if the mirrors you got have power fold its a harness , if they sold you wrong mirror your out of luck unless they exchange them. If you had the power fold mirrors I don't remember seeing a programing needed. Its was harder with early 15's but you should be OK, sounds like a dealer fault deal.
2019 Chevy Dually Door handles/color matched 110 Gal transfer-flow bed tank / 20"AE wheels Mich. 265/60/20 defender tires /husky rear flaps /cargo box/weathertech mats.tinted glass, xpel on forward surfaces, blacked out pillars
My vin: 1GC1KVE86FF136004
I would like to get powerfolding with all the functions. I currently have the small mirrors with only two functions. power adjust and heated. I dont believe I have a temp sensor in the passenger side but i do have the trailer brake exhaust button on the center console.
The Temp Sensor comes on the Trailer Mirror Passenger Side. I'm Sure its a little easier now if you have a 2017. When I had t installed in my 2015 1st year for the trailer mirrors The new ones it was more of a task.