Hyundai Elantra: Air Conditioning System / Photo Sensor

Hyundai Elantra (CN7) 2021-2025 Service Manual / Heating, Ventilation and Air Conditioning / Air Conditioning System / Photo Sensor

Description and operation

Description

1.	The photo sensor is located at the center of the defrost nozzles.

The photo sensor contains a photovoltaic (sensitive to sunlight) diode. The solar radiation received by its light receiving portion, generates an electromotive force in proportion to the amount of radiation received which is transferred to the automatic temperature control module so that the solar radiation compensation will be performed.

Repair procedures

Inspection

1.	Emit intensive light toward the photo sensor using a lamp, and check the output voltage change.

The voltage will rise with higher intensive light and reduce with lower intensive light.

1. Auto light signal
2. Auto light ground
3. Photo signal (RH)
4. LED power (B+)

5. LED ground (To BCM)
6. Photo signal (LH)
7. Photo power (SW)
8. Auto light power (5V)

Replacement

1.	Disconnect the negative (-) battery terminal.

2.	Remove the photo sensor cover (A).

3.	Press the lock pin, separate the connectors (A).

4.	Remove the photo sensor (A).

5.	Install in the reverse order of removal.

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Function malfunction and limitations

Function malfunction

When High Beam Assist is not working properly, the ‘Check High Beam Assist (HBA) system’ or ‘Check HBA (High Beam Assist) system’ warning message will appear and warning light will illuminate on the cluster. Take your vehicle to an authorized HYUNDAI dealer and have the function checked.