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Rear defrost does not work

This is a discussion on Rear defrost does not work within the General Help forums, part of the LSx Technical Help Section category; PM sent....

  1. #41
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    Black & Blue
    '02 WS.6 / '07 Suburban

    PM sent.

  2. #42
    Senior Member kool-aide's Avatar
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    so it seems like even one break in the rear element can cause the whole thing to fail. Would this be an accurate statement?

  3. #43
    Senior Member kool-aide's Avatar
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    well after reading the list of trouble shooting steps.

    it states if you are getting voltage at the connect but no defrost and switch light.

    you have a bad switch, .

    this means i have a bad switch and a second u-pull it switch that is bad.

    guess i will be saving the big bucks for a brand new switch.

    I get voltage in each step of the trouble shoot. bummer, well that's what you get for gambling on used parts, .

    you have to know when to hold em, know when to fold em, know when to walk away, lol...


    thank you pajeff02, that PM was just what i needed.

  4. #44
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    Quote Originally Posted by kool-aide View Post
    well after reading the list of trouble shooting steps.

    it states if you are getting voltage at the connect but no defrost and switch light.

    you have a bad switch, .

    this means i have a bad switch and a second u-pull it switch that is bad.

    guess i will be saving the big bucks for a brand new switch.

    I get voltage in each step of the trouble shoot. bummer, well that's what you get for gambling on used parts, .

    you have to know when to hold em, know when to fold em, know when to walk away, lol...


    thank you pajeff02, that PM was just what i needed.

    No problem -- glad I could help out. Now that you have a diagram and know what the wires are, try a jumper and see if it activates your defroster. You can also unplug and probe the back of the switch with a continuity tester to see what you get. I hate to see you invest in another switch.

  5. #45
    Senior Member kool-aide's Avatar
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    I guess I could check 0 Ohms vs some Ohms for continuity. I don't think any of my meters tone for continuity like some of the fancy ones, such as a Fluke. Oh I wish I could afford a Fluke.

    It looks like you would jumper Brown and Purple. The would be the ignition voltage to the rear defrost wiring. Hey, I could just drive with my defrost on 100%, lol.... Believe it or not I use mine to help warm up the morning dew down here. people think you don't need one in the south, but I find it can help with early morning dew.

    At least if I jumper it I should get my 12V at the rear hatch connections.

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