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Check rear defroster relay in the under hood fuse box . Also Fuse F2 30 amp under hood fuse box . Do your heated mirror's work ? If so relay is good . Defroster relay supply's B+ voltage to both fuse's F2 and F1 ,
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.
rear defrosters are an apllied film of semi metalic strips and if you get you windows tinted often the tint man accidentally nicks these strips cuasing the defroster to malfuction check for breaks in the srips
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