Question about 1998 Chevrolet Cavalier

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Rear window defrost is'nt working.

There is power going to the two leads that plug into each side of the window but when they are all hooked up and i put the tester on the leads there is no power again. There is conintunity through the window leads.Can you help me please.

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  • ballen1938 Nov 30, 2008




    98 cavalier no power to rear defroster. Light on dash comes on still no power to back window. checked fuse ok is thera a relay some were. THANKS


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Look closely to see if any of the wires are broken on the grid on the glass

Posted on Nov 30, 2008

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My rear defroster stopped working. I press the rear defroster and i hear a click coming from the fuse area but the light does not turn on nor does the rear defroster work. Checked the fuse but the fuse...


Check to see that the wires that connect to the rear window are indeed intact...then you will need to look at the lines in the window to be sure none of then are broken...to go further, you will need a voltmeter...hook up the voltmeter across the two leads that connect to the window and turn on the system to see if it delivers 12 volts to the window...if so then the connections are either bad or the wires inside the glass are open

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When I turn on the rear defrost the light comes on but the window does not defrost. I had the rear windshield replaced at 26000 miles because when I would turn on the rear defrost my radio stations would...


check the connections going in to the window leads and also with a test light ,check if their is power at the terminals that plug into the window leads. does your car still have factory warranty that the dealer can look into this.

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There is a connector going to rear defrost on the rear window. Disconnect this and check for voltage with defrost on. If this is good, check resistance for the connection to window. This will tell you if the electrical is working or the element is bad for the window if there is a open reading on multimeter.

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Rear defrost won't workon cavalier


The Cavalier suffers from the infamous Purple wire problem. when you have this problem, the light comes on and timer works but there is no power at the rear elements. Cause is in the connector on driver's side, behind the carpet near hood release. Pull this carpet down and locate the Purple wire going into a green plug...press center of plug to open. Likely the contact is blackened inside, that is cause of the problem. You have two choices...clean the contacts and put plug together and defogger will work, for a while. I took the Purple wire out of the plug and soldered it to the black wire on the other side of the plug...make sure you get the right two wires. Look at the plug. The plug causes a high resistance contact and no voltage gets to rear. To prove it, disconnect one terminal at the window and measure 12Volts, connect the wire and the voltage disappears. Basic Ohm's Law. The plug contact is getting all the voltage. Don't let anyone tell you that you need a new switch, if the light/timer work. That won't fix it.

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if the leads on the window themself are broken(small gaps in the lines going across the window) you can get a special pen to connect the lines again , but if there is no power going to the defroster and the fuse is ok, then you have to fix the wire going to the defroster

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Rear window defrost not working


If you have a good fuse, you hear the defrost relay clicking then I would say ....

If you can use a multimeter you can look for power at the back window.

If you have power but arent getting any heat you can then use the multimeter on continuity check to track down the break in the rear window heating grid. *(some cars put the grid between two pieces of glass or use coatings on the exterior...if yours is one of these the test I described will not work).

You put the tester on continuity and touch the leads together and see if you hear a beep sound. That's good continuity. Now turn off the defroster at the switch. Putting one lead on one of the window power contacts you can then use the other lead to see how far the grid has continuity. When you find no continuity, you have located the break!
Be patient, there could be more than one break.

There are places to shop online where you can buy the conductive paint to patch the break in your window grid.

Good luck and be careful.

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I have a 2002 Corolla GS. Rear window defroster not working


The main cause for the rear window not working is a disconnected wire at either side of the defroster grid. You can see where the body harness connects to the rear glass.

The second most liekly cause are broken defroster grid wires.

I would suggest to you to obtain a 12 volt DC testlamp, and check for voltage as follows, at the rear defroster.

Hook the clamp of the testlamp up to a known good ground. The back door latch 'hoop' is great. Next, turn on the rear defroster, and place the point of the tip on the extreme side of the back window, on the grid. Does it the tester light up bright? If not, try the other side.

The light, moving across the grid, should get noticeably dimmer, if the grid is functioning properly. The light will go out when you encounter a broken grid wire..

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Rear side windows


This may be just a case of inadvertently hitting the window lock out n th driver door window switch by mistake. Check that first. Here's some background on window operation

Principles of Operation
The driver power window regulator motor is controlled directly by the master window/door lock/unlock switch (and its integrated "auto down" module). Power is supplied to the power window relay and the master window/door lock/unlock switch, and the passenger power window switch when the SEC/timer module grounds the coil side of the power window relay. The SEC/timer module will ground this relay when the ignition is in the ON position and will remain energized for approximately 15 minutes or until the driver or passenger door is opened.
The driver power window regulator motor is a reversible motor that is operated by applying power and ground to the motor leads to lower the window, and then reversing polarity on those leads to raise the window.
The passenger power window regulator motor is controlled directly by the passenger power window switch and can also be controlled by the master window/door lock/unlock switch. Power is supplied to the power window relay and the master window/door lock/unlock switch, and the passenger power window switch when the SEC/timer module grounds the coil side of the power window relay. The SEC/timer module will ground this relay when the ignition is in the ON position and will remain energized for approximately 15 minutes or until the driver or passenger door is opened.
The passenger power window regulator motor is a reversible motor, which is operated by applying power and ground to the motor leads to lower the window, and then reversing polarity on those leads to raise the window.
The power rear quarter glass is also directly controlled by the master window/door lock/unlock switch. The power rear quarter glass power latches also utilize reversible motors. The power rear quarter glass power latches are operated by applying power and ground to the motor leads to open the window, and then reversing polarity on those same leads to close the window.
Symptom Chart Condition Possible Sources Action
  • All windows are inoperative
  • BJB Fuse:
    • F20.
  • Circuit.
  • Power window relay.
  • Front door power window switch.
  • GO to Pinpoint Test A .
  • Single power window is inoperative
  • Front door power window switch.
  • Front door power window regulator.
  • Circuit.
  • Driver door power window switch.
  • GO to Pinpoint Test B .
  • Vent power window is inoperative — quarter window glass power latch
  • Circuit.
  • Quarter window glass switch.
  • Quarter window glass power latch.
  • GO to Pinpoint Test C .
  • The one touch down feature is inoperative
  • Master window regulator and door lock switch.
  • INSTALL a new master window/door lock/unlock switch. REFER to Switch—Master Window Door Lock/Unlock .
  • The back window will not defrost
  • CJB Fuses:
    • F30 (10A).
    • F32 (20A).
    • F34 (20A).
  • BJB Fuse:
    • F27 (45A)
  • Circuit.
  • Heated back window switch.
  • SEC/timer module.
  • Rear window defrost relay.
  • GO to Pinpoint Test D .
  • The back window defrost will not shut off automatically
  • SEC/timer module.
  • Circuit.
  • Rear window defrost relay.
  • GO to Pinpoint Test E .

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