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You probably have a broken connection at the back window. First look at the connections on the glass. The wires on the glass lead to a plug. See if it is unplugged or if the connection has been torn off the glass. There may be two plug's. If they appear to be ok then check the wires on the glass. They are glued on the glass surface and if something has scratched them or cut the connection at some point it's just like cutting a wire.

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Q: What happens when my rear defrost in my car does not work but the light at the dash is on?
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