Hyundai Santa Fe (TM): Air conditioning System / Photo Sensor. Repair procedures

Inspection
1.
Emit intensive light toward the photo sensor using a lamp, and check the output voltage change.
2.
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.
Using a screwdriver or remover, remove the photo sensor (A).

3.
Press the lock pin, separate the photo sensor connector (A).

4.
Install in the reverse order of removal.

    Description The photo sensor is located at the center of the defrost nozzles. The photo sensor contains a photovoltaic (sensitive to sunlight) diode.

    Description The 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:

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    Hyundai Santa Fe (TM) 2019-2023 Service and Repair Manual: Compressor. Description and operation

    Description The compressor is the power unit of the A/C system. It is located on the side of engine block and driven by a V-belt of the engine. The compressor changes low pressure and low temperature refrigerant gas into high pressure and high temperature refrigerant gas.

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