From the service manual concerning factory installed:
Remote Start Seat Heating and Ventilation
Some vehicles allow the customer to configure their heated and/or ventilated seats to come on after a remote start is commanded. The heated seats will only come on if the outside air temperature is below 50°F as measured by the outside air temperature sensor. When seat heating is commanded, the heating level will be on the “High” setting. On some vehicles, the LED display for the temperature level may not illuminate during remote start operation. When the vehicle operator inserts the key in the ignition and turns it to the “On” position, the heated seats will automatically turn off. Be aware that during remote start heated seat operation, since there is no occupant in the seat, the customer may comment that they feel little or no difference in the temperature of the seat. This is due to little heat transfer to the seat cover occurring since there is no weigh on the cushion. Once the seat is occupied and the seat cover is pressed against the heater element, heat will begin to transfer more rapidly to the seat cover.
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Note I posted factory installed. Dealer installed do not have this verbage which leads me to believe they may not come on during a remote start.