The Most Common Causes of Power Window Failure

Power windows are a common feature in most modern vehicles, allowing drivers and passengers to open and close windows at the press of a button. However, they may fail for different reasons, such as a damaged window regulator resulting in slow window movement, a burned-out motor that fails to respond, or a blown fuse due to a surge. Bad switches, dirty or bent tracks, weather damage, child safety locks, and broken glass may also cause malfunction and might need power window repair service.

Causes of Power Window Malfunction

Here are some common reasons why power windows stop working:

Faulty Window Regulator

The window regulator is the mechanical component that operates the window up and down. Regulators wear out or get damaged over time due to constant use. Symptoms of a malfunctioning regulator include:

• A slow-moving or stuck window.
• Clicking or grinding sounds when operating the switch.
• The window tilting or falling inside the door.

If the regulator is damaged, it has to be replaced.

Burnt-Out Window Motor

The window motor drives the regulator to move the window. The window will no longer move if the motor burns out or dies. Some of the indications of a dying window motor include:

• The window does not move when you flip the switch.
• No motor sound.
• The motor clicks but does not operate the window.

A malfunctioning window motor should be replaced to restore proper operation.

Blown Fuse

A fuse guards the electrical elements of the power window system. When the fuse blows, the window will no longer work. A blown fuse may be caused by:

• A power surge.
• A wiring short circuit.
• An overloaded electrical system.

You can check your car’s fuse box to see if a fuse needs replacing. If the new fuse keeps blowing, an auto glass professional should inspect the system for deeper electrical issues.

Bad Window Switch

The switch regulates the power flow to the window motor. If the switch is bad, it will not provide power to the motor, and the window will not move. Signs of a bad switch are:

• The window operates at times.
• All other windows function properly, with one not operating.
• There is no window motor sound when the switch is pressed.

If you suspect the switch is faulty, swap it with another one (if your vehicle has multiple identical switches) or test it with a multimeter.

Window Track Problems

The window glides up and down within a track. The window will struggle to move if the track is dirty, dented, or crooked. Symptoms of track issues include:

• The window is not moving evenly or sticking.
• Unusual sounds when operating the window.
• The window is difficult to roll up and down by hand.

Cleaning the track or readjustment may fix the problem.

Weather Damage

Power windows may be affected by very cold or damp conditions. While extreme heat can make parts expand and fail, cold temperatures could make windows stuck. Electrical components can also suffer from water in the door panel. To avoid problems caused by the weather:

• Park your vehicle in a garage or covered location.
• Apply silicone spray on window tracks in winter to prevent freezing.
• Check for any leaks that could admit water inside the door.

Child Safety Lock Activation

Most vehicles have a child-safety lock function preventing back windows from operating. If this setting is accidentally turned on, the rear windows won’t operate. Examine your car’s manual to find the child lock switch and ensure it is off.

Broken Window Glass

If your car window glass is cracked or broken, it can fail to work properly. Cracked or broken glass can shift inside the door panel, causing the window to jam or malfunction. If your window glass is cracked or broken, replace it immediately.

How to Fix a Power Window That Won’t Work?

If your power window is not functioning, attempt the following procedures to diagnose the problem:

• Check the other windows: If none work, it could be a fuse or electrical issue.
• Test the window switch: Try the passenger-side switch if the driver-side switch won’t work.
• Listen for noises: Grinding or clicking noises may mean motor or regulator malfunction.
• Check the fuse box: Replace any shattered fuses and see if the window works.
• Try a system reset: Some cars have a reset function for power windows, as described in the owner’s manual.
• Inspect the wiring: Check for damaged or worn-out wires inside the door panel.

If none of the above works, it is advisable to call a professional to avoid further damage.

Conclusion

Several issues, such as defective regulators, burnt motors, blown fuses, or defective switches, can cause power window malfunctions. Weather damage and broken glass can also cause power windows to stop working. If your car’s power window is not functional, check it for minor malfunctions immediately and get professional power window repair done for serious malfunctions. Regular maintenance can prevent most of these issues so that your power windows function without hassle for years.