On-star is not working in Yukon I just bought, looking for help.

What is your question?

No green light on right side of mirror next to emergency button. Unable to figure out which fuse to check so I have checked nearly all of them on the left side of the dash as well as under the hood. Bluetooth phone feature does work but On-star does nothing at all. Dealer says several hundred to "troubleshoot" before any repairs or anything which I feel is kind of ridiculous.