Passenger seat heater won't heat on 2005 Lincoln Navigator

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
The passenger seat heater quit working. Any idea about what is causing it?
(1) Answer
These devices can be a bit complicated. There will be fuses and potentially a control module involved. Have you recently spilled a beverage on the seat?

Unless you are comfortable working on the car yourself, you'll likely need some help from a professional on this.