There are two plugs on the back side of the wheel,..pop them out with a small flat tipped screwdriver. Oh wait, disconnect your battery first!!! then with a 10mm socket/ratchet assembly unscrew the two airbag retaining bolts. Remove the airbag.
Then disconnect the wire harnesses
03 MGM LS Black and Black Leather, Tint, Vent visors and mud flaps, BONE stock 41,400 miles, bought 3/28/09 with 21k miles for $7k