Work In Progress..
- '18 CX-9 Signature
I didn't catch that.
I wonder if it was intentional, or just incidental to a software change that caused it. I guess it would only matter if you have Remote Start.
I checked the web version of the 2019 CX-9 Owner's Manual and it mirrors what what quoted by you earlier regarding the 2019 CX-5 Owner's Manual. Looks like they changed it for 2019 in both models.. I also noticed a lot of warnings regarding low temperature burns - that may be why they changed it. I can imagine a scenario where I drive to work one early summer morning with the seat warmer on, and I forget to turn it off. Then, before leaving for the day, I remote-start it, and get caught up talking to someone while walking to the car. Now that I'm at the car (which has been sitting in the sun all day), I open the door and park my butt on a seat that is hot on the outside from the sun, AND hot on the inside from the seat warmer. Ouch.
They may have also changed it to prevent the battery from discharging quickly when the car is in ACC mode and the ignition is off. For example, if I were to drop a friend off to get their ice fishing license and I wanted to wait in the parking lot, I would park my car and turn the ignition off to save gas. Meanwhile, I'd have the radio running, and I might forget to turn the seat warmer off. That could cause the battery to drain quickly and could cause start up issues (especially if there were others in the 2nd row who also had their seat warmers on).