Calpod asked that a regen based brake light activation be designed for MIMA equipped Insights, as the car can slow down pretty fast if full regen is applied.
Without the brake lights to warn the guy behind you that you are slowing down, you could get rear ended if he is not awake.
The software is already working, and the Violet MIMA aux wire will pull low when the regen is greater than 15A.
The problem was how to interface to the car. If the brake switch was shorted by a relay, that would work, but as soon as the brake light is activated, the car will try to apply full regen, as that signal feeds to the MCM.
In looking at the schematics, I chose the connector in the passenger side B column as the best place to tie in. This spot is where the drive signal for the high mounted brake light is located. With this circuit, only the high mounted brake light will activate when MIMA or the car is over 15A of regen.
Any small 12V relay with SPDT contacts should work.