How to defrost side mirrors on Subaru Outback?

Turn on the rear window defroster. In most Subaru Outback models, heated side mirrors engage automatically when the rear defroster is active; if your trim has a separate mirror-heater switch, enable that too. For stubborn frost, you can use a de-icer spray or a warm cloth to finish the job safely.

Understanding how the mirror defrost works

Knowing how the system is wired helps you know what to expect across model years. On many Outbacks, the mirrors are heated and wired to respond to the rear window defroster. Some trims may also offer a dedicated mirror heater switch, typically located near the climate controls or on the door panel. If your vehicle lacks a separate switch, rely on the rear defroster to heat the mirrors.

Using the car’s built-in defrost features

Before you use the list below, note that the quickest way to clear frost from the mirrors is to activate the car’s defrost systems. The steps describe the standard method most Outbacks use.

• Start the engine and switch on the rear window defroster (the control is on the center console). The heated mirrors often activate automatically once the rear defroster is on.


• If your model includes a separate mirror heater switch, turn it on. This switch is sometimes located near the climate controls or on the mirror housing, depending on the year and trim.


• Give the system a minute or two to warm the mirror surfaces. Fog or frost typically clears as the heating elements reach operating temperature.


• After the frost clears, wipe the mirrors with a clean microfiber cloth if needed to remove residual moisture or ice flakes without scratching the glass.

Using the built‑in defrost features is the simplest and fastest way to clear your Outback’s side mirrors. If the mirrors don’t clear after a short wait, proceed to manual defogging methods described below.

Manual defogging and de-icing options

When built‑in heating isn’t available or isn’t effective enough on particularly cold mornings, you can rely on manual methods. Use these carefully to avoid damaging the mirror surfaces.

• Apply a dedicated automotive de-icer to the mirror surface according to the product instructions, then wipe with a clean microfiber cloth.


• Gently wipe the mirror with a soft, lint-free cloth from top to bottom to remove moisture as it clears. Avoid pressing hard or using sharp tools that could scratch or crack the glass.


• Do not pour hot water or place the mirror in boiling conditions; drastic temperature changes can crack the glass or damage the heater elements.


• If frost is stubborn around the edges, use a plastic scraper designed for glass or ice specifically; never use metal blades on the mirror surface.

Manual methods can be effective, but they require extra care to protect the mirror and its wiring. Use these as a backup when the built‑in heaters aren’t doing the job quickly enough.

Troubleshooting if the mirrors won’t defrost

If your Outback’s mirrors won’t defrost despite following the steps above, try these checks before visiting a service center.

• Confirm the rear window defroster is functioning. If the rear window doesn’t clear, the mirror heating system may not be receiving power or may share a fuse.


• Check the vehicle’s fuses for the rear defroster and any mirror-heater circuits. A blown fuse can disable the mirror heaters even if other defroster functions work.


• Inspect connections at the mirror housing and under the dash (if you’re comfortable doing so). Loose wiring or a damaged connector can prevent heating from activating.


• If there’s no known upgrade or aftermarket modification, contact a Subaru dealership or qualified mechanic for a diagnostic. A faulty mirror heater element or control module may require replacement.

If the mirrors still won’t defrost after these checks, professional service is recommended. A dealer can confirm whether the issue lies with the heater element, wiring, or the control circuit.

Summary

Most Subaru Outback models rely on the rear window defroster to power the heated side mirrors, with a possible separate mirror heater switch on some trims. Start the engine, enable the rear defroster (and the mirror heater if available), and wait a minute or two for defrosting. If needed, use automotive de-icer or a microfiber cloth for manual finishing, while avoiding hot water or sharp tools. For persistent issues, check fuses and wiring and consult a Subaru technician if necessary.

How do I know if my Subaru has heated mirrors?

A small light mounted in the mirror will often illuminate, letting you know the heater is on. The mirrors typically employ a timer, shutting off automatically after being on for a few minutes. You can tell if your vehicle has them by looking at your vehicle's mirror.

How to stop side mirrors from freezing?

To stop side mirrors from freezing, cover them with plastic bags and rubber bands overnight, use specialized car mirror covers, or apply a hydrophobic coating or spray. If they are already frozen, use a hairdryer or de-icer spray to thaw them, avoiding forceful methods like scraping.
 
This video demonstrates how to prevent your side mirrors from freezing in winter: 59sBRIGHT SIDEYouTube · Nov 11, 2018
Preventative measures

• Cover the mirrors: Before it freezes, put plastic bags over your side mirrors and secure them with rubber bands or clothespins to prevent ice from forming directly on the glass. 
• Use mirror covers: Purchase a dedicated car mirror cover that is designed to protect against snow and ice. 
• Apply a coating: Wipe a hydrophobic or de-icing spray onto the mirror glass. These products repel water and can prevent ice from forming. Some car waxes can also be applied to headlights and mirrors to prevent snow buildup, this YouTube video explains. 

This video shows several winter car hacks, including using socks on wipers and bags on side mirrors: 58sCBC NewsYouTube · Dec 3, 2018
What to do if mirrors are already frozen

• Use a hairdryer or heat gun: Gently heat the mirror's base to thaw the mechanism. This YouTube video shows this method in detail, highlighting that a hairdryer is safer for paint than a heat gun. 
• Spray with de-icer: Apply a de-icing spray or a mix of water and rubbing alcohol to melt the ice on the mirror's surface. 
• Avoid force: Do not use a scraper or force the mirror to unfold, as this can damage the plastic parts or the mechanism itself. 

You can watch this video to learn how to fix a frozen power-fold mirror using a heat gun: 47sSteve's GarageYouTube · Jan 16, 2024

How do side mirrors defrost?

Side mirrors defrost via a heating element that is activated by a button, usually the one for the rear window defroster. The element, which looks like a grid of lines on the mirror, warms the glass to melt ice and fog. Some vehicles may also have a separate switch or activate the feature automatically based on temperature.
 
How to activate side mirror defrost

• Find the correct button: Look for the button that activates the rear window defogger. This often has an icon of a rectangle with wavy lines inside it. On some models, turning the side mirror adjustment dial all the way to the side with the heated mirror icon will turn it on. 
• Turn it on: Press the button to activate the system. You should see a light on the button or in the mirror itself, indicating the heater is on. 
• Wait for the ice to melt: The mirrors will start to defrost. The time it takes depends on the outside temperature and your vehicle. 
• Turn it off when done: Once the mirror is clear, it is a good idea to turn the system off to conserve power, as some systems may not have an automatic shutoff timer. 

If you don't have heated mirrors

• Use plastic bags: Cover the mirrors with plastic bags and secure them with a rubber band to prevent ice from forming overnight. 
• Make a de-icing spray: Mix two parts isopropyl alcohol with one part water to make a solution that melts ice. 
• Use a defroster: Use a plastic ice scraper, or spray your side mirrors with a de-icing spray or solution to help melt the ice. Remember to be careful not to scratch the glass. 

This video demonstrates how to turn on heated mirrors and shows how they work: 1mSteven WelchYouTube · Apr 14, 2024

How to turn on side mirror defrost subaru outback?

E Defroster button/ Rear window defogger button 1 Defroster button: Press the button to defrost the windshield. 1 2 Rear window defogger button: Press the button to turn on rear window defogger, outside mirror defogger and windshield wiper deicer (if equipped).