How did you mod your '11 to come on with RS?
I have owned 3 Gen7 models as of this writing. The first was an '09, the second was an '11 that I lost to a flood, and this third one is an '11 as well. It was the second one where I modified the heated seats.
What I did first was add 2 switches to the overhead console. Each one controlled one seat and they were labeled "Hi Off Lo". Through some investigation I discovered that the switch sends two different voltages to the heat module, one for low and one for high. I used some inexpensive diodes in series because I found out that each one drop the voltage by 0.3V. I can't remember the exact voltage, but as I recall it was only a few volts lower than battery voltage so all I had to do was put a few diodes in series for high, then another 6 or 7 diodes for low. I also had 2 LEDs to indicate the selection - 1 was low, both were high.
I ordered the same switches from
Del City (dot) com recently so stand by for a How-To thread about doing it! (That link is to the page with the actual switches.)
To know when the car had been started by RKS I used a bunch of relays that I lined up under the rear seat, where it was easy to reach, large enough to hold them (8 or 10!), and protected by the metal bar that spans the car. In the upcoming modification I intend to use some kind of electronics, such as an Arduino or an IC programmed by using the Arduino, but I'm not sure yet how it will turn out. The electronics will be easier to manage, smaller, consume less current, and I can reprogram it as needed without having to cut and re-solder a bunch of wires. (Yeah, it was as neat as possible but it was a huge challenge to get it right!)
Here is a link to the How-To for the single switch and 3 LEDs that I installed in the OH console before adding the 2 heated seat switches:
Overhead Console: Adding a switch and lights --- CLICK HERE