Originally Posted by onehundred80

Turn both taps on the bypass kit to integrate both circuits and see if the SC works and see if the level of the coolant in the overflow tank has dropped noticeably. If this is so then I would say the inter-cooler is leaking.
I cannot see a connection to the light though if the above is the case.
I wonder if a brake switch or MC pressure switch failure would make the car switch off the SC as if there was a total brake failure. Check the car for any fault codes set.