Seating - Heated: Notes
Overview
This system allows independent seat electrical heating of each front seat on demand.
The components of the system are:
- seat heater mats (located on the seat cushion and backrest).
- the HVAC module.
- heated seat buttons (located on the touchscreen interface).
Remote Start Climate Operation (if equipped)
The customer can select different climate control modes/preferences when the vehicle is started using the remote start feature. This can be accessed through the message center. For additional information on how to set the remote start preferences, refer to the Owner's Literature. When the driver seat and/or passenger seat is set to AUTO mode, the driver/passenger heated/climate controlled seat activates in full heat mode when the outside temperature is less than 0 ° C (32 ° F) and full cool mode (climate controlled seats only) when outside temperature is greater than 26.7 ° C (80 ° F) any time the vehicle is started using the remote start feature. No heated/climate controlled seat adjustments are recognized during remote start operation. Once the ignition is cycled to the ON position, the heated/climate controlled seat returns to the previous settings (last ignition ON cycle) and adjustments can be made normally. If the previous setting was off, the heated/climate controlled seat turns off.
System Operation
System Diagram
Network Message Chart
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Climate control touchscreen and voice requests | APIM | The climate control requests message contains the heated seat system request information. When any heated seat function is requested using the FDIM (touchscreen), this input is used to activate the heated seat system. |
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Climate controlled seat set status | HVAC Module | The climate controlled seat set status message provides the current status of the heated seats to the APIM. The APIM then updates the displayed status of the heated seat buttons on the FDIM (touchscreen). |
The driver and passenger heated seat buttons are selected from the touchscreen interface. When the heated seat button is pressed on the touchscreen interface, the APIM sends the request message to the FCIM over the I-CAN. When a heated seat request message has been received from the APIM, the FCIM sends the request message to the IPC over the I-CAN. The IPC sends the message to the BCM over the HS-CAN. The message is then sent to the HVAC module over the MS-CAN. Upon receiving the request, the HVAC module supplies voltage to the appropriate driver and/or passenger seat cushion and backrest heater mats.
Heated Seats
The driver and passenger heated seat control buttons and indicators are located on the touchscreen interface (FDIM). The FDIM is mounted directly to the APIM. The heated seat system functions independently of the vehicle's climate control system. Each time the heated seat button is pressed, the APIM sends the request to the FCIM using the I-CAN. The FCIM sends the message to the IPC using the I-CAN. The IPC sends the request message to the BCM over the HS-CAN. Finally, the BCM sends the request to the HVAC module which decreases one setting (the sequence is high, low, off, high, etc.).
When activated, the HVAC module supplies voltage to the selected seat's heater circuit. Each seat's cushion heater mat and backrest heater mat is connected in a series circuit to the HVAC module and powered by the output circuit for that seat. The HVAC module monitors inputs from a temperature sensor located in each seat's cushion heater mat, and maintains seat temperature by cycling the heater circuits on/off. The heated seat remains ON until the heated seat switch button is pressed to cycle the HVAC module OFF or the ignition is set to OFF.
If a fault is detected by the HVAC module, the module stops supplying voltage to that individual left or right seat that the fault was detected on until the ignition is turned OFF and then ON.