This vehicle equipped a front camera (23171580) to provide lane departure warning, collision warning, auto brake function, but after a front window glass change, all these functions are not available, and after research, we found GM require a 30 minutes re-calibrate window, after that I have to replace a new camera. In GM service instruction document sb-10057012-2409.pdf, it said: If after 30 minutes the original camera will not calibrate, replace the front view camera. GM provide a free replacement to vehicles under the bumper-to-bumper coverage, they knew this problem clearly. These functions are important to the safety of this vehicle, and now it's a threaten for some functions are not available. I want GM recall these cameras of replace it for free to customer needed.

- Keller, TX, USA