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  2. sku: 19663772318800741
  3. SCION 8404021021

SCION 8404021021 Power Window Master Switch Door MM79 043

fits model: Tc. make: Scion. year: 2005–2010.

8404021021 Scion 2005-2010 Tc Power Window Master Switch Door Button Mm79#043

( Manufacturer Part Number: 8404021021 ), ( To Control: Window ), ( Type: Push Button ), ( Manufacturer Warranty: Lifetime ), ( Oe/oem Part Number: Window Switch, 84040-21021 ), ( Fitment Type: Direct Replacement ), ( Features: Durable ), ( Placement On Vehicle: Driver Door )

Review SCION Power Window Master Switch Door Buttonmm 79#043 fits TC 2005–2010

The Scion TC Power Window Master Switch Door MM79-043, part number 8404021021, is an essential component for the power window system in select Scion TC models produced between 2005 and 2010. This master switch allows drivers to control all their power windows with the convenience of a single switch.

This switch is designed to be mounted on the driver's side door and features a sleek, modern design that blends seamlessly with the interior of your vehicle. It is built to last with high-quality materials and a robust construction that can withstand the wear and tear of everyday use.

The master switch operates by sending electrical signals to each window motor to raise or lower the window as desired. It also includes a built-in auto-reverse function for safety, which automatically reverses the direction of the window if it encounters an obstruction.

This Scion TC Power Window Master Switch Door MM79-043 is a direct replacement part, meaning it is engineered to fit and function exactly like the original equipment manufactured by the vehicle's manufacturer. It comes with all necessary hardware for installation and is backed by a warranty for added peace of mind.

If you're experiencing issues with your power windows not working properly or if you're looking to upgrade the functionality of your Scion TC, this master switch is an excellent investment. It is easy to install and will restore the convenience and functionality of your power windows in no time. So, don't hesitate to order this Scion TC Power Window Master Switch Door MM79-043 today and enjoy the benefits of a seamless and hassle-free driving experience.

Pros and Cons of Buying a Scion TC Power Window Master Switch (MM79 043) for 2005-2010 Models

Introduction:

The Scion TC power window master switch (MM79 043) is a crucial component for the power window system in the Scion TC vehicles manufactured between 2005 and 2010. If your vehicle's power windows are not functioning correctly or not working at all, replacing the master switch may be an effective solution. In this article, we will discuss the pros and cons of buying this part to help you make an informed decision.

Pros:

1. Functional: A faulty master switch can prevent the power windows from operating, leaving you stranded in the rain or sun. By replacing the faulty switch with a new one, you can restore the functionality of your power windows.

2. Cost-effective: Compared to other repair options, such as replacing the entire power window system, buying a new master switch is a more cost-effective solution.

3. Easy installation: The power window master switch is a relatively simple component to install, making it a DIY-friendly project for those who prefer to work on their vehicles themselves.

4. OEM quality: The Scion TC power window master switch is an original equipment manufacturer (OEM) part, ensuring that it is designed to fit and function optimally in your vehicle.

Cons:

1. Cost: While the master switch may be a cost-effective solution compared to other repair options, it still requires an investment. The price of the part may vary depending on the supplier and the availability of discounts or promotions.

2. Availability: The Scion TC is no longer in production, and parts availability may be limited. You may need to check with multiple suppliers to find a reliable source for the master switch.

3. DIY installation challenges: While the installation process is generally straightforward, some challenges may arise, such as accessing the switch or dealing with wiring connections.

4. Potential for additional repairs: A faulty master switch may be a symptom of a larger issue, such as a wiring problem or a malfunctioning window regulator. Replacing the master switch alone may not resolve the issue, and additional repairs may be required.

Conclusion:

In conclusion, the Scion TC power window master switch (MM79 043) offers several benefits, including restoring functionality to your power windows, cost-effectiveness, ease of installation, and OEM quality. However, it also comes with some drawbacks, such as cost, limited availability, potential installation challenges, and the possibility of additional repairs. Ultimately, the decision to buy this part depends on your personal circumstances, including the urgency of the repair, your budget, and your willingness to perform the installation yourself.

Recommendation:

If your Scion TC's power windows are not functioning correctly, and you've determined that the master switch is the culprit, it may be worth considering purchasing a new Scion TC power window master switch (MM79 043). Be sure to research potential suppliers, compare prices, and consider any potential installation challenges before making your purchase. If you're unsure about the installation process or the availability of the part, it may be worth consulting a professional mechanic for advice.

Details:

NOTE: STOCK NUMBER:mm 79#043 USED OEM POWER WINDOW SWITCH.

part #: 8404021021 prices

  • $51.03-$55.00

specifications inswico:

  • for models: Tc
  • for makes: Scion
  • for years: 2005-2010
  • mpn: 8404021021
  • to control: Window
  • type: Push Button
  • manufacturer warranty: Lifetime
  • oe/oem part number: Window Switch, 84040-21021
  • fitment type: Direct Replacement
  • features: Durable
  • placement on vehicle: Driver Door

offer inswico:

  • sold: 0
  • started: December 4, 2025
  • availability: In Stock
  • best offers: True
  • quantity: 1
  • options: Ship-to-home

general inswico:

  • condition: Used
  • Car Truck Parts Accessories > Interior Parts Accessories > Switches Controls

payments inswico:

  • credit card: Discover
  • other
  • wallet: Google-pay

returns inswico:

  • policy: Returns Accepted
  • time: 30 Days
  • paid by: Buyer

shipping inswico:

  • class: Standard
  • transit: 4-9 Days
  • type: Fixed
  • cost: $0.00
  • service: USPS Ground Advantage
  • carrier: USPS

seller inswico:

  • rating: 99.3%
  • city: Casselberry, Florida
  • # reviews: 14951
for models: tc, for makes: scion, for years: 2005-2010, to control: window, type: push button, manufacturer warranty: lifetime, oe/oem part number: window switch, 84040-21021, fitment type: direct replacement, features: durable, placement on vehicle: driver door,
category: auto parts > car truck parts accessories > interior parts accessories > switches controls, sku: 19663772318800741,
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