To all and the OP - thanks for this treasure trove of information. Before I spend what is going to end up being a lot of money, I'm trying to become as educated as possible.
I have a 2014 Silverado 1500 (LTZ), with the DL3 mirrors. I'm looking to maintain as much as the OE functionality as possible with a DL3 to DQS upgrade. Based on what I've read here, I'll either need to manually modify a wiring harness or purchase new harnesses already configured? I'm not opposed to aftermarket mirrors, but I cannot get a good gauge on quality. I think I'd rather hit the easy button and buy the harnesses.
From what I can tell...
If I upgrade to DQS and want to keep the memory seat functionality I'll need to have the BCM flashed.
I will need a modified wiring harness to enable all functionality.
Question: Is the truck wired to feed the modified wiring harness? e.g., when I plug the modified wiring harness into the truck body (effectively connecting the door components to the truck), is the truck set up to push power to the right places already?
Would you recommend specific parts for me to purchase?
Thanks much for your time.