Using a test light, connect clip to one of the leads of the grid and probe the other. If it lights, the grid is open. If it doesn't, there is a power or ground open going to the grid. If it doesn't, clip to a good ground and check each wire at the grid. If the light lights, the ground circuit is open. If it doesn't, the power circuit is open. If power is open, check appropriate fuses, etc.
SOURCE: BMW 316i E36 1994, Rear window demister isn't
Check rear demister control relay operation,
Check for presence of 12V power (and ground connection) at rear window heater connection.
Check continuity of the rear window heating element.
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