was driving home last night and thought that the rear windscreen looked dark, so this morning i put my hand on the back of the unit and it went dark 
i had no clue i had an auto dim rearview mirror ( shows how much i use it) . so i got parked early today and was waiting for my mate to arive so was looking at all the dirt as i havent gave the inside a clean in a few months, i then had a look around and saw a tiny hole on the light switch control unit with a tiny square sensor inside :? does anyone know what this does???
i had no clue i had an auto dim rearview mirror ( shows how much i use it) . so i got parked early today and was waiting for my mate to arive so was looking at all the dirt as i havent gave the inside a clean in a few months, i then had a look around and saw a tiny hole on the light switch control unit with a tiny square sensor inside :? does anyone know what this does???