Seat Heater for Front Left Seat does not Operate [04/2018 - 08/2020]: Description
WARNING: This page is about a different car, the 2022 Toyota Avalon, 2021 Toyota Avalon, 2020 Toyota Avalon, and 2019 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
When the seat heater switch of the seat heater switch (radio and display receiver assembly) is operated, the air conditioning amplifier assembly receives a signal and operates the front seat heater.