Skip the auto shop - Our mechanics make house calls

Symptoms of a Bad or Failing Rear Window Defogger Switch

rear window defogger switch

Bad or Failing Rear Window Defogger Switch Inspection

by a top-rated mechanic at your home or office

The rear window defogger switch is located on the front of your vehicle and turns on the defogger on the rear window. This is a safety feature of modern cars that allows the drivers to be able to see out of the rear window in adverse weather. It turns on the wires mounted on the back window of your vehicle, which helps to melt the snow and ice from the window. In addition, it helps to clear the moisture that builds up causing a foggy window and blocks your view. If you believe your rear window defogger switch is going bad, check for the following symptoms:

HAVE SYMPTOMS OF CAR TROUBLE?
Get an $80 diagnostic
by a top-rated mechanic at your home or office.

Get a quote · Book an Appointment · Our expert mechanics come to you.

1. The window will not clear

Once you push the rear window defogger switch, the defogger should turn on and the window should clear in just a few minutes. If the window does not clear, there could be an issue with the defogger switch. The switch powers and completes the circuit of the electrical grid, so if part of the grid does not work, the switch will not work. Contact a professional mechanic to inspect the electrical system in your vehicle and replace the rear window defogger switch as needed.

2. Button will not light up

When you press the window defogger switch, it should light up indicating it has turned on and will go to work once it has heated up. If the light does not illuminate, this could be a fuse issue, a switch issue, or a combination of issues. Since there are several components that make the rear window defogger work, a mechanic should inspect the vehicle’s systems to properly diagnose the problem.

HAVE SYMPTOMS OF CAR TROUBLE?
Get your car fixed at your home or office.

Get a quote · Book an Appointment · Our expert mechanics come to you.

3. Defogger works sometimes

If you notice the rear window defogger works sometimes but not others, this could be a switch issue. The switch has not gone bad yet, so there is still time to get it repaired before it completely fails. The rear window defogger is important because you need to see out the back while driving. If it is not working correctly, this can be a safety issue so you should have it repaired as soon as possible. This type of intermittent issues can be hard to detect. Consult a qualified technician such as one from YourMechanic to assist with diagnosis.

If your rear window will not clear, the rear window defogger button does not light up, or the defogger is not working all of the time, contact a professional mechanic. YourMechanic makes getting repairs to your rear window defogger switch easy by coming to your home or office to diagnose or fix issues.

You can book a service online 24/7. YourMechanic’s qualified technicians are also available for any questions that may arise. The rear window defogger is important because it helps you see while you are driving, so if it is not working properly it is a safety concern.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Still not sure about your car's issue?
Diagnose your car
What kind of issue are you experiencing?
Brakes are squeaking
Car is not starting
Car is overheating
Car is shaking (vibrating)
Fluids are leaking
Heating and A/C
Smoke or steam is coming out of the car
Warning light is on
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
The Traveler’s Guide to Driving in Malaysia
CraigBurrows / Shutterstock.com Malaysia is a popular destination for many tourists today. The country has amazing sights and attractions that you will want to explore....
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...


Related questions

Q: How do you defog the side windows?

While the front and rear defrost will take care of fog or mist on the front and back glass, you’ll notice that sometimes the side windows fog up as well. Here’s how to defog them: Turn the air conditioner...

Q: Window not going up

The window regulator or motor is the most likely cause of the window not going down. If you hear the motor running, but the window does not move, then the regulator is broken. If you do not hear the motor,...

Q: Drivers side rear view mirror defogger not working and how do I repair?

Hello, thank you for writing in. The defroster within the mirror is rather simple. It uses a resistor to collect electrons which ends up resulting in heat. it is this heat that is used to defrost/defog the mirror. If the...