Low Locked Broke?

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Hi all.

I just finished searching the forum and found no info on my problem, hope you can help.

I was told at the dealership how to engage Low Locked on my 05 H2 SUT, I also read my manual about it. I checked all the fuses, they seam to be intact.

Today I was in a situation were Low Locked would have been good, and maybe even the e-locker. I stopped and pressed the Low Locked button and it just flashed and would not engage the transfer case into Low Locked. I then crawled at around 5 mph and pressed it again. It just flashed for a bit then returned back to Hi Locked. I tried in park , drive and first gear. Each time the Low Locked light flashed a few times but would not stay on showing that it was engaged. I am pretty sure it never kicked in as my crawl ratio never seamed to change. Am I missing something in my manual on how to get Low Locked engaged?

Anyone have this problem yet? If so does anyone know of anything I should check before the dredded trip to the dealer?

I'm in Nevada, so you know who I'm scared to bring my hummer to I do have the "certified used hummer warrenty" so worst case I'm coverd.
( I hope )

Any and all replies and or help would be greatly appreciated.