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Most GM cars and trucks use the fuse panel for safety with the rear defroster...Check your owners manual for the location of the fuse block...I think it is inside your glove box...Try the fuse first...if not the fuse...your options include replacing the glass inserted strips...(do not remove) with a rear shelf defroster blower motor... or an add on rear window defroster...Your auto parts stores should have both...Hope this helps.
Can't supply a diagram, but the circuit works as follows: Power for the defrost grid is obtained through 30A fuse 22 in the battery junction box (BJB) and is applied to terminal 30 of the rear window defrost relay. Power for the relay is obtained through 5A fuse 22 in the CJB and applied to terminal 2 of the rear window defrost switch. When the switch is operated, power is applied to the coil of the rear window defrost relay, causing contact closure and heating of the grid. There is no timeout circuit shown so apparently power is applied to the grid whenever the car is running.
Check the fuse it should be labeled in the fuse panel as rear def. If its blown replace it and if that doesnt fix it or if the fuse blows again then u have an electrical problem and will need to have a technician look at it.