Hyundai Sonata: Description and Operation - Electro Chromic Inside Rear View Mirror - Body Electrical SystemHyundai Sonata: 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.

Operation
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°C (-22 ~ 149°F)
Direction display
8
Renewal time
2 sec.

Switch Point Accuracy
The compass module shall, while compensating for the vehicle magnetic fields, until the Earth's varying magnetic fields to determine direction.
[Switch points]
Switch Point
Heading ± 10°
N - NE
22.5
NE - E
67.5
E - SE
112.5
SE - S
157.5
S - SW
202.5
SW - W
247.5
W - NW
292.5
NW - N
337.5

   
There should be hysteresis at each switch point.
Switch points between the 8 cardinal directions, these switch points are ± 10°

Compass Display Interval
Compass display should be updated at every two seconds.
Function
The compass can be turned ON and OFF and will remember the last state when the ignition is cycled. To turn the display feature ON/OFF :
1.
Press and release the feature control button (A) to turn the display feature OFF.
2.
Press and release the feature control button (A) again to turn the display back ON.
Additional options can be set with press and hold sequences of the feature control button (A) and are detailed below.

There is a difference between magnetic north and true north. The compass in the mirror can compensate for this difference when it knows the magnetic zone in which it is operating. This is set either by the dealer or by the user.
    Components and Components Location
    Components (1) Components (2) Components (3) ...

    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. Cover the forward facing sensor. 3. Head a light ...

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