After seeing the other cruise control installs, I decided to have a go at my 2011 1LT sedan. I purchased the switch, GM part number 96943033, online from gmpartsdirect.com. I also purchased a pack of narrow female spade connectors to plug into the back of the switch and used two lengths of 16-gauge wire. All together, I paid around $40 for all the parts.
I started by removing the lower panel from the dash and the steel panel behind it. The plastic panel unsnaps and the steel panel unbolts. This is what you will see when you remove both panels.
The plug right there mounted to the reinforcement is the one you want to tap into. Tap into the brown wire at the top of the plug and the gray wire at the bottom. I used Scoth Locks, but you could use your preferred method. I was mounting my switch to the upper steering column cover so I ran the wires up into that area.
I removed the upper steering column cover and found to self-tapping screws long eonough to fit through the holes in the switch. I trimmed the locating pins and some of the under structure of the switch so it would fit the curve of the column cover a little better. Then I cut a whole in the cover to feed the wires through so they could plug into the switch.
I Put the column cover back together, crimped the female spade connectors onto the wires and then plugged them into the switch. Then, using the self-tapping screws, I attached the switch to the upper right side of the top column cover. I am working on a little closeout panel to cover the bottom of the switch so it looks a little nicer.
I took the car for a test drive and the cruise control worked perfectly. My commute just got a lot easier.