Hyundai Santa Fe: Description 
and Operation - Electro Chromic Inside Rear View Mirror - Body Electrical System - Hyundai Santa Fe DM 2013-2018 Service ManualHyundai Santa Fe: Description and Operation

Description

The ECM (Electro Chromatic inside rear view Mirror) is intended dim the reflecting light in the rear view mirror. The forward facing sensor detects brightness of the surroundings, while the rearward looking sensor is for the light from the rear. The strength of the light in the rear sensor is used by the mirror to adjust the shading. It ranges from 7 to 85%. When the reverse gear is engaged, it stops functioning.
1.
The forward facing sensor sees if the brightness of the surroundings is low enough for the mirror to operate its function.
2.
The rearward looking sensor detects glaring of the reflecting light from a vehicle behind.
3.
The ECM is darkened to the level as determined by the rearward looking sensor. When the glaring is no longer detected, the mirror stops functioning.
(1. LED indicator , 2. ON/OFF Switch , 3. Rearward looking sensor , 4. Forward looking sensor )


Automatic-dimming Function

To protect your vision during nighttime driving, your mirror will automatically dim upon detecting glare from the vehicles traveling behind you. The auto-dimming function can be controlled by the Dimming ON/OFF Button :
1.
Pressing and holding the Feature Control button for more than 3 but less than 6 seconds turns the auto-dimming function OFF which is indicated by the green Status Indicator LED turning off.
2.
Pressing and holding the Feature Control button again for more than 3 but less than 6 seconds turns the auto-dimming function ON which is indicated by the green Status Indicator LED turning on.
The mirror defaults to the "ON" position each time the vehicle is started.

    Repair procedures
    Inspection Check it by the procedure below to see if the function of the ECM is normal. 1. Turn the ignition key to the "ON" position. 2. ...

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