Driver Dimming Mirror Not Dimming

[WS6FirebirdTA00]

Hello, looking for some advice on troubleshooting my driver auto dimming mirror that has failed and is no longer dimming it’s a 2018 Sierra.
 

I’ve been trying to search for this and the only results I really come across are ones where the dimming is stuck on. I was hoping to find some information on the wiring to do some troubleshooting and see if it was a signal issue or a hardware issue.

 

The rearview mirror works fine. I figured one place to check would be the wires where the mirror folds. I regularly fold mine up and wonder if something just failed in there. I wasn’t sure if anyone had any other tips before I started digging into this. A little hesitant to tear into the mirror if I don’t have to, I don’t want to break any of the plastic.

 

It’s been several months since I drove in the dark so no telling when this happened. I’m a little concerned when I removed the center roof console to run a dash cam, maybe something happened in that area. I made sure everything was plugged in and was not pinched.

 

I appreciate any tips or advice you all may have. I was hoping to find a common issue with recommendations, but struggled to even find one.

[WS6FirebirdTA00]

Fixed it. Mirror was bad. Installed new part number 84499222. Looks like the factory unit had poorly soldered connections. Hopeful I may be able to fix and have a backup.

 

Super easy to remove also. Tilted the mirror all the way down and popped it straight up. Found this link on YouTube that made it easy. Took me just a couple minutes.