2004 Subaru Forester Windshield Wiper Motor: Failure Symptoms & Replacement Guide
A complete guide to diagnosing, replacing, and sourcing a new or used windshield wiper motor for your 2004 Subaru Forester.
- The most common cause of failure is a burned-out motor, often from being used while wipers are frozen to the glass.
- Symptoms include wipers not moving, moving slowly, not parking correctly, or only working on high speed.
- There are no specific recalls or TSBs for this part on the 2004 Forester.
- A used OEM motor (part # 86511SA030) is a reliable and cost-effective alternative to potentially scarce new OEM parts or lower-quality aftermarket units.
Symptoms of a Failing Wiper Motor
A bad wiper motor on a 2004 Forester can manifest in several ways. Diagnosing the issue correctly can save you from replacing parts that aren't broken. Watch for these common signs of failure.
- Wipers Don't Move at All: This is the most obvious symptom. If you turn on the wipers and nothing happens, and you don't hear a humming sound from the motor area, the motor itself may have failed. Before condemning the motor, always check the wiper fuse first.
- Slow or Erratic Wiper Speed: If the wipers move much slower than usual, or their speed changes randomly, the motor could be wearing out or suffering from high internal resistance.
- Wipers Only Work on High Speed: When the low and intermittent speed settings stop working but the high-speed setting still functions, it often points to a failure in the motor's internal circuitry or a related resistor.
- Wipers Won't Park Correctly: A healthy wiper system will return the blades to the bottom of the windshield when turned off. If your wipers stop in the middle of the glass or wherever you turn them off, the motor's internal 'park' switch has likely failed. 🎬 See this guide on diagnosing and repairing common Subaru wiper issues.
- Humming or Grinding Noises: A distinct humming sound from the cowl area when the wipers are on (or supposed to be on) can mean the motor is receiving power but is unable to move, possibly due to a stripped internal gear or a seized linkage.
Pro Tip: A common cause of sudden wiper motor failure on Foresters is activating the wipers when the blades are frozen to the windshield. The strain can burn out the motor or strip the gears in the linkage. Some owners have also reported that a bad ground connection can cause the motor to stop working. Before replacing the motor, consider creating a new ground wire from the motor's metal housing to a clean spot on the vehicle's chassis as a potential fix.
🎬 Watch: This video shows how a bad ground causes wiper failure.Known Issues, Recalls, and Technical Service Bulletins (TSBs)
As of early 2026, there are no active recalls or specific Technical Service Bulletins (TSBs) from Subaru or the NHTSA for the windshield wiper motor on the 2004 Subaru Forester. While other Subaru models have had recalls for wiper motor issues related to overheating when obstructed by snow, the 2004 Forester is not included. However, the failure mode is relevant, and owners should always clear heavy snow and ice from the cowl area before operating the wipers to prevent damage.
Buying a Used 2004 Forester Windshield Wiper Motor
Purchasing a used OEM wiper motor can be a smart, cost-effective solution, especially since new OEM stock may be limited. Here’s what to look for to ensure you get a quality part.
- Verify the Part Number: The primary OEM part number for the 2004 Forester is 86511SA030. Confirm this with the seller to guarantee compatibility with X, XS, and XT trims.
- Inspect the Connector: Check photos or inspect the part in person for any signs of corrosion, melted plastic, or bent pins on the electrical connector. A damaged connector is a major red flag.
- Check the Output Shaft: Look at the splined shaft where the wiper linkage attaches. Ensure the splines are clean and not stripped.
- Ask About Mileage: If possible, find out the mileage of the vehicle the motor came from. A motor from a lower-mileage Forester is generally a better bet.
- Warranty and Return Policy: Only buy from sellers who offer a warranty and a clear return policy. This protects you in case the part is defective. Even a 30-day warranty provides enough time to install and test the motor.
- Why Used OEM is a Good Choice: A used original Subaru motor often provides better longevity and a more precise fit than a cheap, new aftermarket alternative. The quality control on OEM parts is typically higher, reducing the risk of premature failure.
Cost of Replacing a 2004 Forester Wiper Motor
The cost can vary significantly depending on the part source and who performs the labor.
| Part/Service | Estimated Cost | Notes |
|---|---|---|
| New OEM | $115 - $160 | Part number 86511SA030 may be discontinued or have limited availability from dealers. |
| New Aftermarket | $80 - $210 | Prices vary by brand and retailer. Available from stores like Advance Auto Parts and AutoZone. |
| Used OEM | $25 - $75 | A cost-effective option from salvage yards or online sellers like eBay. |
| Shop Labor | $100 - $200 | Typically 1-1.5 hours of labor. Dealer rates will be higher. |
| Total DIY Cost | $25 - $210 | Depends on whether you choose a used OEM or new aftermarket part. |
| Total Shop Cost | $200 - $370+ | An independent shop using an aftermarket part will be on the lower end; a dealer using an OEM part will be higher. |
Replacement Walkthrough & Difficulty
Replacing the wiper motor is a manageable DIY task for those with basic mechanical skills. The installation difficulty is approximately 3 out of 5.
- Access the Motor: The motor is located under the plastic cowl panel at the base of the windshield. You will first need to remove the wiper arms. Mark their 'parked' position on the windshield with tape before removal. Then, carefully pry up the plastic clips holding the cowl in place and remove it.
- Disconnect Linkage and Wiring: With the motor visible, disconnect the electrical harness. Then, unbolt the wiper linkage arm from the motor's output shaft.
- Remove the Motor: Unbolt the few bolts holding the motor assembly to the firewall and remove it from the vehicle.
- Install the New Motor: Bolt the new motor into place.
- Set the Park Position:
Important: Before connecting the wiper linkage, plug in the new motor's electrical connector and cycle the wipers on and off once using the steering column switch. This allows the motor to stop in its natural 'park' position. Failure to do this can result in the wipers parking in the wrong spot or having an incorrect range of motion.
- Reassemble: With the motor parked, re-attach the wiper linkage. Reinstall the cowl and wiper arms, aligning them with the tape marks you made earlier. Test the wipers with a wet windshield to confirm proper operation. 🎬 Watch: A step-by-step walkthrough of the wiper motor replacement process.
Frequently Asked Questions (FAQ)
My wipers stopped working. Is it the fuse or the motor?
Always check the fuse first. It's a cheap and easy fix. If the fuse is good but you hear a humming sound when you turn the wipers on, the motor is likely seized or the linkage is jammed. If there's no sound and the fuse is good, the motor has probably failed internally.
Can I replace just the motor without the linkage?
Yes. The motor and the wiper linkage (transmission) are separate components, though they are sometimes sold as an assembly. For the 2004 Forester, you can typically buy and replace just the motor.
Why do my wipers stop in the middle of the windshield?
This is a classic symptom of a failed 'park' switch inside the wiper motor. The motor itself may still be strong enough to move the wipers, but it has lost the ability to know when to stop at the bottom of its cycle. The motor must be replaced to fix this issue.
Is an aftermarket wiper motor okay to use?
High-quality aftermarket motors can be a good option, but cheap ones can fail prematurely. A used OEM motor from a reputable salvage yard is often a safer bet for fitment and reliability than a low-cost, new aftermarket part.
Helpful Videos
Technical Specifications
OEM Part Numbers: 86511SA030
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Subaru Forester:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Symptoms of a Failing Wiper Motor
- Known Issues, Recalls, and Technical Service Bulletins (TSBs)
- Buying a Used 2004 Forester Windshield Wiper Motor
- Cost of Replacing a 2004 Forester Wiper Motor
- Replacement Walkthrough & Difficulty
- Frequently Asked Questions (FAQ)
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