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Check wiring under carpet usually under drivers floor. It seems many short circuits are in this area when it controls something in the rear of vehicle. Best to trace wiring from defroster forward.
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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