Just put a homelink mirror in my 16 Pro4, but it only had a 3 wire harness. Positive, negative & constant. Hooked up the 3 and homelink works along with the direction(N,S,E, etc). The stock wiring has these plus a purple and brownish. The plug on the harness has 9(I think) pins. Which of the 2 is the wire for the outside temperature?