If the blower motor is malfunctioning the defroster will not work.
Car back window heater not working.
If the exterior frost layer is thin your windshield.
How to defrost a car window without a heater step 1.
Disconnect both wires from either side of the defroster grid and touch one end of your tester to each wire.
If this happens to be the case you can use a soldering gun to reattach them.
If it has replace it and test the heater again.
Jumping the car or replacing the battery can solve this problem.
But the defroster became standard issue for rear windows and the world was a better place.
If the light comes on you have power.
Make sure the rear defroster switch and the ignition key are turned on.
Wipe up interior moisture and water droplets with.
That is until something put a little nick or scratch in one of those delicate lines across the glass.
The battery could be the problem if you find that other aspects of the car are not working in addition to the defroster.
However turn on the rear wiper and everything works as long as the wiper is not in the home position.
Heater windows radio wipers all work in the acc key position.
If the new fuse.
Turn your windshield wipers on when you get in the car.
It was widely accepted in the car business that a car more than 5 years old would likely have an inoperative rear.
Clip the lamp.
There is a chance that you are missing terminal edges on your window heat grid.
As it goes back and forth across the window everything comes on and shuts off.
Trace the current path from the fuse to the switch to the timer and on back to the window.
Remember the timer will turn off the current within 5 to 10 minutes so you ll need to keep track of the timer s time window or you ll be looking for current that s not supposed to be there.
Examine the fuse to see if it has blown.
Repairing heater element with conductive paint.
Use an ice scraper to scrape the windows both inside and out.
Then the system stopped working.
Issues can range from a blown fuse to a bad blower speed controller.
Start the car and it all shuts off.