I will do a little looking around when I do the first service on my 2012, I think I know what they did, but is only speculation at this time. When they went to the programable function on the EVIC for the 4 different brake requirements, I suspect there is a sensor in the hydraulic system that provides information to the controller. Brake Smart has a fluid line that goes to the controller, in the OE controller, my guess the sensor is in the hydraulic system, then is connected with electronics to the controller, the question where is the sensor?, I will find it, mine has no delay on the trailer brakes at all, so something is there.