Hyundai Elantra: Electro Chromic Inside Rear View Mirror / Description and operation
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. 

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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. |
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Other information:
This system helps to protect your vehicle
and valuables. The horn will sound and
the hazard warning lights will blink
continuously if any of the following
occur:
-- A door is opened without using the
remote key or smart key.
-- The trunk is opened without using the
remote key or smart key.
-- The engine hood is opened.
The alarm continues for 30 seconds, then
the system resets. To turn of..
Bright-metal maintenance
To remove road tar and insects, use
a tar remover, not a scraper or other
sharp object.
To protect the surfaces of bright metal
parts from corrosion, apply a coating
of wax or chrome preservative and rub
to a high luster.
During winter weather or in coastal
areas, cover the bright metal parts
with a heavier coating of wax or
preservative. If necessary, ..