Commander 4WD V8-4.7L Flex Fuel (2009)
Seat Heater Control Module: Description and Operation
Heated Seat Module - Operation
OPERATION
The heated seat module (HSM) is fed by a B+ circuit and continues to receive power regardless of ignition key position. The module is grounded to the
body at all times through the electrical connector. The HSM monitors the ignition status message on the Controller Area Network (CAN) data bus. If the
ignition state is ON/RUN then the HSM will power the heating elements. The heated seat system will turn Off automatically whenever the ignition switch
is turned to any position except ON/RUN. In response to the CAN inputs the heated seat module will control the battery current to the appropriate heated
seat elements.
When a heated seat switch CAN data bus signal is received by the heated seat module, the module energizes the selected heated seat element. If the
heated seat module detects a heated seat element OPEN or SHORT circuit, it will record and store the appropriate diagnostic trouble code (DTC).
