Here are the instructions for installing the digital rearview mirror in the RAM.
Part List:
Mirror with 1 Video Input Channel, no FCW or ACC - 68448639AB
Mirror with 1 Video Input Channel, with FCW or ACC - 68448641AB
Mirror with 2 Video Input Channel, no FCW or ACC - 68519111AA
Mirror with 2 Video Input Channel, with FCW or ACC - 68519222AA
Center high mounted stop lamp with camera - 68551077AB
10' Fakra Z - Female to Female
Amazon.com[/TD]
Parts if you have a 2019/2020:
2021+ BCM - 68496414AD
Wiring Harness from Jimmy07
You only need one of the mirrors. Just choose the one that fits your vehicle and if you want to have 2 inputs or not. You only need the 2 inputs if you plan on adding another camera like cargo, trailer, etc. For the 2019/2020 you will need a 2021+ BCM and the wiring harness from Jimmy07. You can get a used one from a junkyard. You can then stash this under the driver's side dash or the front seats.
Installation is fairly simple. Replace the CHMSL with the new one. Run the cable in the headliner from it to the mirror. Replace the mirror with the new one. Connect the mirror, truck and BCM using the wiring harness. Start the truck and enjoy your new mirror.
2019/2020s will lose auto dimming side mirrors. You can swap your BCM for a later new one (not used), but you would need the dealer to restore your configuration. If you swap it yourself, you'd need to do it at the dealer because it won't work right until the restore is done.
For 2021+, use AlfaOBD to set the following settings for auto dim mirrors to work.
LIN & Misc: CRVMM Present to NO
CBC Config I/O Usage: RVDM Present to YES
