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

Hyundai Elantra (CN7) 2021-2025 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.

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.

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.

❮Rain Sensor

Description and operation DescriptionIntegrated Rain SensorIntegrated rain sensor (A) controls three systems: front wiper, auto-light, and central air conditioner.

Sun Roof❯

Components and components location Component Location1. Sunroof2. Sunroof switch3. Sunroof motor & controller Schematic diagrams Circuit Diagram Sunroof Switch Repair procedures Inspection1.

Other information:

Hyundai Elantra (CN7) 2021-2025 Service Manual: PM Sensor

Description and operation DiscriptionMonitor the air quality inside the vehicle in real time (PM sensor) and display the status on the screen.Automatically operate when fine dust concentration is high (Condition: Bet mode + A/C ON + 3rd speed or higher) Components and components location Components Location1.

Hyundai Elantra (CN7) 2021-2025 Service Manual: Mode Control Actuator

Description and operation DescriptionThe mode control actuator is located at the heater unit.It adjusts the position of the mode door by operating the mode control actuator based on the signal of the A/C control unit. Pressing the mode select switch makes the mode control actuator shift in order of Vent → Bi-Level → Floor → Mix.