Does anyone know where the auto dimming mirror plugs into?

i asked my dealer about it because i was going to purchase one as an accessory, but they made it seem like you have to tap into wires, that there is not a real harness already existing. i dont find that true because some of the wranglers like 2003-2005 had a harness already in the a pillar area for one.

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2007 Jeep Liberty XSport Competition Edition
Cragar Soft 8's
Alpine iDA-X300
Communications System Provided by: Cobra CB
Navigation provided by: Garmin

curious about this too....maybe a mod Ill do in the future

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2003 Jeep Liberty Freedom Edition
3.7L 5-spd 4x4, Rusty's 2.5 in. coil lift
General Grabbers AT2's 245/75-16E on MOABS
EVIC installed, iPod wired, Hella 500's and Grilles
Mopar Bike Rack, Mopar Roof Rack, Black Widow Roof Basket w/ air deflector
Draw-Tite Hitch, Front Tint, Debadged on sides and front

I have a mirror out of a tj as well as the tj harness. Just trying to make it work. I know i have to do some spicing but if i can figure out if there is a factory spot it will make it easier.