so the other day my 21 started out of nowhere having no dome lights besides the last set in the cargo area, The lights under the seats and dash still come one but the Onstar center is black and no lights even when i command all of them to come one with holding one of the lights one, like you do normally for all lights to come on. I have checked all fuses but did not find one that is designated towards just the lights. The garage door buttons still work and Onstar itself still works just no lights. Can anyone send me in a better direction to fix this or maybe which fuse/relay these lights might be one?

 

Welcome from Florida. Checking all of the fuses is the best way to go. Things are on fuses that they are not marked for.