Skip the auto shop - Our mechanics make house calls

Q: How do I know if the rear defrost module is bad?

asked by on

Rear defrost doesn't work but the light does come on

My car has 11300 miles.
My car has an automatic transmission.

Hi there. If you checked the fuse, defroster switch, main power tabs and the wiring but the defroster still does not work, then It is time to take a look at the relay. The defroster relay is normally located under the dash. Some installations combine the timer and relay in one unit. Jump the relay defroster wires with a jumper wire and if the defroster works then the problem is the relay. Remove the unit and replace it with a new one. If you need further assistance with diagnosing the rear defroster, then seek out a professional, such as one from Your Mechanic, to help you.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
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. How do I know if the rear defrost module is bad?

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: Fuel spitting out of the injector

You will need to check to see if the ignition timing for the distributor is set to top dead center and check for spark at the spark plugs. The ignition distributor rotor inside cap shorts and will cause no start....

Q: Warped rotars

Hello. I will be glad to help you with your question. There is no failure mode of the ESC system that would cause, or lead to, warped rotors. The only explanations for a problem of that sort is continuous, or...

Q: Glass shattered all on its own

The rear window with defrost grid on your Ford Focus is made of tempered glass. Tempered glass is designed to break into little pieces when it shatters to help prevent large pieces from possibly hurting someone. The temper process is...

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...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.