I don’t think my heated seats turn in until I have been seated in the car. Is this correct?
That is correct for my vehicles, they are self heating, you heat them yourself.
Depends on your manufacturer. Ones I have had started to heat when you turned them on and heated to the setting you set it at. Some might have a switch that over rides and activates only when you sit.
My JD lawnmower won’t start if my grandson wants to mow because of his weight.