Question About DL3 Mirrors

[Bizon14]

Hi guys, I have a 2014 ltz with the DL3 mirrors. I had the truck for about a month before I ever noticed that the drivers side mirror dimmed. Now that I know it's capable I pay more attention and it seems like it doesn't work as it should. It usually only dims when it's colder out. Should this dim when the rear view dims or is there another way to know when it should and shouldn't dim?

 

I've also noticed that the drivers side doesn't defrost at all. No problem with the passenger side. I was leaning towards just replacing the glass and hoping that fixed it but the dealer quoted me $200 for the glass and I didn't have any luck finding a dimming and headed mirror online. Also I'm not convinced that the glass is defective as it sometimes dims.

 

Does anyone know about the wiring for the glass? Would it be plausible that the heating element is shot and the the dimmer is going out?

 

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