Description And Operation: Description
Comfort Seat Wheel Module (CSWM) (1) is located under the passenger front seat. It has multiple electrical connectors (Controller Area Network/CAN + POWER, Front Heat, Front Vent and Heated Steering Wheel connections) and a push-pin style retainer that secures it to the seat pan. The module can be accessed from under the passenger seat with the seat in the full back and up position.
The CSWM is a CAN - Interior High Speed (IHS) bus microcontroller providing outputs to the power seats, heated seat pads, heated steering wheel, and ventilating up to two seats. The CSWM receives commands over the CAN-IHS bus from the various modules. The seat thermistor is hard wired to the CSWM.
Heated Seats - The CSWM uses a Pulse Width Modulation (PWM) to provide power to the seat cushion and back heating elements. The temperature sensor thermistor is located in the seat cushion. The thermistor sensor feedbacks from each seat heating element to the CSWM to regulate the heater outputs to prevent any seat temperature to rise above set points. Seat heating has two selectable heat settings which are HI and LO. Depending on thermistor reading, the CSWM will start the heater output by adjusting the PWM heat level according to the calibration table.
Vented Seats - The seat venting has two selectable speeds for the fans. For seat venting, each press of the switch button will cause the seat to change venting modes. The CSWM has a single low side control signal to control each vented seat. The CSWM does not directly drive the vent motors.
Heated Steering Wheel - The CSWM provides power to the steering wheel heating element. The heated steering wheel is standard when the vehicle is equipped with front heated seats. During normal operation, the CSWM will switch on the power for the heated wheel only if the engine is running. The heated steering wheel temperature sensor sends that information over a Local Interface Network (LIN) bus through the Steering Column Control Module (SCCM) to the Body Control Module (BCM). The thermistor sensor feedbacks from the steering wheel heating element via the CAN-IHS bus to the CSWM regulating the heater output to prevent the wheel temperature to rise above the maximum threshold temperature set point.