Hyundai Elantra MD/UD: Description 
and Operation - Electro chromic Inside Rear View Mirror - Body Electrical System - Hyundai Elantra MD 2010-2015 Service manualHyundai Elantra MD/UD: Description and Operation

Description
The ECM (Electro Chromatic inside rear view Mirror) is for dimming the reflecting light from a vehicle behind at night, Preventing glare from the light. The forward facing sensor detects brig ...