Description And Operation: 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 CAN-IHS data bus signal is received by the CSWM, 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).

The CSWM will automatically transition the output from high to low after a maximum period of 60 minutes has elapsed. The CSWM will automatically transition the output from low to off after a maximum period of 45 minutes 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 Integrated Center Stack (ICS) 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 CSWM detects a heated seat element OPEN or SHORT circuit, it will record and store the appropriate Diagnostic Trouble Code (DTC).

Driver Seat Heat Systems 

• The element consists of a cushion element connected in parallel with a back element.
• The seat cushion has a thermistor to provide feedback to the CSWM.
• The seat cushion and seat back has a thermostat to automatically open the feed to the heated seat system.
• The heated seat cushion and seat back have a thermostat to automatically open the feed to turn the heated seat system off if the temperature reaches or exceeds the operating parameters programmed to the CSWM.

The CSWM is diagnosed using a scan tool. If the module detects a heated seat element OPEN or SHORT circuit, the system will turn off and it will record and store the appropriate diagnostic trouble code (DTC). Refer to DTC TROUBLESHOOTING .