ASC+T help

[adam28]

Hi guys

I have a e36 318ti compact 1999.
Right, the ASC+T works great as it should. When i switch ignition on the ASC+T light comes on and then goes off as its supposed to do so bulbs fine.
I take car out do some wheel spins and ASC+T flashes on like its meant to do and corrects wheel spin and goes back off so system works flawlessly. now the BIG BUT, I cant switch the dam thing off! i press the ASC button(tried holding down tried pressing once tried all of that) and nothing happens . Is their a common fault with the switches going wrong?

Any help with this much Appreciated

Regards