e-locker failure

[Wisha Haddan H3]

My e-locker failed on the trail yesterday. It worked at the bottom of the trail, but later when I engaged it the light would blink for 15 secs and then turn off. Tim and I tried every combination we could think of to reset it, but nothing worked. btw this was in 4-lo at a complete stop. And yes I was pushing the right button

There's no message in the DIC and no codes according to onstar. I'll call the dealer after the holiday, but is there anything I can try in the meantime, like disconnecting the battery cable for x minutes? Is there a fuse for the e-locker? I couldn't find one in the fuse box.