I've got a 2019 'Ray, and I can tell you that I've searched (and searched, and searched) for that OnStar puppy for quite a while, and haven't found it anywhere. I was initially told it was at, or near, the connection box at the battery cubby, or located next to the rear wheel well(s). Nope, didn't find it. Has anybody ever actually found the OnStar module on a C7, and if so can I get pointed in the right direction. And if anyone has a pic of the actual module where the wiring connector harness plugs in, that would be great - maybe I've seen the thing, but didn't recognize it. My previous daily driver, a Terrain, had it located to the left rear of the spare tire well, and it was marked with the OS logo. Easy to pull the plug, so to speak.