What kit do you have for the XM?

If you have the Blizsafe kit from EAS is very easy to install. If not disregard the rest of my post.

To install take one plug from car radio (cd changer) and plug into the blizsafe then that into the xm commander then connect the antenna to the commander and place it on the top of the truck. All the seals around the rear door come off to hide the wire. The wire from the radio is located in the driver side rear quarter panel, near the bottom. There is only one wire that will fit properly (the one for cd changer). Hope this helps.