I have both a garage door and a gate to get into my community. Therefore, I really hate carrying around 2 remotes, or having loose remotes in general. All my cars have homelink in them, and the ones that don't get it installed. I added a Homelink to a 2012 LS Silverado by just buying the kit that goes in an LT, and I added Homelink to a 2008 Pontiac G6 by buying the same part I am adding to the Bolt.
Since I had already put this same unit in the Pontiac, I already knew the basic procedure. The only difference with the Bolt was finding the right power source once I got into the overhead lighting console. Here is what it looks like when I was done:
Here are some basic instructions. The unit's part # is 60-HMLKV5ALL:
It comes with 3 different button bezels - gray/black/tan. I used the gray as you can see in the picture above. The part can be found online for $120-$150.
You have to pull down the ceiling console where the interior lights and OnStar buttons are, connect the Homelink to the power source the light uses, cut a small hole in the console bezel and then attach the unit there, and then put it back together.
Here are some details.
Key tools I used are a what I call a clip separator, and a Dremel/Rotary tool to cut the plastic overhead console bezel/plate in order to install the buttons/homelink. I also used a drill to drill a small hole to connect the ground wire to a metal spot as well as typical wire cutters to cut and strip the wiring to connect power.
The trickest part of this are discussed below:
A) removing the ceiling light console
This is where I use the clip separator. There is a faceplate which you see that can come down fairly easily, but it is also useful to remove the light fixture assembly also. The light fixture assmebly (white plastic peice below) has 4 clips that clip into metal holes in the ceiling of the car. Here is a picture after I removed it.
To wire to power, I used a mutimeter to find constant, non-switched power. There is a wire harness that plugs into the side of the white light assembly shown above. I found that the white wire with red stripe has constant power, so I connected the power for the homelink to that. Note that this is a Premiere model, but I imagine the LT is the same as far as this wire harness is concerned and the white/red wire supplying power. See below.
I used a simple splicer to connect the 3 wires. the red wire is the Homelink unit's power connection.
The other wire that you need to connect from the homelink is a ground wire, which I chose to connect to the chassis by drilling a small hole in the console bracket, and then attaching with a metal tapping screw. Also, note in this picture that you can see two of the holes that the white console light assembly clips into, which I used the clip separator tool to disengage from. See below.
At this point, the Homelink module is connected to power. Now it needs to be attached to the button assembly/bezel. Unfortunately I forgot to take a picture of what that looks like, but here is what it looks like when I cut the hole in the overhead console plate with the Dremel, and placed the buttons/bezel on to size it.
I didn't do the cleanest grinding job, but it doesn't matter because the button bezel covers all that. You get a template to help cut the right sized opening. One modification I had to make was that the homelink module didn't quite fit correctly using the placement you see below. I recommend attaching the white light assembly to the cover plate I am showing below and THEN deciding where the homelink should be placed. I ended up having to move it down about 3 mm from the location where you see it below once I tried to put it all back together.