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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.
check to see if power is coming out off switch to back window. if not switch is bad. try this if need be to find out if wire is broke. run a wire to back window from output on switch, touch or put it on defroster lug at back window. if it works then the main wire is bad, make sure all fuses and relays are ok. heres an eaiser way !! remove switch, jump from positive wire to wire going to back window. thats if wire is ok, to back window.
It could be a bad rear defroster control switch or relay, it could be a loose or damaged connector somewhere in the defroster circuit, or it could be a damaged or defective defroster grid on your rear window. The easiest way to check to see if you have a circuit problem or a grid problem is to check for voltage at the connectors to the defroster grid at the rear window area. These connectors may even be located inside the trunk just below the rear window. If there is power there, then the circuits are OK and the rear window will most likely have to be replaced to fix it. If there is no power there, then the circuits must be traced to locate the cause of the failure...Most likely a burned-up switch and/or connector.
first of all see if there is any power from switch to rear window. if there is power to rear window, then the heater grid may be bad. if no power from switch, first check the fuse for rear window defroster. if fuse is ok, then replace switch, if no ower is going out of it.
just a guess but being that the rear defrost is not woking id bet ist a fuse check owners manuel or go to a local autozone or the like store as thy should check this for free hope this is helpfull.
please post response good luck
Regarding the repair of the rear window defroster. There is a "electric ACD module" on the inside rear driver side roof sail that connects to the rear defroster and antenna. I had the same problem and found the connector for the defroster had overheated and melted resulting in a failed connection. The NAPA part numbers for the module and replacement connector are 25623688 and 15305949.