Commander 4WD V8-4.7L VIN N (2006)
Seat Heater Control Module: Description and Operation
MODULE-HEATED SEATS
DESCRIPTION
The heated seat module (3) is located under the right front seat (1). It has a single electrical connector (2) and four locking tabs that secure it to the
mounting bracket (4). The module can be accessed from under the front right seat with the seat in the full back position. The mounting bracket (4) is
bolted to the seat frame assembly (5)
The heated seat module is a microprocessor designed to use Controller Area Network (CAN) data bus messages from the instrument cluster also known
as the Cabin Compartment Node (CCN). The CCN receives inputs from the heated seat switches and in turn signals the heated seat module to operate the
heated seat elements for both front seats.
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).
