Grand Cherokee 2WD V8-5.7L VIN 2 (2005)
Seat Heater Control Module: Description and Operation
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.
The heated seat module operates on fused battery current received from the ignition switch. The module is grounded to the body at all times through the
electrical connector. Inputs to the module include Controller Area Network (CAN) data bus messages and standard hardwired 12 volt power and ground.
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. The Low
heat set point is about 38° C (100.4° F), and the High heat set point is about 42° C (107.6° F).
