First off thank you for this thread, it really helped me. I had a successful swap with parts from 1A Auto so I can clear up a few things for everyone.
DOOR MODULES:
They DO NOT need to be changed. The part numbers are the same (at least for the 12-15 yrs).
SALES CODE FLASHING:
If you plug in the new mirrors and some features do not work, most likely you just have to flash the sales codes. I had to do this and it worked fine. I do suggest calling around to the dealerships in your area or however far you are willing to drive. I was quoted $65-175 so it will pay off. If you don't want to flash the codes, the functions that are currently flashed in your truck will work. Example: if you had heated, power adjust mirrors and you are upgrading to the heated, power adjust, turn signal, puddle light mirrors, then only the heat and power adjust will work on the tow mirrors. When flipped up, the controls will be 90 degrees off.
INSTALLATION:
Super easy! There is a video on youtube to take the mirrors off and the installation is the reverse. Took me 30 mins which most of the time was spent explaining how everything works to my buddy.
PARTS:
I bought the $330 tow mirrors with puddle lights, turn signals, and heat from 1A Auto. Exact fit and operation, extremely happy!
DEALER SWAPPING:
I spoke to every dealer in my area and everyone said that the mirrors cannot be swapped. They absolutely can, just they will not do it. I was curious how much the OEM parts would be and I almost died when they quoted me $999!
ERROR CODE & TEMP SENSOR:
For the '13-15 mirrors, they have the temp sensor in the driver side mirror. If you install a mirror without the temp sensor, it will show an erroneous temp on the EVIC and throw a code. Mirrors that do not have the temp sensor are '12 and older. You CAN put a '13-15 mirror on a '12 or older. As for error codes, if you install the new mirrors and do not wish to flash the computer, it WILL NOT display an error code. The only issue is that some features may not work on the mirror as described in the "SALES CODE FLASHING."
POWER FOLDING:
**I DID NOT DO THIS** Speaking with a few people and reading through the threads here, I know there is interest in swapping to a power folding mirror, and there is some confusion. The only info I can add is I heard a rumor that a '13-14 power folding mirror will not fit on a non-powerfolding mirror '13-14, but a '15 power folding mirror would fit on a '13-14. I do not know if this is true but if you did this or know it can be done please let us know!
I hope this helps clear some confusion! If you have any further questions please ask or if you can back up anything sound off!