I can confirm that the 18 models do have auto-heated steering wheel. I haven't had much of a chance to use that since I got my car 3/30/19, but it has worked the few times that I've done it. I cannot remember whether the indicator on the steering wheel lights up when it's on during remote start, though.
The auto-heated/cooled seats also exist on the 18 models, and I've seen the indicators light up during remote start (although my owner manual says they "may not" come on during this operation).
What caught my eye (as to the indicators during remote start) was that my DTS had auto-heated (but not auto-cooled) seats ... and the indicators (in the door panels) would light up accordingly. Whether there was a passenger the last time the car was started would make a difference whether the passenger seat would auto-heat during remote start. I've see my car do both driver and passenger seats during remote start, even though most of the time, it's only me in the car. Once I turn on the car, the indicators would go out and the driver side would then come back on (if I'm alone in the car) if the HVAC system called for it (I have it set for auto-heat/cool as part of the climate control system, and as part of remote start process).
The auto-heated/cooled seats also exist on the 18 models, and I've seen the indicators light up during remote start (although my owner manual says they "may not" come on during this operation).
What caught my eye (as to the indicators during remote start) was that my DTS had auto-heated (but not auto-cooled) seats ... and the indicators (in the door panels) would light up accordingly. Whether there was a passenger the last time the car was started would make a difference whether the passenger seat would auto-heat during remote start. I've see my car do both driver and passenger seats during remote start, even though most of the time, it's only me in the car. Once I turn on the car, the indicators would go out and the driver side would then come back on (if I'm alone in the car) if the HVAC system called for it (I have it set for auto-heat/cool as part of the climate control system, and as part of remote start process).