Q: How do I know if the rear defrost module is bad?
Rear defrost doesn't work but the light does come on
My car has 11300 miles.
My car has an automatic transmission.
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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.
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