Description And Operation
The Comfort Seat and Wheel Module (CSWM) receives the driver's seat position controls from the switch panel arranged by the side of the backrest. After receiving the input commands, the module processes them and sends power to the three electric motors installed on the seat.
The CSWM is a Controller Area Network - Interior High Speed (CAN-IHS) bus module providing outputs to the heated seat pads and the heated steering wheel. The CSWM receives commands over the CAN-IHS bus from the Body Control Module (BCM). The seat thermistor is hard wired to the CSWM.
On the CAN-IHS, the CSWM receives:
- Front seat and steering wheel activation request information from the Heating Ventilation Air Conditioning (HVAC) module.
- The BCM steering wheel temperature value. The steering wheel temperature sensor sends the value to the steering wheel switch bank which communicate the message via LIN to the BCM.
- The CSWM stores the position of the driver's seat and of the wing mirrors when a store buttons "1", "2", "3" arranged by the side of the seat is pressed and held for a few seconds.
- CSWM module
- Horizontal Power Seat Motor
- Vertical Power Seat Motor
- Seatback Power Seat Motor
OPERATION
The CSWM 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 CAN-IHS bus data bus messages and standard hardwired 12 volt power and ground. In response to inputs, the CSWM will control the battery current to the appropriate heated seat elements.
When a heated seat switch IHS data bus signal is received by the CWSM, the module energizes the selected heated seat element.
The CSWM will automatically transition the output from high to low after a period of time has elapsed. The CSWM will automatically transition the output from low to off after a period of time has elapsed.
In addition to operating the heated seat elements, the heated seat module sends LED illumination messages to the Instrument Panel Cluster (IPC). The IPC then sends the LED illumination message to the switch so that the appropriate indicators 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 CSWM detects a heated seat element OPEN or SHORT circuit, it will record and store the appropriate Diagnostic Trouble Code (DTC).