2018 Toyota Mirai Window Won't Go Up Or Down

Troubleshooting Common Issues with Your 2018 Toyota Mirai's Power Windows and How to Fix Them

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Reviewed by
Devin Cabugcal
Written by RepairPal Car Genius
Updated January 14, 2025
0%
36% chance it's the
Fuse, Relay or Electrical System
0%
20% chance it's the
Window Motor
0%
24% chance it's the
Window Regulator
0%
20% chance it's
Something else
The most common reasons a 2018 Toyota Mirai window won't go up or down are window's electrical system such as a fuse or relay, a broken window motor, or a broken window regulator.
  • Fuse, Relay or Electrical System: A blown fuse or a faulty relay can disrupt the electrical circuit, causing components to fail or operate intermittently.
  • Window Motor: A faulty window motor or a broken window regulator can prevent the window from moving up or down properly.
  • Window Regulator: A faulty window regulator can cause the window to become stuck or operate erratically due to worn gears or a broken cable.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a 2018 Toyota Mirai window won't go up or down?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

Like we noted in the last section, general diagnosis symptoms are the most vague of the bunch. There are several diagnostic spectrums, electrical diagnosis, drivability diagnostics, engine diagnostics, transmission diagnostics, and the list could continue for about 5 or 10 more spectrums of diagnostics. The most important take-away here, is that general diagnostics are diagnostics that have no other spectrum in which they fit, or the problem is unknown. This means that any vehicle left outside of a repair facility with the keys and an authorization to perform diagnosis will be diagnosed under the general diagnosis spectrum.

What steps should I take to diagnose the window issue in my 2018 Toyota Mirai?

When diagnosing a window issue in your 2018 Toyota Mirai, it's crucial to follow a structured diagnostic approach that begins with the simplest solutions. Start by checking the window controls to ensure they are functioning properly, testing both the driver's side and individual window controls for any inconsistencies. If the controls appear to be working, the next step is to inspect the fuses related to the windows in the fuse box, as a blown fuse can often lead to window malfunctions. After confirming the fuses are intact, listen for any sounds from the window motor when you press the controls; if the motor is running but the window does not move, this may indicate a problem with the window regulator or motor. Proceed to examine the window regulator for any signs of damage or wear, as a faulty regulator can prevent the window from operating correctly. Additionally, check the window switch for any visible damage, as a malfunctioning switch can also impede window function. Lastly, inspect the window tracks and seals for any debris or obstructions that could hinder movement. By systematically following these steps, you can effectively diagnose the window issue and determine the appropriate course of action to resolve it.

What are the common problems that could cause the window in a 2018 Toyota Mirai to stop functioning?

When addressing the issue of a non-functioning window in a 2018 Toyota Mirai, it's important to recognize the common problems that may be causing the malfunction. A faulty window regulator is often the primary suspect, as it directly controls the window's movement; if it fails, the window may become stuck or unresponsive. Another frequent issue is the power window motor, which powers the regulator; if this motor is defective, the window will not respond to the switch. Additionally, electrical problems such as blown fuses or wiring issues can disrupt the window's operation, making it essential to inspect the vehicle's electrical system. A malfunctioning window switch can also hinder the window's functionality, so testing this component is a wise step. Lastly, if the window has come off its track, it may not operate smoothly or could become completely stuck. By understanding these common problems, you can more effectively diagnose the issue, whether you decide to attempt the repair yourself or consult a professional mechanic.

How urgent is it to fix the malfunctioning window on a 2018 Toyota Mirai?

When it comes to fixing a malfunctioning window on a 2018 Toyota Mirai, the urgency cannot be overstated. A window that fails to close properly not only compromises the safety of the vehicle's occupants but also exposes the interior to harsh weather conditions, which can lead to costly damage over time. Additionally, an open window increases the risk of theft, making your vehicle an easy target for opportunistic criminals. Beyond personal safety and security, there are legal considerations to keep in mind; in many jurisdictions, driving with a malfunctioning window can result in fines or penalties. Therefore, addressing this issue promptly is crucial not just for the immediate comfort and safety of passengers, but also for the long-term integrity of the vehicle and compliance with local laws. For DIY enthusiasts, understanding these factors can help prioritize repairs and ensure a safer driving experience.

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