continue holding the “OK” button for approximately 10 seconds. The instrument cluster will display “Service Mode”. |
Note:
If the service mode is not activated within 60 seconds, the process will need to be repeated from the beginning.
The Secret Sequence: Initiating the Reset
To commence the window reset process, buckle up in the driver’s seat and close all the windows. Start by pressing and holding the driver’s side window switch in the up position for approximately five seconds. Release the switch momentarily, and then press and hold it down again in the up position for another five seconds.
Next, repeat this sequence with the passenger’s side window switch. Press and hold the switch up for five seconds, release it, and then press and hold it up again for another five seconds. Ensure that all windows are fully closed throughout this process.
Finally, with both front windows fully closed, press and hold the rear window switches simultaneously in the up position for five seconds. Release the switches, and then initiate a brief press and hold on both switches for an additional two seconds. This will initiate the window reset sequence, returning your windows to proper functionality.
**Here’s a step-by-step guide in a table for clarity:**
| Step | Action |
|---|---|
| 1 | Close all windows and buckle up in the driver’s seat. |
| 2 | Press and hold the driver’s side window switch up for 5 seconds, release, then press and hold up for 5 seconds again. |
| 3 | Repeat step 2 with the passenger’s side window switch. |
| 4 | Press and hold both rear window switches up simultaneously for 5 seconds, release, then press and hold up for 2 seconds each. |
Resetting the Driver’s Side Window
Step 1: Initialization
Roll the driver’s side window all the way down and then all the way up. Once it reaches the top, hold the window switch in the “up” position for an additional 5 seconds.
Step 2: Reset
Roll the window all the way down again. Before it fully closes, pull the switch up and hold it for an additional 5 seconds. The window will automatically roll up and down to complete the reset process.
Step 3: Troubleshooting
If the reset process does not complete successfully, try the following troubleshooting steps:
| Issue | Solution |
|---|---|
| Window does not move after initialization | Repeat Step 1 multiple times to ensure proper initialization. |
| Window stops mid-reset | Release the window switch and restart the reset process from Step 1. |
| Window continues to operate normally | The reset was successful. Check the window’s functionality before closing the door. |
Restoring the Passenger Side Window
Resetting the passenger side window in a Mercedes W220 involves similar steps to the driver’s side window. However, there are some key differences to be aware of.
First, locate the window switch panel on the driver’s door. The switch for the passenger side window will be on the right-hand side of the panel.
Next, put the key in the ignition and turn it to the “on” position, but do not start the engine.
Then, hold down the passenger side window switch in the “up” position for about 5 seconds. You will hear a clicking sound as the window resets to its fully closed position.
Finally, release the window switch and turn the key to the “off” position. The passenger side window is now reset and should be functioning properly.
If the passenger side window still does not work properly after resetting, there may be a problem with the window motor or switch. In this case, it is best to take your car to a qualified mechanic for further diagnosis and repair.
Troubleshooting the Passenger Side Window
If you are having problems resetting the passenger side window in your Mercedes W220, there are a few things you can check:
- Make sure that the key is in the “on” position, but the engine is not running.
- Check that the window switch is properly connected to the window motor.
- Inspect the window motor for any signs of damage or wear.
- If the window motor is damaged, it will need to be replaced.
- If the window switch is damaged, it will need to be replaced as well.
| Symptom | Possible Cause |
|---|---|
| Window does not move | Faulty window motor |
| Window moves slowly | Faulty window regulator |
| Window makes a grinding noise | Faulty window gears |
| Window falls off track | Faulty window guide |
Troubleshooting Window Reset Failures
If you encounter difficulties resetting your Mercedes windows, consider the following troubleshooting tips:
Check for Obstructions
Inspect the window tracks and channels for any debris or foreign objects. Obstructions can interfere with the window’s movement and prevent proper closing.
Test the Battery
Ensure the vehicle’s battery is in good condition. A weak battery can affect the electrical systems, including the window motors.
Reset the Steering Angle Sensor
The steering angle sensor may need to be recalibrated if it has been disconnected or replaced. This sensor affects the window closing sequence.
Inspect the Switches and Wiring
Examine the window switches and wiring for any damage or loose connections. Faulty switches or connections can prevent the windows from functioning correctly.
Advanced Diagnostics
If the issue persists after following these troubleshooting steps, consider using advanced diagnostic tools such as a Mercedes-Benz STAR diagnostic scanner. These tools provide detailed information on the window system and can help identify specific faults.
If the window reset procedure still fails after troubleshooting, it is recommended to consult with a qualified Mercedes-Benz technician for further assistance.
Resynchronizing the ECU for Complete Functionality
To ensure the ECU (Engine Control Unit) operates flawlessly, resynchronization is crucial. Follow these steps for a comprehensive reset:
6. Resetting Individual Window Modules
Table: W220 Window Module Locations
| Window | Location |
|---|---|
| Driver’s Side Front | Door control module in the door |
| Passenger’s Side Front | Door control module in the door |
| Driver’s Side Rear | Rear SAM (Signal Acquisition Module) |
| Passenger’s Side Rear | Rear SAM |
| Rear Window | Rear SAM |
Using the manufacturer’s diagnostic tool, access the ECU and enter the “Module Configuration” menu. Select the window module for the specific window to be reset. Navigate to the “Adaptations” or “Calibration” section and initiate the reset process.
The diagnostic tool will guide you through the resynchronization routine, ensuring precise communication and proper window operation. Once completed, repeat the process for any remaining window modules.
Advanced Reset Procedures: Electrical Component Faults
In case of electrical component malfunctions, such as intermittent window operation or communication errors, more advanced reset procedures may be necessary. These involve using diagnostic tools to identify and address specific electrical faults.
Using a Diagnostic Tool
Connect a Mercedes-Benz Star Diagnosis or equivalent diagnostic tool to the vehicle’s OBD port. Access the window control module and read any fault codes that may be present. Refer to the diagnostic tool’s documentation for specific troubleshooting guidance based on the fault code(s).
Voltage and Continuity Checks
Perform voltage and continuity checks on the electrical components related to the window operation. Check for proper voltage supply to the window motor, switches, and control module. Test for continuity in the wiring harness between these components to ensure proper electrical connections.
Component Replacement
If the diagnostic tool or electrical checks indicate a faulty component, it may need to be replaced. Common components that may cause window problems include window motors, switches, and the window control module. Follow the manufacturer’s guidelines for component replacement and ensure proper fitment and connections.
Software Updates
In some cases, electrical component faults may be resolved through software updates. Mercedes-Benz releases regular software updates that may include bug fixes and performance improvements. Check for available software updates and apply them as necessary to address potential electrical issues.
Reinitialization of Window Control Module
After replacing electrical components or performing any major electrical work, the window control module may need to be reinitialized. Use the diagnostic tool to access the module and follow the guided reinitialization procedure. This will reset the module’s settings and ensure proper communication with other electrical components.
Safety Precautions: Ensuring a Safe Reset Process
Before embarking on the reset process, it is crucial to adhere to certain safety precautions to ensure a smooth and risk-free experience.
8. Disconnecting and Reconnecting the Battery
This step is paramount to isolating the vehicle’s electrical system and ensuring safety during the reset process. Here’s a detailed rundown of the procedure:
- Park the vehicle on a level surface and engage the parking brake to immobilize it.
- Locate the battery and inspect the terminals for any signs of corrosion or damage. If necessary, clean the terminals using a wire brush or terminal cleaner.
- Identify the negative (-) terminal of the battery and use a wrench to loosen the nut securing the negative battery cable.
- Gently lift the negative battery cable away from the terminal and secure it to prevent it from making contact with any metal parts.
- Wait approximately 10-15 minutes to allow the vehicle’s electrical system to discharge completely.
- Once the waiting period has elapsed, reconnect the negative battery cable to the negative terminal and tighten the nut securely.
By following these steps meticulously, you can effectively disconnect and reconnect the battery, ensuring the safety and integrity of the reset process.
Resetting Windows in Various W220 Models
Resetting Windows in 1999-2002 W220s
Open and close the driver’s side window using the switch. Hold the switch down for another 5 seconds after the window closes. Then open and close the window again, and hold the switch up. Do the same for the passenger window.
Resetting Windows in 2003-2005 W220s
Close all windows and doors. Turn the ignition to position 2 without starting the engine. Lower each window about 3 inches. Turn the ignition off and turn on the exterior lights. Raise each window all the way up and hold the switch for another 5 seconds.
Resetting Windows in 2006-2009 W220s
Lower all the windows. Ignition off. Turn the ignition to position 2, but don’t start the engine. Hold the button up for 20 seconds.
Resetting Moonroof
Press the moonroof button halfway to open it a small amount. Immediately release the button. Press the button halfway again to close the moonroof slightly. Hold the button for 5 seconds while the moonroof is closing. The moonroof will fully close and then reopen about an inch.
Resetting Soft-Close Feature
Close the door. Ignition on. Open the door fully. Gently close the door until you hear a beep. Pull the door open about 6 inches and then close it firmly. Repeat for all doors without starting the engine.
Resetting Anti-Pinch Feature
Close the window completely. Ignition on. Open the window slightly and then close it. Hold the switch until the window fully closes.
Resetting One-Touch Window Function
Lower the window partially. Ignition on. Raise the window fully. Hold the button up for 5 seconds.
Resetting Windows After Battery Replacement
Master reset of all windows. Ignition on. Close all windows. Hold the button up for 5 seconds on the driver’s side window. Repeat for each window.
Table: Mercedes W220 Window Reset Methods
| Model Year Range | Reset Method |
|---|---|
| 1999-2002 | Hold switch down after closing window; repeat for passenger window |
| 2003-2005 | Close all windows; turn ignition to position 2; lower windows slightly; turn ignition off; turn on exterior lights; raise windows fully and hold switch |
| 2006-2009 | Lower all windows; ignition off; turn ignition to position 2; hold button up for 20 seconds |
| Moonroof | Press button halfway to open slightly; release; press halfway again to close slightly; hold for 5 seconds while closing |
| Soft-Close Feature | Close door; ignition on; open door fully; gently close until beep; pull open 6 inches and close firmly |
| Anti-Pinch Feature | Close window completely; ignition on; open slightly; close; hold switch until fully closed |
| One-Touch Window Function | Lower window partially; ignition on; raise window fully; hold button up for 5 seconds |
| Windows After Battery Replacement | Close all windows; ignition on; hold button up for 5 seconds on driver’s side window; repeat for each window |
Resetting Mercedes Windows in a W220
Maintaining your Mercedes W220’s windows in optimal condition is crucial for a comfortable and safe driving experience.
Understanding the proper window reset procedure and addressing any underlying issues can prevent malfunctions and ensure smooth window operation.
Reasons for Window Reset
Window resets may be necessary in various situations, including:
- Window malfunctions, such as slow or erratic movement
- Battery disconnection or replacement
- After-market window tint or film installation
- Electrical system troubleshooting
Reset Procedure
Follow these steps to reset your Mercedes W220’s windows:
- Start by rolling up all the windows completely using the power window switches.
- Once fully closed, continue holding the window switch for an additional 5 seconds.
- Release the window switch and wait for the window to move down slightly and then back up again.
- Repeat this process for all the windows, including the driver’s window.
- Once all windows have been reset, test their operation by rolling them up and down several times.
Troubleshooting Common Issues
If you encounter any issues during the reset process, consider the following:
- Battery voltage: Ensure the vehicle’s battery is fully charged or replaced if necessary.
- Faulty window switches: Replace malfunctioning window switches to fix erratic window movement.
- Door modules: Electrical faults within the door modules can affect window operation; diagnosis and repair may be needed.
- Window motors: In rare cases, window motors may fail and require replacement.
Additional Tips
Follow these tips to maintain optimal window operation:
- Lubricate window tracks regularly to prevent sticking and premature wear.
- Avoid overloading the windows with heavy objects or leaning on them.
- Clean the window switches and door seals to prevent dirt buildup and electrical issues.
- If any windows fail to reset or display persistent malfunctions, seek professional assistance.
How to Reset Mercedes Windows in a W220
If the windows in your Mercedes W220 are not operating properly, you may need to reset them. Here are the steps on how to do it:
-
Close all the windows.
-
Turn the ignition key to the “on” position, but do not start the engine.
-
Press and hold the window switch for the window you want to reset for about 10 seconds.
-
Release the switch and wait about 10 seconds.
-
Press the window switch again to open the window.
-
Repeat steps 3-5 for each window you want to reset.
People Also Ask
How do I fix a jammed Mercedes window?
If one of the windows in your Mercedes W220 is jammed, you can try the following:
- Check to see if there is anything blocking the window’s path.
- Try using the window switch to see if it will move the window.
- If the window still does not move, you may need to reset the window.
How do I reset the sunroof in a Mercedes W220?
To reset the sunroof in a Mercedes W220, follow these steps:
- Close the sunroof.
- Turn the ignition key to the “on” position, but do not start the engine.
- Press and hold the sunroof switch for about 10 seconds.
- Release the switch and wait about 10 seconds.
- Press the sunroof switch again to open the sunroof.
