My auto dim mirror isnt working and never has my green light would turn on n nothing happened now that doesent work how much would it be for a new one on an 05

 

test it, by taking a flash light to the sensor eye.
I'm sure it has always worked, but you never noticed.

and the green light isnt on, any more?

 

Punctuation in that sentence would have been helpful.

Did you try pushing the button on the right side of the mirror to activate the auto-dimming?

Sometimes people accidentally push the auto-dim switch while cleaning the car or moving the mirror.

 

no i didnt even know there was a switch there but my green light when i push the button on the bottom doesnt come on anymore