Yeah, the top and bottom are not heated but most of the time, I think my wife's and my hands are in those areas.
I wonder why Toyota designed it that way, could it be because there is no low or high setting though I kinda noticed that when it's not really that cold, the steering wheel doesn't really become as hot as when it is really cold outside.
You would have to first check if your 2016 and those with heated steering wheel use the same clockspring.
If yes, then you would need to buy a heated steering wheel and replace your current one. Otherwise, add the cost of a new clockspring.
After replacing the steering wheel (and maybe the airbag if your new steering wheel came without one), you will surely need 2 more steps. There is a good chance that the SW teeth that go on the steering wheel column are not positioned exactly the same. You will need an alignment (at least front wheel alignment). You would also need to get your steering wheel angle sensor reset. I don't know if you are familiar with the TechStream software. Best to take it to the dealer for this. They might even do this as part of the alignment. In theory, they should.
I believe heated steering wheels are available on Canadian Limited trims, but not US Limited trims from the factory. They did add a heated steering wheel to the US 2017 Platinum but not sure if any of these are interchangeable with a US Limited...
That's correct - Only the Platinum model gets heated steering wheels in the US and even it lacks the electric windshield wiper defroster included on the Canadian car. That makes sense as I sit here in balmy Chicago where the temperature never gets cold enough to make these options interesting to many people.