If you want to install the 2021 power fold tow mirrors with cameras, running lights and trailer spot lights on any 2019+ 5th gen 1500, and have all the features work correctly, you will need driver door module 68517699AA, and passenger door module 68517698AA. All circuits are the same, and these modules have the port for the third green mirror connector that carries the running lights and trailer spot lights wires.
The settings changes are:
Doors: Power Folding Mirrors Present- YES
Doors: Tow Mirrors Present- YES
Doors: Mirror Running Lights- YES
Doors: Mirror Rear Guidance Lights- Yes
CustSetMenu 3: Rear Cargo Guidance Lights Enable/Disable CSM Present- YES
If your truck originally came with auto dimming mirrors, change these settings:
Doors: Electro-Chromatic Driver Mirror Present- NO
Doors: Electro-Chromatic Passenger Mirror Present- NO
If you have a 2021 with standard power folding mirrors, and you want to swap in the fully loaded tow mirrors, you already have the correct door modules, and you’ll make the same changes as above (power folding mirrors will already be set to yes).