The defroster is a thin filament that is run across the rear window sometimes inside that heats up to remove frost. first off does the switch light up when pressed? is there power to the connector at the back window? if so then check the filament itself for breaks this may be the problem, if not then it may be a blown fuse, or bad connection.
There is a repair kit available to repair the grid. A test light will find the break in the grid.
The 2004 Oldsmobile Alero fuse box can be found in the engine compartment. The location of the rear defroster fuse will be listed on the inside cover of the fuse box.
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