I own a 2005 Cadillac SRX and the interior reading lamps and vanity lights will not come on.
Check you fuses. A lot of times the light are on the same circuit as the cigarette lighter/power sockets. If something metal gets dropped into one of them it will pop a fuse.
It was a fuse. The dealership replaced it for me.
I love it when it's something simple!
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