There is definitely a fuse for them, but I've never heard of a 6th gen with them from the factory so maybe Toyota just put the fuse in as a standard thing. As far as getting them, there are seat heaters on Ebay for like $75/seat. Installation would be the same basic steps as installing the Vincent_Doggy seat covers, so I would use that how-to and I would wire them into the seat heater fuse just because it's there and labeled.
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