Where did he plug in the cable to?
I'm guessing you are referring to the Phone Mirroring cables? That gets plugged into a supplied HDMI and USB Combo port that is added to the Truck with the kit.
It does! Message us on the website if you would like more info, or want to make sure you get the correct mirroring kit for your vehicle.
www.gm-navigation.com/accessories/factory-video/
Do you have to buy something to mirror in 2017 Yukon?
That depends on your build, we have a couple of options for that vehicle though. Message us on our website for details on them!
www.gm-navigation.com/