I have 2015 Silverado Z71 4x4 with bose package head unit and ive tried all 3 of the factory USB ports and have come to the conclusion that Android Auto and Carplay arent installed in our 2015s. I googled it and even the AI stated 2016 was the first year for Chevy Silverados. I'd be interested in finding a work around so I didn't have to replace the entire head unit.