The reason you do not see it blink is because...as stupid as it sounds....there's already icon's being shown, like the diff lock and 4x4. As long as you hold it down long enough, it does turn it off, you just don't see it actually blink. I've tested this a few times with mine.....I usually put it in 4x4 first, then ORM then hold down TC, then you will see it it blink. However, the TC resets itself (the holding down part that is) when you go in and out of 4x4 believe it or not.......so if you hold down TC first and let it blink then put it in 4x4, you have to hold it in again. But for what you're describing, just hold it in for a good 10 sec. and try it and you'll see that it does infact still turn off. But remember that you have to hold it in again if you go back in or out of 4x4.