1. Preliminary Checks:
* Check the Fuse: Locate your fuse box (usually under the hood or under the dashboard). Consult your owner's manual to find the fuse for the power windows. Replace it if it's blown.
* Check the Switch: Test the window switch. If the switch feels loose or unresponsive, it might be faulty. Try using a different switch (if your car has multiple window switches) to see if the problem lies with the switch or the window itself.
* Listen for Sounds: When you operate the switch, listen carefully. Do you hear a clicking sound (potentially a relay or motor issue)? A whirring sound (motor struggling)? Silence (likely a broken wire or regulator)?
2. Common Problems and Solutions:
* Blown Fuse (already mentioned): This is the easiest fix. Replace the fuse with one of the same amperage rating. If the fuse blows again immediately, there's a short circuit somewhere in the system.
* Faulty Window Switch: These can be replaced relatively easily. You'll need to remove the door panel to access it. Replacement switches are available from auto parts stores.
* Broken Window Regulator: This is a common problem. The regulator is the mechanism that moves the window up and down. It can break due to age, wear, or if the window is forced. Repairing a regulator is often difficult; replacing it is usually the more practical solution. This requires removing the door panel.
* Broken Window Motor: The motor is responsible for driving the regulator. Testing its function often requires disconnecting it from the regulator and testing with a multimeter. Replacement is usually the solution.
* Wiring Issues: Worn or broken wires within the door harness are common. These can be difficult to trace and repair, requiring potentially significant disassembly of the door. Look for fraying or broken wires near the door hinges, where they bend frequently.
* Jammed Window: If the window is stuck, try to gently move it up and down manually. There might be an obstruction.
3. Repairing the Regulator/Motor (Most involved):
* Removing the Door Panel: This is the most challenging part for most people. There are usually screws and clips holding it in place. You'll need to carefully pry it off to avoid breaking clips. Consult a repair manual specific to your 1990 Oldsmobile Cutlass Ciera LS for detailed instructions on removing your door panel. YouTube videos can also be helpful, but always be cautious.
* Accessing the Regulator/Motor: Once the door panel is removed, the regulator and motor will be visible.
* Replacement: It's generally easier and more cost-effective to replace the entire regulator assembly, rather than attempting a complex repair of individual parts. Obtain a replacement from an auto parts store (mention the year, make, and model of your car). Installation involves reversing the disassembly steps.
Important Considerations:
* Repair Manual: A repair manual specific to your 1990 Oldsmobile Cutlass Ciera LS is invaluable. It provides detailed diagrams and instructions.
* Safety: Disconnect the battery negative terminal before working on the electrical system.
* Tools: You'll need basic hand tools like screwdrivers (Phillips and flathead), possibly a socket set, and possibly a panel removal tool.
* Patience: Working on car repairs can be time-consuming and sometimes frustrating.
If you're not comfortable working on car repairs yourself, it's best to take your car to a qualified mechanic. The cost of professional repair might be less than the cost of purchasing tools and the time spent struggling with a complex repair, especially if you damage something in the process.
