Yes there is a seperate fuse for the seat heaters. HTDST RF is for the passenger side and HTDST LF is for the drivers side.
Its more than likely a bad element though (sorry), its flexible but the cold weather makes the seat brittle and will cause it to break (open circuit).
If you look under the seat you will find the heated seat module, there are two connectors going to it, the smaller one is for the seat elements, remove this and measure the resistance of the heater elements with an ohm meter, it should read between 5 and 10 ohms, if reads '0' then its a short ( and the fuse will be blown) or if reads infinity its an open (failed element).
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