Q: Why isn't my rear defrost switch working.

asked by on

My rear defrost switch does not work.I push it and the light doesn't come on and the rear defrost doesn't come on either.I've checked fuses and relays but and even tried a different heat/ac control module and it doesn't light up or work on that one either.I am lost on what to check next.
My car has an automatic transmission.

Hi there. The most common issue with a rear defroster is physical damage to the heating grid running through the rear window. Damage can be caused by objects rubbing across the glass, which can break some of the grid wires. If the grid is damaged, it opens the circuit. The defroster will not function from the point of the break forward. This will disable the switch and render the system faulty. The best way to diagnose this issue correctly however, is to have a professional mobile mechanic complete a defroster is not working inspection.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Why isn't my rear defrost switch working.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Bad sludge build up in engine, scheduled for oil change on 10/28.

Hello there, the oil light can come on with your 2009 Hyundai Sante Fe for many different reasons. When an oil light is seen, the vehicle should be inspected immediately as running the engine low on oil can cause lasting...

Q: .Airbag light stays on and I never had an accident.

Hi there. First you should get a code reader and check the engine codes to see what the airbag light is on for. This will point you in the right direction for a diagnostic procedure. Most of the time the...

Q: Headlight bulb locations on my car.

Hi there. There could be bulbs for fog or daytime driving. If you start the vehicle during the day and two of the bulbs come on with no switch on, then they are daytime running lights. If the lights do...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...