Yes, GMC has left a key operating step out of the Owner's manual. IMAGINE THAT!!! After following instructions from manual and looking online and finding no answers, I accidentally set my clock correctly. Set the clock according to the manual but when you have finished setting the clock,THEN HIT THE BACK BUTTON TO SET THE TIME.
Does cigarette lighter work you most likely have a blown fuse in the memory of clock it is part of the stereo but has 2 fuses that function it, power and memory. If its in the radio/clock all presets on radio usually go out to, look for blown fuse.
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