Dorman Products sells a replacement for less than $100. Used with success in a few threads.

 

It looks like those are only the backup cameras, not the rearview mirror cameras.

 

Sorry, I default to V2. If it's the Rearview Driver Information Camera, I found a site listing them for $120

 

Yeah, rearview driver information camera. It's this part: 2017-2019 Cadillac CTS Rearview Driver Information Camera 84215522 GM | GMPartsDirect.com

Could you share a link to the site? It looks like you creating a blank link in your post (it's underlined and clickable), but there's no URL (it doesn't go anywhere).

 

39098233 - Rearview Driver Information Camera GM Car Parts Online

Save Money When You Buy Your OEM Rearview Driver Information Camera - 39098233 - For Your

parts.jakesweeneychevrolet.com

You linked part# 84215522. Year make model search returns yours, and part# 39098233. Both are called Rearview Driver Information Camera. Do V3's have two rear cameras?

 

Yeah, I have the luxury package, which includes the optional rearview mirror camera (I think the official name is rear camera mirror, and I've also seen it called a live reaview). There are two cameras in the back, one for the backup view (which shows up in the CUE display) and one for the rearview mirror (which shows up in the mirror). The problem I'm having is with that second camera (part #84215522).

On a whim, I bought a random $25 raspberry pi M12 lens to see if it fixes the problem. On one hand, it confirmed that the lens was the issue since with that new lens, I get clear picture. But the lens I got has the wrong focal length (I got a 185 degree lens, and that seems to be right, but the 2.7mm focal length is too long). I could keep experimenting, but then I'll be at that $200 price point really quick, and it's prefer to spend less if possible.