Circuit/System Description

The left and right rear heated seats are controlled by the rear seat heating control module that is located behind the rear seat back cushion. When a rear heated seat is active, the module applies power through a common voltage supply circuit to the seat heater elements. The module controls the seat temperature by providing a pulse width modulation (PWM) ground through the seat heater element control circuit to the heater elements. The module then monitors the current flow through the heating elements and the rate of change of the temperature sensor to verify correct heated seat operation.