2001 Pontiac Sunfire Rear defrost relay

Electrical problem
2001 Pontiac Sunfire 4 cyl Front Wheel Drive Automatic

Hi,
I'm trying to find out where the rear defrost relay is in my car. The reason is, my rear defrost is not working. I've tested the wires at the grid...no power, the connectors are firmly attached to the grid. I've checked the fuse it is good. When I push the power button on the little yellow light lights up. Is the relay separate from the power button or is it all one unit. Either way I will need to know how to get at part.

Thanks in advance