* Window Regulator: This is the most common culprit. The regulator is the mechanical system that raises and lowers the window. A broken or worn-out regulator, particularly the motor or cable, can allow the window to go down but not have the power to pull it back up. This is often due to age and wear.
* Window Motor: Similar to the regulator, a faulty window motor can prevent the window from going up. It might be burnt out, seized, or have internal problems.
* Switch: The power window switch itself could be malfunctioning. It might be internally broken, causing a short circuit that allows power to go down but not return up. Try testing other windows with the driver's side switch to see if the problem is the switch itself, or wiring related to it.
* Wiring: A break or short circuit in the wiring harness between the switch, motor, and regulator can also cause this problem. This is more likely if the problem is intermittent or only happens under certain conditions. Corrosion is a common issue in older cars.
* Fuse: While less likely, a blown fuse specific to the window motor could prevent it from working. Check your fuse box for a blown fuse related to the power windows.
* Relay (Less Likely): Some power window systems use relays. A faulty relay could also be the problem, but this is less common than the other causes.
Troubleshooting Steps:
1. Check the Fuse: Locate the fuse for the power windows in your owner's manual and check if it's blown.
2. Test the Switch: Try using other window switches to operate the driver's side window. If it works with another switch, the problem is likely the driver's side switch.
3. Listen for Motor Noise: When you try to raise the window, listen carefully for any sounds coming from the door. A whirring sound indicates the motor is trying to work, but might be failing. Silence suggests a more serious problem with the motor, regulator, or wiring.
4. Visual Inspection: If possible, remove the door panel (carefully, noting how everything comes apart) to visually inspect the regulator and motor. Look for broken cables, stripped gears, or any obvious damage.
In short: The most likely causes are a faulty window regulator or motor. A thorough visual inspection after removing the door panel is generally needed for a proper diagnosis. If you're not comfortable working on car repairs, it's best to take it to a mechanic.
