Why does the seat heater warm the lower back but not the buttocks?

[VanMiguel]

It is most likely due to damage to the heating wire in the heating zone. The principle of seat heating is similar to that of an electric blanket—if the heating wire is damaged, it cannot generate heat. How seat heating works: The working principle of seat heating involves resistance heating wires stitched into the seat cover. By supplying electricity to these heating wires, heat is generated, allowing the car seat to reach the set temperature within a short time. The heating temperature of the seat remains within a comfortable range. Low cost of seat heating: Seat heating is more commonly equipped than seat ventilation because its working principle is simpler, resulting in lower manufacturing costs compared to seat ventilation.