1. Window Regulator: This is the most common cause. The regulator is the mechanical part that moves the window up and down. It's possible it's broken, jammed, or has a faulty motor. This is often due to wear and tear, especially with age. You'll likely need to replace the entire regulator assembly.
2. Window Motor: The motor within the regulator assembly may have burned out. This is less common than a regulator failure, but still possible. Again, replacement of the regulator assembly is usually the solution, as the motor is integrated into it.
3. Window Switch (Passenger Side): The switch on the passenger door itself might be faulty. Try swapping it with the driver's side window switch (if it's the same type). If the problem moves to the driver's side, you've found the culprit.
4. Wiring: There could be a break or short in the wiring harness leading to the passenger window motor. This is less likely if *both* switches are not working, but it's worth checking for frayed or damaged wires, especially around the door hinges where the wires flex a lot.
5. Fuse: While less probable if neither switch works, check your owner's manual for the window fuse and verify it's not blown. Sometimes a blown fuse can affect only one window.
6. Body Control Module (BCM): The BCM controls various electrical functions in the car. A faulty BCM is less likely but possible. This is a more complex issue requiring diagnostic tools and potentially professional help.
Troubleshooting Steps:
1. Check the Fuse: This is the easiest and quickest thing to do.
2. Inspect the Wiring: Look for any obvious damage to the wires running from the door to the body of the vehicle, focusing on areas where the wires flex.
3. Test the Passenger Switch: If possible, swap it with the driver's side switch to rule it out.
4. Access the Window Regulator: This requires removing the door panel (there are many online tutorials for this specific year and model). Once you have access, you can visually inspect the regulator and motor for any obvious damage or binding. You may be able to test the motor with a multimeter, but this requires some electrical knowledge.
Important Note: Repairing a window regulator usually requires removing the door panel. This is not a beginner-level repair. If you're not comfortable working on car mechanics, it's best to take it to a qualified mechanic or auto repair shop. Replacing the regulator is often the most cost-effective solution, even if it's only the motor that's bad. Buying a used regulator assembly can save money, but there's no guarantee of its lifespan.
