Hyundai Elantra (CN7): Body Electrical System / Electro Chromic Inside Rear View Mirror

Hyundai Elantra (CN7) 2021-2026 Service Manual / Body Electrical System / Electro Chromic Inside Rear View Mirror

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.

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.

Components and components location

Components (1)

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 to the rearward looking sensor.
4.
The ECM should be darkened as soon as the rearward looking sensor detects the light.
   
•
If this test is performed in daytime, the ECM may be darkened as soon as the forward facing sensor is covered.
5.
When the reverse gear is engaged, the ECM should not be darkened.
When heading lights to both the forward facing and rearward looking sensors, the ECM should not be darkened.
Removal
1.
Remove the inside rear view mirror cover (A).

2.
Using a remover and remove the rain sensor cover (A).

3.
Disconnect the inside rear view mirror connector (A).

4.
Loosen the mounting screw and remove the inside rear view mirror (A).

Installation
1.
Install the mirror making sure the mounting bracket not to be damaged.
2.
Install the mirror wiring cover and rain sensor cover after reconnecting the connector and tightening the screw.

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