* Blown Fuse: This is the easiest and cheapest fix. Check your owner's manual for the fuse box location and diagram, and look for the fuse related to the power windows. A simple replacement might solve the problem.
* Window Switch Failure: The switch itself might be faulty. It's a common point of failure, especially with age and frequent use. Try the other window switches – if they work, the problem is likely the driver's side switch.
* Window Regulator Failure: The regulator is the mechanical part that moves the window up and down. Worn gears, broken cables, or a motor problem within the regulator are common causes of failure. This is often the most expensive repair.
* Wiring Issues: A break or short in the wiring harness between the switch, the regulator, and the power source can prevent the window from working. This can be difficult to diagnose and repair. Look for any obvious signs of damage to the wiring near the door.
* Power Window Motor Failure: The motor itself might have burned out. This is a component within the regulator assembly.
* Central Locking Module: In some vehicles, the central locking module is involved with the power windows and a fault here can cause them to stop working. This is less likely but possible.
* Body Control Module (BCM): While less frequent, a faulty BCM could interfere with the power window function. This is generally a more involved diagnosis and repair.
Troubleshooting Steps:
1. Check the fuse: This is the first and easiest step.
2. Test other switches: See if the passenger side windows work.
3. Listen for motor sounds: When you press the switch, do you hear any clicking or humming from the door? Absence of sound suggests motor or regulator problems.
4. Manually check the window: See if you can manually move the window up or down (you might need to remove the interior door panel to access the mechanism safely). If this is possible, the problem is likely the switch or motor.
If you can't identify the problem yourself, it's best to take your Expedition to a mechanic or auto electrician for a professional diagnosis and repair. They have the tools and experience to pinpoint the exact cause and fix it efficiently.
