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:
Check your tires, including the spare tire,
once a month or more.
How to check
Use a good quality tire pressure gauge
to check tire pressure. You can not tell
if your tires are properly inflated simply
by looking at them. Radial tires may look
properly inflated when they are underinflated.
Remove the valve cap from the tire valve
stem. Press the tire gauge firmly onto the
valve to get a pre..
Function malfunction
When Rear View Monitor is not working
properly, or the screen flickers, or the
camera image does not display normally,
we recommend that the system be
inspected by an authorized HYUNDAI
dealer.
Limitations of the function
When the vehicle is stopped for a long
time in winter or when the vehicle is
parked in an indoor parking lot, the
exhaust fumes may temporarily blur ..