Are you sure you are using the correct switch? I was a little confused at first myself with the dome light not working on my SLE. It is the square button (which does not really look like a button) above the round one that clicks in and extends out. You can also go to youtube and search for some informational videos gm has posted out there on the acadia. There is one that explains the dome light buttons. I tried to post the URL to it, but apparently the forum does not allow external links or something.