I had the same issue and the following symptoms:
Initial Slight Warnings:
Random warnings in dash about Driver Side Tail Light being out, despite it working.
Major Issues later on after Carwash:
Random Warnings about 110v Outlet in use or unavailable
Running boards not working
Power Mirrors not folding
Front Window Switches or Windows Not Working
Entire Entertainment Console Suddenly Not working including all of the climate controls embedded in it, which included Heat on full blast in front defroster or not on at all
Random warnings about parking sensors or autostop systems not being available
I initially unhooked negative terminal on battery for 30 min to reset everything and it helped! I drove to Chicago 8 hours without issue. Then it randomly returned and another battery negative terminal removal didn't work this time. The error stayed on for the 8 hr drive back!
The dealer charged a $220 diagnostic fee, and started isolating the components that were offline (one of which being the lidar sensor in the drive side tail light) one by one. As soon as the tail light was unplugged - everything else in the system came back online.
There was quite a bit of water in the tail light and the connector was corroded.

