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I know this sounds crazy. Try unplugging the mirror and see if that changes anything. I'm having the same issue with mine when the mirror is plugged in. It's the onstar auto dim mirror.

So i bought this 07 tahoe 5.3 LT a few weeks ago. yesterday I noticed the mirror wasnt plugged in so I reached up plugged it in. After I plugged it up (mirror with onstar auto dim and compass) then tried to start it the radio shut off the dash lights all on, cycles on the dash service traction...