Module, Heated Seat: Operation: Operation

WARNING: This page is about a different car, the 2014 Dodge Durango. However, it is still accessible from the selected car via links, so may be relevant.

The Heated Seat Module (HSM) used to control the functions of the following systems:

Vented Seats - Two vented seats can be controlled by the CSWM. Refer to OPERATION .
Heated Seats - Up to four heated seats can be controlled by the HSM. Refer to OPERATION .
Heated Steering Wheel - The heated steering wheel is controlled by the HSM. Refer to OPERATION .

NOTE:

The HSM will configure itself depending on what components are installed on the vehicle. This allows for one module to be used for every component combinations available.

The HSM will only be on with the engine running. Therefore the heated seats, vented seats, and heated steering wheel will only operate with the engine running. Seat heating and seat venting are independent systems; however, they can not be actuated at the same time. Turning the vented seats on when the heated seat are already on will turn off the heated seats and vice versa. The heated steering wheel on the other hand can be on at the same time as either the heated seats or the cooled seats.

The HSM 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 Local Interface Network (LIN) data bus messages and standard hardwired 12 volt power and ground. In response to the LIN inputs the HSM will control the battery current to the appropriate heated seat elements.

When a heated seat switch LIN data bus signal is received by the HSM, 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).

In addition to operating the heated seat elements, the HSM sends LED illumination messages to the instrument cluster, sometimes referred to as the Cab Compartment Node (CCN) via the LIN data bus. The CCN then sends the LED illumination message to the accessory switch bank so that the appropriate LEDs are illuminated for any given heating level. Pressing the switch once will select high-level heating. Pressing the switch a second time will select low-level heating. Pressing the switch a third time will shut the heating elements off.

If the HSM detects a heated seat element OPEN or SHORT circuit, it will record and store the appropriate Diagnostic Trouble Code (DTC).