How do you change the battery on a 2003 Cadillac CTS?

Make sure the keys are out of the ignition first. Then check to see if your vehicle has any braces holding it in place. Once you've taken any braces off, disconnect the ground wire(black), it useally takes a 1/2 inch wrench. Then take your hot wire off(red). These are all the workings of a person being self sufficient. Good luck.