Hyundai Palisade (LX2): Air conditioning System / Photo Sensor

Hyundai Palisade (LX2) 2020-2026 Service Manual / Heating,Ventilation And Air Conditioning / Air conditioning System / Photo Sensor

Description and operation

Description

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.

Hyundai Palisade. Repair procedures

[Dual photo]
1. Auto light ground
2. Auto light power (+5V)
3. Auto light signal (OUT)
4. Photo sensor_DRV (OUT)
5. Photo sensor power (+5V)
6. Photo sensor_Pass (OUT)

[Single photo]
1. Auto light ground
2. Auto light power (+5V)
3. Auto light signal (OUT)
4. Photo sensor signal (OUT)
5. Photo sensor power (+5V)
6. -

Replacement

1.	Disconnect the negative (-) battery terminal.

2.	Using a remover and remove the center speaker grill (A).

3.	Separate the photo sensor connector (A) and security sensor connector (B).

4.	Remove the photo sensor (A).

Install in the reverse order of removal.

•	Make sure the hood latch release cable is connected properly.

•	Replace any damaged clips (or retainers or fasteners).

❮In-car Sensor

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

Ambient Temperature Sensor❯

Description and operation Description The ambient temperature sensor is located at the front of the condenser and detects ambient air temperature.

Other information:

Hyundai Palisade (LX2) 2020-2026 Service Manual: A/C Pressure Transducer

Description and operation Description The A/C Pressure Transducer (APT) converts the pressure value of high pressure line into voltage value after measuring it. By converted voltage value, engine ECU controls the cooling fan by operating it high speed or low speed.

Hyundai Palisade (LX2) 2020-2026 Service Manual: Troubleshooting