Jason - dark_rex is correct. There is an unused wire in the radio harness bundle that is on the dash lighting (dimming) circuit. Sorry, I can't remember the wire color but it terminates at an unused connector. It's easy to get to also!
Yes, it is in that bundle. It has a connector on the end of it. I don't remember the color but I think it's yellow or green. You might want to do a search on I-Club as that is where I found the information. It may be here on ClubWRX too.
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