differential lock problems

[caramie schnell]

i'm having a problem with the differential lock coming on in my car ('89 
audi 90 quattro) when i start it, automatically. i push the button to turn 
it off, it won't go off. also, it doesn't turn off automatically when car 
gets up past a certain speed like it supposed to.
any ideas????
e-mail
caramieschnell at hotmail.com
thank you!
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