Hyundai Elantra (CN7): 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.

❮In-car Sensor

Description and operation DescriptionThe In-car air temperature sensor is built in the heater & A/C control unit.The sensor contains a thermistor which measures the temperature of the inside.

Ambient Temperature Sensor❯

Description and operation DescriptionThe ambient temperature sensor is located at the front of the condenser and detects ambient air temperature. It is a negative type thermistor; resistance will increase with lower temperature, and decrease with higher temperature.

Other information:

Hyundai Elantra (CN7) 2021-2025 Service Manual: Components and components location

Hyundai Elantra (CN7) 2021-2025 Service Manual: Condenser