1993 Explorer, Rear defroster doesn't work

Tiny
BHUGG
  • MEMBER
  • 1993 ALL OTHER MAKES ALL OTHER MODELS
My 1993 Explorer rear defroster stopped working. I can't determine if there is voltage to the switch, however, when you try to start the defroster, you can hear the relay click in, but there is no indicator lamp or defrosting. I can't find any bad fuses or an indication of which fuse it is.
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Friday, February 9th, 2007 AT 10:40 PM

4 Replies

Tiny
RASMATAZ
  • MEMBER
Get a test light disconnect the connector from the rear defroster and look for power-
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Saturday, February 10th, 2007 AT 12:28 AM
Tiny
BHUGG
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There is no DC voltage to the rear defroster when the switch is pressed. I tried this from both window connections to ground and across each other. The resistance accross the defroster is 1 ohm. However, as I mentioned, you can hear the relay clicking in inside the switch. And yes, I did check my meter against a good power source


http://www.2carpros.com/forum/automotive_pictures/58526_cropped_rear_defroster_switch_2.jpg



Update
I took the switch apart and it is the attached photo.
I can energize the relay and see it operate. However, there is no voltage to the relay contacts. there is also no power at the rear defroster when enegerized.

There is no mention of a fuse in any of the auto store books I have nor is there a fuse mentioned in the owners manual. I have checked all the fuses I could find.

Does anyone know which fuse it is?

Could this be an issue with the ignition switch?
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Saturday, February 10th, 2007 AT 11:00 AM
Tiny
RASMATAZ
  • MEMBER
If you can hear the relay cliick-now the question is it coming out of the relay to the rear defroster grid.

Do you have power to the relay connector when key is On and switch energized.

You need an EWD to know what's in between the relay and the switch and therfore.
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Saturday, February 10th, 2007 AT 3:42 PM
Tiny
BHUGG
  • MEMBER
I ordered a wiring diagram for the car and found that, as I suspected, there was another fuse involved. The control has a seperate power source from the actual circuit that heats the window. The power for the actual heater comes from the fuse box under the hood. I had checked all the fuses and all were good. However, aparently, in an pervious time when I checked the fuses there, I put the 40a fuse for the rear window defroster in the power assist shift slot by mistake (which calls for a 20a fuse). I don't have power assist shifting, so I pulled the 40a fuse and put it in the "HTD BLITE" slot. It now works.
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Friday, February 16th, 2007 AT 9:54 AM

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