2021-2025 Toyota Mirai Windshield Wiper Motor: Diagnosis, Replacement, and Buying Used

Symptoms of a Failing Wiper Motor

A faulty wiper motor on a Toyota Mirai will usually show clear signs of failure. Because this is a relatively new vehicle, complete motor burnout is less common than intermittent electrical issues or early mechanical wear. Watch for these specific symptoms:

• Slow or Erratic Wiper Speed: The wipers may move much slower than usual, or their speed might change unpredictably even on a constant setting. This often indicates a worn-out motor struggling to generate enough force.
• Wipers Only Work on One Speed: If you can only get the wipers to work on the high-speed setting but not low or intermittent, it often points to a failure in the motor's internal resistor or control module.
• Wipers Don't Park Correctly: When you turn the wipers off, they should return to their resting position at the bottom of the windshield. If they stop in the middle of the glass or in a random spot, the motor's park switch mechanism has likely failed.
• Humming or Grinding Noises: A distinct electrical humming or mechanical grinding sound from the base of the windshield when the wipers are turned on is a clear sign the motor is receiving power but is either internally damaged or jammed.
• Wipers Don't Move at All: If the wipers are completely unresponsive, the cause could be a blown fuse, a bad connection, or a completely burned-out motor. Often, you can determine the cause by listening for a humming sound; if there is no sound at all, the problem is likely electrical and upstream of the motor (like a fuse or relay).

Known Issues, Recalls, and TSBs

As of early 2026, there are no specific recalls or widespread Technical Service Bulletins (TSBs) issued by Toyota or the NHTSA for windshield wiper motor failure on the 2021-2025 Toyota Mirai. While the Mirai has been subject to recalls for other issues like software for the stability control and rearview camera systems, the wiper system has proven to be reliable. Any failure is likely due to an isolated part defect or external factors rather than a known design flaw.

Diagnosing the Problem

Before spending money on a new part, follow these steps to confirm the motor is the problem:

1. Check the Fuse: This is the simplest first step. Locate the fuse box and find the fuse related to the windshield wipers. If it's blown, replace it with a new fuse of the same amperage and test the wipers. If the new fuse blows immediately, it indicates a short circuit in the system or a seized motor that is drawing too much current.
2. Listen for the Motor: Turn the ignition on (without starting the car) and activate the wipers. Stand outside near the cowl panel at the base of the windshield and listen. If you hear a humming or clicking sound, the motor is getting power, which means the fuse, relay, and switch are likely working. The problem in this case is a seized motor or a jammed wiper linkage. If you hear nothing, the problem is likely electrical.
3. Test for Power at the Connector: This is the definitive test. You will need a multimeter or a 12V automotive test light. Accessing the motor requires removing the plastic cowl panel at the base of the windshield. Once you can see the motor, unplug its electrical connector. With the ignition on and the wiper switch activated, test the terminals on the harness-side of the connector for 12V power and a proper ground. If you have power and ground at the connector, but the motor doesn't run when plugged in, the motor is faulty and needs to be replaced.
🎬 See this guide on how to test a wiper motor.

Buying a Used Windshield Wiper Motor

For the 2021-2025 Mirai, new aftermarket wiper motors are not yet widely available. This makes a quality used OEM part an excellent value compared to a new dealer part. Here’s what to look for:

• Verify the Part Number: The correct OEM part number for the 2021-2025 Toyota Mirai is 85110-62070. Always match this number to ensure compatibility. The motor is often sold as an assembly with the wiper linkage (transmission).
• Physical Inspection: Carefully inspect the used motor assembly. Look for any signs of heavy corrosion on the motor housing or linkage arms. Check that the electrical connector is clean, with no bent, broken, or corroded pins. Ensure all plastic parts are free of cracks.
• Check the Pivot Points: The wiper linkage has several pivot points where the arms connect. Wiggle these points by hand. There should be smooth movement with minimal play or sloppiness. Excessive looseness can cause jerky wiper motion even with a good motor.
• Source and Mileage: Purchase from a reputable recycler that provides the VIN and mileage of the donor vehicle. A motor from a lower-mileage, newer vehicle is always preferable. A part from a 2023 or newer Mirai is ideal.
• Why Used OEM is a Good Choice: A genuine used Toyota motor is designed for perfect fitment and durability. Unlike potential future aftermarket parts that may use lesser quality materials, a used OEM unit maintains the original factory quality and electrical specifications, which is important for a modern vehicle like the Mirai.

Cost Comparison

Prices can vary by supplier and location, but this gives a general idea of what to expect.

Replacement Overview

Replacing the wiper motor is a moderately difficult job that a skilled DIYer can perform. The main challenge is removing the plastic cowl panel without breaking any clips.

• Difficulty: 3 out of 5
• Estimated Time: 1.5 - 2.5 hours
• Tools Needed: Ratchet and socket set, trim removal tools, flathead screwdriver.

General Steps:

1. Put the wipers into the service position, then disconnect the 12V battery.
2. Remove the plastic caps at the base of the wiper arms and undo the nuts holding the arms to the linkage pivots. Gently rock the arms to remove them.
3. Carefully pry up and remove the plastic cowl panel that sits between the windshield and the hood. This will expose the wiper motor and linkage assembly.
4. Disconnect the electrical connector from the wiper motor.
5. Unbolt the entire motor and linkage assembly from the vehicle's firewall.
6. If your replacement part is just the motor, you will need to unbolt it from the old linkage and transfer it to the new one. Often, it's easier to replace the entire assembly.
7. Installation is the reverse of removal. Before reinstalling the wiper arms, briefly reconnect the battery and run the wipers for one cycle and turn them off. This ensures the motor is in the 'park' position. Then, install the arms in their correct resting position on the lower windshield.

Frequently Asked Questions