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I would start at the source of power for the heated seat. You should be able to trace the wires from the switch to wherever the installer tapped power from. It could have simply blown a fuse in the cars fusebox, or maybe a wire came loose. If you can measure voltage from the source, inspect the wiring to the switch for damage. If everything appears good to the switch, check for fuses in the switch or inline with the wiring of the seat heater. It's possible the switch is broken. You could jump the switch to bypass it, and see if the seat heats up.
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