So I don't believe I've noticed them working in the time I've had the car; only a few months of summer (first winter). Went outside and made sure I have power at the seat connector in hi/lo modes. Then checked the resistance of the heaters themselves. Driver side was "0/open" and "13M ohms" and the pass side, both were about "13 ohms".
I'm sure one of the driver side heaters is messed up, but the pass side ... not sure what I should be getting. Anyone have any numbers I should be looking for? With the numbers I got, I'm assuming the pass side is good and should work?