Hardwiring Radar Detector to Rear View Mirror?

Does anyone have instructions on hardwiring a RD to the powered OnStar mirror? I found some old threads that mention connecting to the fuse box, but I'd rather stay closer and not have to take apart the interior as much as possible. Also most threads are old and the pics are gone.

I bought the Escort SmartRadar, which comes with necessary wires for hardwiring.

http://acurazine.com/forums/showthre...light=hardwire

This is the only relevant thread I've seen.

Thanks.