help !!! High Idle Mod no longer works

[mx730md]

my high idle mod no longer works, i havent used it since winter time and i went to hit it yesterday since it was like 105* out side to get some cold a/c right away and it no longer works. i tried swaping out the switch for a new and it still doesnt work. any one have any idea's? the only think i can think of is i did put a sct custom tunes on it since winter time. will the effect the high idle switch. thanks