Hyundai Genesis (DH): Electro Chromic Inside Rear View Mirror / Description and Operation
The ECM (Electro Chromatic inside rear view Mirror)
automatically dims when it senses light reflecting 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. 

|
The compass feature is designed to be integrated into an electro chromic interior rearview mirror.
The mirror assembly shall display a compass heading.
The compass mirror then take the sensor information to
determine static field strengths and rotating field information to
determine an accurate compass heading.
Specification
Item
| Standard value
|
Rate voltage
| DC 12V
|
Operating voltage range
| DC9 ~ 16V
|
Operating temperature range
| -30 ~ +65 |
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.
Cover the forward facing sensor.