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if you already checked the fuses and found them to be good then you may now want to check the connectors under the seat. You will need a probe light to so this. The probe light will light up if you have power coming into the (+) terminal end. Watch this video to learn how to use a probe light tester. https://www.youtube.com/watch?v=Y0HjaR0tj7Q
If your fuses are good, perhaps your heated seat switch is faulty. You can test the switch for connectivity using a meter to see if power is going through the switch when in the ON position. If the meter shows no power while in the ON position, replace the switch. If power is reaching the seat, then likely the heating element itself within the seat is the culprit.
First check the fuse(s). Make sure you look carefully in the owner's manual, as some of those random items have multiple fuses and share fuses w/ other components... so make sure you check all applicable fuses.
If the fuses are all good, then you'll probably have to replace either the switch(es) or the motor... the major problem being that you usually cannot return electrical parts that are not actually defective, so trying one and then the other could be more expensive than just taking it to a shop and saying "doesn't work, fix it". Ditto for if it turns out to be an electrical wiring problem/short.
If you have an Owners manual, try looking for a fuse panel diagram. Your could have a bad connection inside the doorpanel which shorted the fuse. The seat drive motor must be wired to a separate circuit coming from the floorboard and its okay.
The circuits are wired independently to protect the lighter wires from the heavy drain of the seat motor. If you had the heated seat function working on the seat at the same time as adjusting the seat motor it would be too much for a single circuit, so they gave you two circuits.
If you are going to work on the door panel, disconnct the NEG battery cable so you won't short out something taking it apart.
Another Repair place you might try is a Glass Replacement shop. They install the inner workings of window tracks daily and remove the door panels to do it. They would be able to find your wires, test your window motor, and get you on your way quickly.
Unlike a Dealership, they have a high turnover of glass installations daily. Some even come to your house to repair your problem. Your car would be repaired more quickly with these services.