Usually, the heating of the seats in the Hyundai Tucson cabin is caused by a rupture of the electric circuit, the damage to the thermoelectric fuse or the heating element itself, and the indicator on the heating indicator on the button operates in any case.
The chain break can be determined independently by measuring the voltage (12V) on the appropriate slot under the seat of the tester. Don't forget to turn on the warm-up button. If the transaction is in order, you must remove the cover to "permit" the fuse or heating element.