Originally Posted by PAT
It's much easier to remove the overhead console and tap into a switched wire. I can't remember the color combination, but I used a test light to find a switched wire, and used a tap I got from AutoZone. The tap has a female spade connecter, and I plugged the X50 hardwire spade connecter into the tap. Roll up the excess wire, push gently against the headliner from the top side, and slip a small length of wire out to where you want to mount the X50. It's easy to do, and the instructions for removing the overhead console are in the manual. The entire project took less than 30 minutes.
The dealer told me to tap into the fuse box direct. Tapping into a wire, overloading a circuit and frying a computer could be grounds to void your warranty. The fuse box has lots of vacant slots, so why not use them. I originally had it tapped into a wire in the overhead light area but opted for the safer install to avoid warranty dispute situations.