Signal mirrors

[The Tin Man]

Does anyone know how to wire a 2017 Canyon Denali 4x4 gas for towing mirrors !!  Or a schematic on how to ! I have power and heated mirrors but I don't see the wiring that goes to them for turn signals . You'd think GMC would have them there for future up grades and they don't even offer them for the Canyon Denali's .  Thanks for any help !!

[newdude]

http://www.clearviewmirrors.com.au/13482/COLORADO-RG---2012/

 

https://www.youtube.com/watch?v=_GemmhoA_ck