Unfortunately, there's no single "fix" for a malfunctioning windshield wiper switch because the problem could stem from several sources:
* The switch itself is faulty: This is the most common cause. The switch is a wear-and-tear item, and internal contacts can wear out, causing intermittent operation or complete failure. The only fix in this case is replacement. You'll need to purchase a new switch from a parts store (providing your year and model is known, they can get the correct one).
* Wiring issues: A broken or corroded wire leading to the switch can prevent proper function. This requires tracing the wiring harness, identifying the break, and repairing or replacing the damaged wire.
* Fuse blown: A blown fuse in the wiper circuit will stop the wipers entirely. Check your owner's manual to locate the wiper fuse and replace it if necessary.
* Wiper motor problem: Though less likely to be the direct cause of a switch malfunction, a failing wiper motor can sometimes cause the switch to behave erratically or not register commands correctly.
To troubleshoot:
1. Check the fuse: This is the easiest and quickest step.
2. Inspect the switch: Look for any obvious signs of damage or looseness. A loose connection could be causing intermittent issues.
3. Test the wiring: This is more advanced and requires some electrical knowledge. You may need a multimeter to check for continuity in the wiring.
4. Consider the wiper motor: If the switch seems fine, and the fuse is good, the motor may be the culprit. You can often test this by directly applying power to the motor (with caution!) to see if it works.
Replacing the switch: This is usually a fairly straightforward procedure but varies slightly depending on the year of your Taurus/Sable. You'll generally need to:
1. Remove the steering column shroud: This involves removing some screws and possibly disconnecting some other components (like the turn signal and headlight switches).
2. Disconnect the wiring harness: Carefully unplug the electrical connector from the back of the wiper switch.
3. Remove the old switch: Often it's held in place with a retaining clip or screw.
4. Install the new switch: Reverse the removal process. Ensure the new switch is correctly seated and the connector is securely plugged in.
5. Reassemble: Put everything back together.
Important Notes:
* Consult a repair manual: A repair manual specific to your year and model of Ford Taurus/Mercury Sable will provide detailed instructions and diagrams for replacing the wiper switch and troubleshooting related electrical issues. These manuals are available online or at auto parts stores.
* Disconnect the battery: Before working on any electrical components, disconnect the negative terminal of your car battery to prevent short circuits.
* If you're not comfortable working on car electrical systems: Take it to a qualified mechanic. Improper wiring can damage your car's electrical system.
Without the year of your Ford Taurus or Mercury Sable, it's impossible to give more specific instructions. Providing the year will allow for more accurate advice.
