Preston W

So I have a 2015 Chevy Silverado 1500 LT that I just replaced the basic OEM mirrors that only had the motor function in them with some tow mirrors that have the motor function, blinker, perimeter lights, and defrost on them but I naively thought it would be plug and play when buying them. They were sent with a wiring diagram, which I admit, is not my strong suit and some sort of wire harness I’m not sure what to do with. Basically, the mirrors fit and I like them but just the motor function on them works and I’d like to get it so the blinker, lights, and defrost also works on them. Any advice on what I can do or where to start?