Circuit/System Description
WARNING: This page is about a different car, the 2016 GMC Acadia, 2016 Chevrolet Traverse, and 2016 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
The left and right heated seats are controlled by the seat memory control module. When active, power is applied to the seat cushion and back heater elements through a common voltage supply circuit. The heater elements are grounded by the seat memory control module through a low side drive control circuit. The heater element control circuit is a pulse width modulated to ground by the module in order to control the seat temperature by regulating the current flow through the heater elements. The module then monitors the current flow through the heater elements and the of rate change of the temperature sensor to verify correct heated seat operation.