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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.
Check your fuses first. Then check to see if you have power to the box under seat. It should be about 3x3 and black I think. If you have power to the box change the box. To check use a test light. make sure the key is on and the button is pushed then probe the wires going to the box. Hope this helps you.
The most likely failure point is the driver heated seat elements. They probably have excessive resistance and once they warm up a little they short out the module and it defaults to not working. I would recommend replacing both upper and lower driver seat elements.