A failing rear windshield wiper motor can be a real inconvenience, especially during inclement weather. Recognizing the signs early can prevent further damage and ensure your visibility remains clear. Common indicators include unusual noises, erratic wiper movement, or the wiper not functioning at all. Understanding these symptoms can help you diagnose and address the issue promptly.

How to Identify a Failing Rear Windshield Wiper Motor

What Are the Common Symptoms?

Identifying the symptoms of a failing rear windshield wiper motor is crucial for timely repairs. Here are the primary signs to watch for:

• Unusual Noises: If you hear grinding or whining sounds when the wiper is in use, this could indicate a motor problem.

• Erratic Movement: Wipers that move slower than usual, jerk, or stop mid-sweep suggest motor issues.

• Non-Functioning Wiper: The most obvious sign is when the rear wiper does not activate at all, despite being turned on.

• Inconsistent Speed: If the wiper speed fluctuates without changing settings, the motor might be failing.

Why Does the Rear Wiper Motor Fail?

The rear windshield wiper motor can fail for several reasons:

• Wear and Tear: Over time, the motor components can wear out, leading to failure.

• Electrical Issues: Faulty wiring or a blown fuse can disrupt the motor’s function.

• Mechanical Blockage: Debris or ice buildup can strain the motor, causing it to fail.

• Corrosion: Exposure to moisture can lead to rust, affecting the motor’s performance.

How to Test a Rear Wiper Motor?

Testing the rear wiper motor can help confirm if it’s the source of the problem. Here’s a simple process you can follow:

1. Check the Fuse: Locate the fuse box and inspect the wiper fuse. Replace it if it’s blown.

2. Listen for the Motor: Turn on the wiper and listen for motor sounds. Silence may indicate a motor or electrical issue.

3. Inspect Wiring: Look for damaged or loose wires connected to the motor.

4. Manual Movement: Try moving the wiper arm manually. If it moves freely, the motor might be the issue.

What Are the Costs of Replacing a Rear Wiper Motor?

Replacing a rear wiper motor can vary in cost depending on the vehicle make and model. Here’s a general idea:

Vehicle Type	Estimated Cost (Parts & Labor)
Sedan	$150 – $300
SUV	$200 – $350
Truck	$250 – $400

Factors influencing cost include labor rates and the motor’s brand.

How to Prevent Rear Wiper Motor Failure

Preventive measures can extend the lifespan of your rear wiper motor:

• Regular Maintenance: Clean the wiper blades and arms regularly to prevent buildup.

• Protect Against Elements: Use a cover to shield your vehicle from extreme weather.

• Inspect Routinely: Regularly check for signs of wear and address issues promptly.

Can You DIY Replace a Rear Wiper Motor?

Replacing a rear wiper motor yourself is possible if you’re handy with tools. Here’s a simplified guide:

1. Gather Tools: You’ll need screwdrivers, a wrench, and a new motor.

2. Disconnect Battery: This ensures safety while working on electrical components.

3. Remove Wiper Arm: Detach the wiper arm using a wrench.

4. Access Motor: Remove the interior panel to access the motor.

5. Replace Motor: Unbolt the old motor and install the new one.

6. Reassemble: Reattach the panel and wiper arm, then reconnect the battery.

When to Seek Professional Help?

If you’re unsure about diagnosing or replacing the motor, it’s best to consult a professional. This ensures the job is done correctly and prevents further issues.

People Also Ask

How Long Does a Rear Wiper Motor Last?

A rear wiper motor typically lasts between 5 to 10 years, depending on usage and maintenance. Regular checks and timely repairs can extend its lifespan.

Can a Faulty Wiper Motor Drain the Battery?

Yes, a faulty wiper motor can cause a battery drain if it continuously draws power due to a short circuit or electrical issue.

What Causes Rear Wiper Motors to Burn Out?

Motors can burn out due to excessive use, electrical faults, or mechanical blockages that force the motor to overwork.

Are Rear Wiper Motors Covered Under Warranty?

Many vehicle warranties cover rear wiper motors, especially if the failure occurs within the warranty period. Check your warranty details for specifics.

Can Weather Conditions Affect Wiper Motor Performance?

Extreme weather, such as ice or heavy rain, can strain the wiper motor, potentially leading to premature failure.

Conclusion

Understanding the signs of a failing rear windshield wiper motor can help maintain your vehicle’s safety and functionality. By recognizing symptoms early and taking preventive measures, you can avoid costly repairs and ensure clear visibility during adverse weather conditions. If you suspect an issue, consider consulting a professional for a thorough inspection and repair. For more car maintenance tips, explore our guide on vehicle upkeep.