Well it seems as if even the dealer can't seem to get DL3 to DQS mirrors correct. Just bought a new Silverado LTZ CCSB this past week and went ahead and ordered the towing mirror upgrade as I have very little time to DIY during this time of year, the wife has me spending all my free time making Christmas gifts. Picked up the truck from the dealer and didn't realize that neither the puddle lamps nor the power fold are working correctly until I got home. And I have to be in Miami Sunday and can't take it back to the dealer and have them fix it.
I did get dealer to give me the factory DL3 mirrors back and may consider putting them on my wife's truck (2016 LT CCSB) sometime after the new year....work permitting. From what I have read all the functions that are in the DL3 mirrors are in the existing wiring harnesses that are in the truck from the door to the cab are present but the internal wiring harness in the door needs to be changed out. Shouldn't need the RZY harness at all ( I hope ). All I would need is the new harnesses from pgamboa and a new power mirror switch for the power fold option. Please correct me if I am wrong.
And I'm still pissed at the dealer, power fold would have come in super handy parking in Miami.