2005 caddy STS traction control question?

Our STS has no indicator light for the trac control and I think it is not functioning.
Anybody know of fuses or relays or something a general knowledge type mechanic can do to check this system instead of paying caddy a buttload of money to do it.
Thanks for any help.
Update: Thanks for the response but I get NO light or no light on if its supposed to come on when the button is pressed making me think the system is out.
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