What I did is remove the ashtray, remove the screw under it. Then lift the unit up & back the whole thing comes out in one unit.
There are three connectors attached to this, you want the largest (brown) one.
Peel back the wire covering & locate the purple & white wire. This is hot when the switch is on. Use the ground from the cigg lighter.
I fished the wires into the glove (something,on this car that is basically useless) I have the xm & extra outlet there.
I only listen to one station on xm so I don't need to see it or have it within reach. If you do then bring the wires out at a different location as fits your needs.